2018-05-22 19:30:02 +00:00
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/*
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2019-01-09 20:22:17 +00:00
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* Copyright (c) 2015-2019 Sergey Bakhurin
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2018-05-22 19:30:02 +00:00
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* Digital Signal Processing Library [http://dsplib.org]
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*
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* This file is part of DSPL.
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2018-10-24 17:39:51 +00:00
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*
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2018-05-22 19:30:02 +00:00
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* is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* DSPL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2020-07-17 18:09:28 +00:00
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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2018-05-22 19:30:02 +00:00
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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2020-07-17 18:09:28 +00:00
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* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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2018-05-22 19:30:02 +00:00
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "dspl.h"
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2020-07-03 18:08:51 +00:00
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2020-07-17 18:09:28 +00:00
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#ifdef DOXYGEN_ENGLISH
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/*! ****************************************************************************
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\ingroup SPEC_MATH_ELLIP_GROUP
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\fn int ellip_acd(double* w, int n, double k, double* u)
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\brief Inverse Jacobi elliptic function \f$ u = \textrm{cd}^{-1}(w, k)\f$
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of the real vector argument
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Function calculates inverse Jacobi elliptic function
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\f$ u = \textrm{cd}^{-1}(w, k)\f$ of the real vector `w`. \n
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\param[in] w
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Pointer to the argument vector \f$ w \f$. \n
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Vector size is `[n x 1]`. \n
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Memory must be allocated. \n \n
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\param[in] n
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Size of vector `w`. \n
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\param[in] k
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Elliptical modulus \f$ k \f$. \n
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Elliptical modulus is real parameter,
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which values can be from 0 to 1. \n \n
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\param[out] u
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Pointer to the vector of inverse Jacobi elliptic function
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\f$ u = \textrm{cd}^{-1}(w, k)\f$. \n
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Vector size is `[n x 1]`. \n
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Memory must be allocated. \n \n
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\return
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`RES_OK` successful exit, else \ref ERROR_CODE_GROUP "error code". \n
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\author Sergey Bakhurin www.dsplib.org
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***************************************************************************** */
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#endif
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#ifdef DOXYGEN_RUSSIAN
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/*! ****************************************************************************
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\ingroup SPEC_MATH_ELLIP_GROUP
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\fn int ellip_acd(double* w, int n, double k, double* u)
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\brief Обратная эллиптическая функция Якоби
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\f$ u = \textrm{cd}^{-1}(w, k)\f$ вещественного аргумента
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Функция рассчитывает значения обратной эллиптической функции
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\f$ u = \textrm{cd}^{-1}(w, k)\f$ для вещественного вектора `w`. \n
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Для расчета используется итерационный алгоритм на основе преобразования
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Ландена. \n
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\param[in] w
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Указатель на массив вектора переменной \f$ w \f$. \n
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Размер вектора `[n x 1]`. \n
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Память должна быть выделена. \n \n
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\param[in] n
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Размер вектора `w`. \n
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\param[in] k Значение эллиптического модуля \f$ k \f$.
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Эллиптический модуль -- вещественный параметр,
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принимающий значения от 0 до 1. \n \n
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\param[out] u
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Указатель на вектор значений обратной эллиптической
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функции \f$ u = \textrm{cd}^{-1}(w, k)\f$. \n
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Размер вектора `[n x 1]`. \n
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Память должна быть выделена. \n \n
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\return
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`RES_OK` Расчет произведен успешно. \n
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В противном случае \ref ERROR_CODE_GROUP "код ошибки". \n
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\author Бахурин Сергей www.dsplib.org
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***************************************************************************** */
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#endif
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2018-05-22 19:30:02 +00:00
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int DSPL_API ellip_acd(double* w, int n, double k, double* u)
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{
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2020-07-17 18:09:28 +00:00
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double lnd[ELLIP_ITER], t;
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int i, m;
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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if(!u || !w)
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return ERROR_PTR;
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if(n<1)
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return ERROR_SIZE;
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if(k < 0.0 || k>= 1.0)
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return ERROR_ELLIP_MODULE;
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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ellip_landen(k,ELLIP_ITER, lnd);
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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for(m = 0; m < n; m++)
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2018-10-24 17:39:51 +00:00
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{
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2020-07-17 18:09:28 +00:00
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u[m] = w[m];
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for(i = 1; i < ELLIP_ITER; i++)
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{
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t = lnd[i-1]*u[m];
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t *= t;
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t = 1.0 + sqrt(1.0 - t);
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u[m] = 2.0 * u[m] / (t+t*lnd[i]);
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}
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u[m] = 2.0 * acos(u[m]) / M_PI;
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2018-10-24 17:39:51 +00:00
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}
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2020-07-17 18:09:28 +00:00
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return RES_OK;
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2018-05-22 19:30:02 +00:00
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}
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2020-07-03 18:08:51 +00:00
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2020-07-17 18:09:28 +00:00
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#ifdef DOXYGEN_ENGLISH
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/*! ****************************************************************************
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\ingroup SPEC_MATH_ELLIP_GROUP
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\fn int ellip_acd_cmplx(complex_t* w, int n, double k, complex_t* u)
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\brief Inverse Jacobi elliptic function \f$ u = \textrm{cd}^{-1}(w, k)\f$
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of complex vector argument
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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Function calculates inverse Jacobi elliptic function
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\f$ u = \textrm{cd}^{-1}(w, k)\f$ of complex vector `w`. \n
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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\param[in] w
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Pointer to the argument vector \f$ w \f$. \n
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Vector size is `[n x 1]`. \n
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Memory must be allocated. \n \n
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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\param[in] n
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Size of vector `w`. \n \n
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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\param[in] k
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Elliptical modulus \f$ k \f$. \n
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Elliptical modulus is real parameter,
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which values can be from 0 to 1. \n \n
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\param[out] u
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Pointer to the vector of inverse Jacobi elliptic function
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\f$ u = \textrm{cd}^{-1}(w, k)\f$. \n
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Vector size is `[n x 1]`. \n
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Memory must be allocated. \n \n
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\return
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`RES_OK` successful exit, else \ref ERROR_CODE_GROUP "error code". \n
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\author Sergey Bakhurin www.dsplib.org
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***************************************************************************** */
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#endif
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#ifdef DOXYGEN_RUSSIAN
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/*! ****************************************************************************
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\ingroup SPEC_MATH_ELLIP_GROUP
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\fn int ellip_acd_cmplx(complex_t* w, int n, double k, complex_t* u)
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\brief Обратная эллиптическая функция Якоби
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\f$ u = \textrm{cd}^{-1}(w, k)\f$ комплексного аргумента
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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Функция рассчитывает значения значения обратной эллиптической функции
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\f$ u = \textrm{cd}^{-1}(w, k)\f$ для комплексного вектора `w`. \n
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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Для расчета используется итерационный алгоритм на основе преобразования
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Ландена. \n
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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\param[in] w
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Указатель на массив вектора переменной \f$ w \f$. \n
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Размер вектора `[n x 1]`. \n
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Память должна быть выделена. \n \n
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\param[in] n
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Размер вектора `w`. \n \n
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\param[in] k
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Значение эллиптического модуля \f$ k \f$. \n
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Эллиптический модуль -- вещественный параметр,
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принимающий значения от 0 до 1. \n \n
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\param[out] u
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Указатель на вектор значений обратной эллиптической
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функции \f$ u = \textrm{cd}^{-1}(w, k)\f$. \n
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Размер вектора `[n x 1]`. \n
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Память должна быть выделена. \n \n
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\return
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`RES_OK` Расчет произведен успешно. \n
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В противном случае \ref ERROR_CODE_GROUP "код ошибки". \n
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\author Бахурин Сергей www.dsplib.org
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***************************************************************************** */
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#endif
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int DSPL_API ellip_acd_cmplx(complex_t* w, int n, double k, complex_t* u)
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{
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double lnd[ELLIP_ITER], t;
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complex_t tmp0, tmp1;
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int i, m;
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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if(!u || !w)
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return ERROR_PTR;
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if(n<1)
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return ERROR_SIZE;
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if(k < 0.0 || k>= 1.0)
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return ERROR_ELLIP_MODULE;
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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ellip_landen(k,ELLIP_ITER, lnd);
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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for(m = 0; m < n; m++)
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{
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RE(u[m]) = RE(w[m]);
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IM(u[m]) = IM(w[m]);
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for(i = 1; i < ELLIP_ITER; i++)
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{
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RE(tmp0) = lnd[i-1]*RE(u[m]);
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IM(tmp0) = lnd[i-1]*IM(u[m]);
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RE(tmp1) = 1.0 - CMRE(tmp0, tmp0);
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IM(tmp1) = - CMIM(tmp0, tmp0);
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sqrt_cmplx(&tmp1, 1, &tmp0);
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RE(tmp0) += 1.0;
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RE(tmp1) = RE(tmp0) * (1.0 + lnd[i]);
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IM(tmp1) = IM(tmp0) * (1.0 + lnd[i]);
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t = 2.0 / ABSSQR(tmp1);
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RE(tmp0) = t * CMCONJRE(u[m], tmp1);
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IM(tmp0) = t * CMCONJIM(u[m], tmp1);
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RE(u[m]) = RE(tmp0);
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IM(u[m]) = IM(tmp0);
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}
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acos_cmplx(&tmp0, 1, u+m);
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t = 2.0 / M_PI;
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RE(u[m]) *= t;
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IM(u[m]) *= t;
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2018-10-24 17:39:51 +00:00
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}
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2020-07-17 18:09:28 +00:00
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return RES_OK;
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2018-05-22 19:30:02 +00:00
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}
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2020-07-17 18:09:28 +00:00
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#ifdef DOXYGEN_ENGLISH
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/*! ****************************************************************************
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\ingroup SPEC_MATH_ELLIP_GROUP
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\fn int ellip_asn(double* w, int n, double k, double* u)
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\brief Inverse Jacobi elliptic function \f$ u = \textrm{sn}^{-1}(w, k)\f$
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of real vector argument
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Function calculates inverse Jacobi elliptic function
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\f$ u = \textrm{sn}^{-1}(w, k)\f$ of real vector `w`. \n
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\param[in] w
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Pointer to the argument vector \f$ w \f$. \n
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Vector size is `[n x 1]`. \n
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Memory must be allocated. \n \n
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\param[in] n
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Size of vector `w`. \n
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\param[in] k
|
|
|
|
|
Elliptical modulus \f$ k \f$. \n
|
|
|
|
|
Elliptical modulus is real parameter,
|
|
|
|
|
which values can be from 0 to 1. \n \n
|
|
|
|
|
|
|
|
|
|
\param[out] u
|
|
|
|
|
Pointer to the vector of inverse Jacobi elliptic function
|
|
|
|
|
\f$ u = \textrm{sn}^{-1}(w, k)\f$. \n
|
|
|
|
|
Vector size is `[n x 1]`. \n
|
|
|
|
|
Memory must be allocated. \n \n
|
|
|
|
|
|
|
|
|
|
\return
|
|
|
|
|
`RES_OK` successful exit, else \ref ERROR_CODE_GROUP "error code". \n
|
|
|
|
|
|
|
|
|
|
\author Sergey Bakhurin www.dsplib.org
|
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
|
|
|
|
#ifdef DOXYGEN_RUSSIAN
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_asn(double* w, int n, double k, double* u)
|
|
|
|
|
\brief Обратная эллиптическая функция Якоби
|
|
|
|
|
\f$ u = \textrm{sn}^{-1}(w, k)\f$ вещественного аргумента
|
|
|
|
|
|
|
|
|
|
Функция рассчитывает значения значения обратной эллиптической функции
|
|
|
|
|
\f$ u = \textrm{sn}^{-1}(w, k)\f$ для вещественного вектора `w`. \n
|
|
|
|
|
|
|
|
|
|
Для расчета используется итерационный алгоритм на основе преобразования
|
|
|
|
|
Ландена. \n
|
|
|
|
|
|
|
|
|
|
\param[in] w
|
|
|
|
|
Указатель на массив вектора переменной \f$ w \f$. \n
|
|
|
|
|
Размер вектора `[n x 1]`. \n
|
|
|
|
|
Память должна быть выделена. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] n
|
|
|
|
|
Размер вектора `w`. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] k
|
|
|
|
|
Значение эллиптического модуля \f$ k \f$. \n
|
|
|
|
|
Эллиптический модуль -- вещественный параметр,
|
|
|
|
|
принимающий значения от 0 до 1. \n \n
|
|
|
|
|
|
|
|
|
|
\param[out] u
|
|
|
|
|
Указатель на вектор значений обратной эллиптической
|
|
|
|
|
функции \f$ u = \textrm{sn}^{-1}(w, k)\f$. \n
|
|
|
|
|
Размер вектора `[n x 1]`. \n
|
|
|
|
|
Память должна быть выделена. \n \n
|
|
|
|
|
|
|
|
|
|
\return
|
|
|
|
|
`RES_OK` Расчет произведен успешно. \n
|
|
|
|
|
В противном случае \ref ERROR_CODE_GROUP "код ошибки". \n
|
|
|
|
|
|
|
|
|
|
\author
|
|
|
|
|
Бахурин Сергей
|
|
|
|
|
www.dsplib.org
|
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
2018-05-22 19:30:02 +00:00
|
|
|
|
int DSPL_API ellip_asn(double* w, int n, double k, double* u)
|
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
double lnd[ELLIP_ITER], t;
|
|
|
|
|
int i, m;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
if(!u || !w)
|
|
|
|
|
return ERROR_PTR;
|
|
|
|
|
if(n<1)
|
|
|
|
|
return ERROR_SIZE;
|
|
|
|
|
if(k < 0.0 || k>= 1.0)
|
|
|
|
|
return ERROR_ELLIP_MODULE;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
ellip_landen(k,ELLIP_ITER, lnd);
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
for(m = 0; m < n; m++)
|
2018-10-24 17:39:51 +00:00
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
u[m] = w[m];
|
|
|
|
|
for(i = 1; i < ELLIP_ITER; i++)
|
|
|
|
|
{
|
|
|
|
|
t = lnd[i-1]*u[m];
|
|
|
|
|
t *= t;
|
|
|
|
|
t = 1.0 + sqrt(1.0 - t);
|
|
|
|
|
u[m] = 2.0 * u[m] / (t+t*lnd[i]);
|
|
|
|
|
}
|
|
|
|
|
u[m] = 2.0 * asin(u[m]) / M_PI;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
}
|
2020-07-17 18:09:28 +00:00
|
|
|
|
return RES_OK;
|
2018-05-22 19:30:02 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
#ifdef DOXYGEN_ENGLISH
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_asn_cmplx(complex_t* w, int n, double k, complex_t* u)
|
|
|
|
|
\brief Inverse Jacobi elliptic function \f$ u = \textrm{sn}^{-1}(w, k)\f$
|
|
|
|
|
of complex vector argument
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
Function calculates inverse Jacobi elliptic function
|
|
|
|
|
\f$ u = \textrm{sn}^{-1}(w, k)\f$ of complex vector `w`. \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\param[in] w
|
|
|
|
|
Pointer to the argument vector \f$ w \f$. \n
|
|
|
|
|
Vector size is `[n x 1]`. \n
|
|
|
|
|
Memory must be allocated. \n \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\param[in] n
|
|
|
|
|
Size of vector `w`. \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\param[in] k
|
|
|
|
|
Elliptical modulus \f$ k \f$. \n
|
|
|
|
|
Elliptical modulus is real parameter,
|
|
|
|
|
which values can be from 0 to 1. \n \n
|
|
|
|
|
|
|
|
|
|
\param[out] u
|
|
|
|
|
Pointer to the vector of inverse Jacobi elliptic function
|
|
|
|
|
\f$ u = \textrm{sn}^{-1}(w, k)\f$. \n
|
|
|
|
|
Vector size is `[n x 1]`. \n
|
|
|
|
|
Memory must be allocated. \n \n
|
|
|
|
|
|
|
|
|
|
\return
|
|
|
|
|
`RES_OK` successful exit, else \ref ERROR_CODE_GROUP "error code". \n
|
|
|
|
|
|
|
|
|
|
\author Sergey Bakhurin www.dsplib.org
|
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
|
|
|
|
#ifdef DOXYGEN_RUSSIAN
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_asn_cmplx(complex_t* w, int n, double k, complex_t* u)
|
|
|
|
|
\brief Обратная эллиптическая функция Якоби
|
|
|
|
|
\f$ u = \textrm{sn}^{-1}(w, k)\f$ комплексного аргумента
|
|
|
|
|
|
|
|
|
|
Функция рассчитывает значения значения обратной эллиптической функции
|
|
|
|
|
\f$ u = \textrm{sn}^{-1}(w, k)\f$ для комплексного вектора `w`. \n
|
|
|
|
|
|
|
|
|
|
Для расчета используется итерационный алгоритм на основе преобразования
|
|
|
|
|
Ландена. \n
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
\param[in] w
|
|
|
|
|
Указатель на массив вектора переменной \f$ w \f$. \n
|
|
|
|
|
Размер вектора `[n x 1]`. \n
|
|
|
|
|
Память должна быть выделена. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] n
|
|
|
|
|
Размер вектора `w`. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] k
|
|
|
|
|
Значение эллиптического модуля \f$ k \f$. \n
|
|
|
|
|
Эллиптический модуль -- вещественный параметр,
|
|
|
|
|
принимающий значения от 0 до 1. \n \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\param[out] u
|
|
|
|
|
Указатель на вектор значений обратной эллиптической
|
|
|
|
|
функции \f$ u = \textrm{sn}^{-1}(w, k)\f$. \n
|
|
|
|
|
Размер вектора `[n x 1]`. \n
|
|
|
|
|
Память должна быть выделена. \n \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\return
|
|
|
|
|
`RES_OK`Расчет произведен успешно. \n
|
|
|
|
|
В противном случае \ref ERROR_CODE_GROUP "код ошибки". \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\author Бахурин Сергей www.dsplib.org
|
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
|
|
|
|
int DSPL_API ellip_asn_cmplx(complex_t* w, int n, double k, complex_t* u)
|
|
|
|
|
{
|
|
|
|
|
double lnd[ELLIP_ITER], t;
|
|
|
|
|
complex_t tmp0, tmp1;
|
|
|
|
|
int i, m;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
if(!u || !w)
|
|
|
|
|
return ERROR_PTR;
|
|
|
|
|
if(n<1)
|
|
|
|
|
return ERROR_SIZE;
|
|
|
|
|
if(k < 0.0 || k>= 1.0)
|
|
|
|
|
return ERROR_ELLIP_MODULE;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
ellip_landen(k,ELLIP_ITER, lnd);
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
for(m = 0; m < n; m++)
|
|
|
|
|
{
|
|
|
|
|
RE(u[m]) = RE(w[m]);
|
|
|
|
|
IM(u[m]) = IM(w[m]);
|
|
|
|
|
for(i = 1; i < ELLIP_ITER; i++)
|
|
|
|
|
{
|
|
|
|
|
RE(tmp0) = lnd[i-1]*RE(u[m]);
|
|
|
|
|
IM(tmp0) = lnd[i-1]*IM(u[m]);
|
|
|
|
|
RE(tmp1) = 1.0 - CMRE(tmp0, tmp0);
|
|
|
|
|
IM(tmp1) = - CMIM(tmp0, tmp0);
|
|
|
|
|
|
|
|
|
|
sqrt_cmplx(&tmp1, 1, &tmp0);
|
|
|
|
|
RE(tmp0) += 1.0;
|
|
|
|
|
|
|
|
|
|
RE(tmp1) = RE(tmp0) * (1.0 + lnd[i]);
|
|
|
|
|
IM(tmp1) = IM(tmp0) * (1.0 + lnd[i]);
|
|
|
|
|
|
|
|
|
|
t = 2.0 / ABSSQR(tmp1);
|
|
|
|
|
|
|
|
|
|
RE(tmp0) = t * CMCONJRE(u[m], tmp1);
|
|
|
|
|
IM(tmp0) = t * CMCONJIM(u[m], tmp1);
|
|
|
|
|
|
|
|
|
|
RE(u[m]) = RE(tmp0);
|
|
|
|
|
IM(u[m]) = IM(tmp0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
asin_cmplx(&tmp0, 1, u+m);
|
|
|
|
|
t = 2.0 / M_PI;
|
|
|
|
|
RE(u[m]) *= t;
|
|
|
|
|
IM(u[m]) *= t;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
}
|
2020-07-17 18:09:28 +00:00
|
|
|
|
return RES_OK;
|
2018-05-22 19:30:02 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
#ifdef DOXYGEN_ENGLISH
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_cd(double* u, int n, double k, double* y)
|
|
|
|
|
\brief Jacobi elliptic function \f$ y = \textrm{cd}(u K(k), k)\f$
|
|
|
|
|
of real vector argument
|
|
|
|
|
|
|
|
|
|
Function calculates Jacobi elliptic function
|
|
|
|
|
\f$ y = \textrm{cd}(u K(k), k)\f$ of real vector `u` and
|
|
|
|
|
elliptical modulus `k`. \n
|
|
|
|
|
|
|
|
|
|
\param[in] u
|
|
|
|
|
Pointer to the argument vector \f$ u \f$. \n
|
|
|
|
|
Vector size is `[n x 1]`. \n
|
|
|
|
|
Memory must be allocated. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] n
|
|
|
|
|
Size of vector `u`. \n
|
|
|
|
|
|
|
|
|
|
\param[in] k
|
|
|
|
|
Elliptical modulus \f$ k \f$. \n
|
|
|
|
|
Elliptical modulus is real parameter,
|
|
|
|
|
which values can be from 0 to 1. \n \n
|
|
|
|
|
|
|
|
|
|
\param[out] y
|
|
|
|
|
Pointer to the vector of Jacobi elliptic function
|
|
|
|
|
\f$ y = \textrm{cd}(u K(k), k)\f$. \n
|
|
|
|
|
Vector size is `[n x 1]`. \n
|
|
|
|
|
Memory must be allocated. \n \n
|
|
|
|
|
|
|
|
|
|
\return
|
|
|
|
|
`RES_OK` successful exit, else \ref ERROR_CODE_GROUP "error code". \n
|
|
|
|
|
|
2020-10-02 20:20:49 +00:00
|
|
|
|
Example
|
|
|
|
|
\include ellip_cd_test.c
|
|
|
|
|
|
|
|
|
|
The program calculates two periods of the \f$ y = \textrm{cd}(u K(k), k)\f$
|
|
|
|
|
function for different modulus values `k = 0`, `k= 0.9` и `k = 0.99`.
|
|
|
|
|
Also program draws the plot of calculated elliptic functions.
|
|
|
|
|
|
|
|
|
|
\image html ellip_cd.png
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\author Sergey Bakhurin www.dsplib.org
|
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
|
|
|
|
#ifdef DOXYGEN_RUSSIAN
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_cd(double* u, int n, double k, double* y)
|
|
|
|
|
\brief Эллиптическая функция Якоби
|
|
|
|
|
\f$ y = \textrm{cd}(u K(k), k)\f$ вещественного аргумента
|
|
|
|
|
|
|
|
|
|
Функция рассчитывает значения значения эллиптической функции
|
|
|
|
|
\f$ y = \textrm{cd}(u K(k), k)\f$ для вещественного вектора `u` и
|
|
|
|
|
эллиптического модуля `k`. \n
|
|
|
|
|
|
|
|
|
|
Для расчета используется итерационный алгоритм на основе преобразования
|
|
|
|
|
Ландена. \n
|
|
|
|
|
|
|
|
|
|
\param[in] u
|
|
|
|
|
Указатель на массив вектора переменной \f$ u \f$. \n
|
|
|
|
|
Размер вектора `[n x 1]`. \n
|
|
|
|
|
Память должна быть выделена. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] n
|
|
|
|
|
Размер вектора `u`. \n \n
|
|
|
|
|
|
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|
|
|
\param[in] k
|
|
|
|
|
Значение эллиптического модуля \f$ k \f$. \n
|
|
|
|
|
Эллиптический модуль -- вещественный параметр,
|
|
|
|
|
принимающий значения от 0 до 1. \n \n
|
|
|
|
|
|
|
|
|
|
\param[out] y
|
|
|
|
|
Указатель на вектор значений эллиптической
|
|
|
|
|
функции \f$ y = \textrm{cd}(u K(k), k)\f$. \n
|
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|
|
Размер вектора `[n x 1]`. \n
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|
Память должна быть выделена. \n \n
|
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|
\return
|
|
|
|
|
`RES_OK` Расчет произведен успешно. \n
|
|
|
|
|
В противном случае \ref ERROR_CODE_GROUP "код ошибки". \n
|
|
|
|
|
|
2020-10-02 20:20:49 +00:00
|
|
|
|
Пример представлен в следующем листинге:
|
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|
|
|
\include ellip_cd_test.c
|
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|
|
Программа рассчитывает два периода эллиптической функции
|
|
|
|
|
\f$ y = \textrm{cd}(u K(k), k)\f$ для `k = 0`, `k= 0.9` и `k = 0.99`,
|
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|
|
|
а также выводит графики данных функций
|
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|
|
\image html ellip_cd.png
|
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|
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|
|
\author Бахурин Сергей www.dsplib.org
|
2020-07-17 18:09:28 +00:00
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
2018-05-22 19:30:02 +00:00
|
|
|
|
int DSPL_API ellip_cd(double* u, int n, double k, double* y)
|
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
double lnd[ELLIP_ITER];
|
|
|
|
|
int i, m;
|
2018-10-24 17:39:51 +00:00
|
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|
|
|
2020-07-17 18:09:28 +00:00
|
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|
|
if(!u || !y)
|
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|
|
return ERROR_PTR;
|
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|
|
|
if(n<1)
|
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|
|
|
return ERROR_SIZE;
|
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|
|
|
if(k < 0.0 || k>= 1.0)
|
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|
|
|
return ERROR_ELLIP_MODULE;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
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|
|
ellip_landen(k,ELLIP_ITER, lnd);
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
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|
|
for(m = 0; m < n; m++)
|
2018-10-24 17:39:51 +00:00
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
y[m] = cos(u[m] * M_PI * 0.5);
|
|
|
|
|
for(i = ELLIP_ITER-1; i>0; i--)
|
|
|
|
|
{
|
|
|
|
|
y[m] = (1.0 + lnd[i]) / (1.0 / y[m] + lnd[i]*y[m]);
|
|
|
|
|
}
|
2018-10-24 17:39:51 +00:00
|
|
|
|
}
|
2020-07-17 18:09:28 +00:00
|
|
|
|
return RES_OK;
|
2018-05-22 19:30:02 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
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|
|
2019-10-13 14:19:50 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
#ifdef DOXYGEN_ENGLISH
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_cd_cmplx(complex_t* u, int n, double k, complex_t* y)
|
|
|
|
|
\brief Jacobi elliptic function \f$ y = \textrm{cd}(u K(k), k)\f$
|
|
|
|
|
of complex vector argument
|
|
|
|
|
|
|
|
|
|
Function calculates Jacobi elliptic function
|
|
|
|
|
\f$ y = \textrm{cd}(u K(k), k)\f$ of complex vector `u` and
|
|
|
|
|
elliptical modulus `k`. \n
|
|
|
|
|
|
|
|
|
|
\param[in] u
|
|
|
|
|
Pointer to the argument vector \f$ u \f$. \n
|
|
|
|
|
Vector size is `[n x 1]`. \n
|
|
|
|
|
Memory must be allocated. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] n
|
|
|
|
|
Size of vector `u`. \n
|
|
|
|
|
|
|
|
|
|
\param[in] k
|
|
|
|
|
Elliptical modulus \f$ k \f$. \n
|
|
|
|
|
Elliptical modulus is real parameter,
|
|
|
|
|
which values can be from 0 to 1. \n \n
|
|
|
|
|
|
|
|
|
|
\param[out] y
|
|
|
|
|
Pointer to the vector of Jacobi elliptic function
|
|
|
|
|
\f$ y = \textrm{cd}(u K(k), k)\f$. \n
|
|
|
|
|
Vector size is `[n x 1]`. \n
|
|
|
|
|
Memory must be allocated. \n \n
|
|
|
|
|
|
|
|
|
|
\return
|
|
|
|
|
`RES_OK` successful exit, else \ref ERROR_CODE_GROUP "error code". \n
|
|
|
|
|
|
|
|
|
|
\author Sergey Bakhurin www.dsplib.org
|
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
|
|
|
|
#ifdef DOXYGEN_RUSSIAN
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_cd_cmplx(complex_t* u, int n, double k, complex_t* y)
|
|
|
|
|
\brief Эллиптическая функция Якоби
|
|
|
|
|
\f$ y = \textrm{cd}(u K(k), k)\f$ комплексного аргумента
|
|
|
|
|
|
|
|
|
|
Функция рассчитывает значения значения эллиптической функции
|
|
|
|
|
\f$ y = \textrm{cd}(u K(k), k)\f$ для комплексного вектора `u` и
|
|
|
|
|
эллиптического модуля `k`. \n
|
|
|
|
|
|
|
|
|
|
Для расчета используется итерационный алгоритм на основе преобразования
|
|
|
|
|
Ландена. \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\param[in] u
|
|
|
|
|
Указатель на массив вектора переменной \f$ u \f$. \n
|
|
|
|
|
Размер вектора `[n x 1]`. \n
|
|
|
|
|
Память должна быть выделена. \n \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\param[in] n
|
|
|
|
|
Размер вектора `u`. \n \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\param[in] k
|
|
|
|
|
Значение эллиптического модуля \f$ k \f$. \n
|
|
|
|
|
Эллиптический модуль -- вещественный параметр,
|
|
|
|
|
принимающий значения от 0 до 1. \n \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\param[out] y
|
|
|
|
|
Указатель на вектор значений эллиптической
|
|
|
|
|
функции \f$ y = \textrm{cd}(u K(k), k)\f$. \n
|
|
|
|
|
Размер вектора `[n x 1]`. \n
|
|
|
|
|
Память должна быть выделена. \n \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\return
|
|
|
|
|
`RES_OK` Расчет произведен успешно. \n
|
|
|
|
|
В противном случае \ref ERROR_CODE_GROUP "код ошибки". \n
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\author Бахурин Сергей www.dsplib.org
|
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
|
|
|
|
int DSPL_API ellip_cd_cmplx(complex_t* u, int n, double k, complex_t* y)
|
|
|
|
|
{
|
|
|
|
|
double lnd[ELLIP_ITER], t;
|
|
|
|
|
int i, m;
|
|
|
|
|
complex_t tmp;
|
|
|
|
|
|
|
|
|
|
if(!u || !y)
|
|
|
|
|
return ERROR_PTR;
|
|
|
|
|
if(n<1)
|
|
|
|
|
return ERROR_SIZE;
|
|
|
|
|
if(k < 0.0 || k>= 1.0)
|
|
|
|
|
return ERROR_ELLIP_MODULE;
|
|
|
|
|
|
|
|
|
|
ellip_landen(k,ELLIP_ITER, lnd);
|
|
|
|
|
|
|
|
|
|
for(m = 0; m < n; m++)
|
2018-10-24 17:39:51 +00:00
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
RE(tmp) = RE(u[m]) * M_PI * 0.5;
|
|
|
|
|
IM(tmp) = IM(u[m]) * M_PI * 0.5;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
cos_cmplx(&tmp, 1, y+m);
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
for(i = ELLIP_ITER-1; i>0; i--)
|
|
|
|
|
{
|
|
|
|
|
t = 1.0 / ABSSQR(y[m]);
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
RE(tmp) = RE(y[m]) * t + RE(y[m]) * lnd[i];
|
|
|
|
|
IM(tmp) = -IM(y[m]) * t + IM(y[m]) * lnd[i];
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
t = (1.0 + lnd[i]) / ABSSQR(tmp);
|
|
|
|
|
|
|
|
|
|
RE(y[m]) = RE(tmp) * t;
|
|
|
|
|
IM(y[m]) = -IM(tmp) * t;
|
|
|
|
|
}
|
2018-10-24 17:39:51 +00:00
|
|
|
|
}
|
2020-07-17 18:09:28 +00:00
|
|
|
|
return RES_OK;
|
2018-05-22 19:30:02 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
#ifdef DOXYGEN_ENGLISH
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_landen(double k, int n, double* y)
|
|
|
|
|
\brief Function calculates complete elliptical integral
|
|
|
|
|
coefficients \f$ k_i \f$
|
|
|
|
|
|
|
|
|
|
Complete elliptical integral \f$ K(k) \f$ can be described as:
|
|
|
|
|
|
|
|
|
|
\f[
|
|
|
|
|
K(k) = \frac{\pi}{2} \prod_{i = 1}^{\infty}(1+k_i),
|
|
|
|
|
\f]
|
|
|
|
|
|
|
|
|
|
here \f$ k_i \f$ -- coefficients which calculated
|
|
|
|
|
iterative from \f$ k_0 = k\f$:
|
|
|
|
|
|
|
|
|
|
\f[
|
|
|
|
|
k_i = \left( \frac{k_{i-1}}{1+\sqrt{1-k_{i-1}^2}}\right)^2
|
|
|
|
|
\f]
|
|
|
|
|
|
|
|
|
|
This function calculates `n` fist coefficients \f$ k_i \f$, which can
|
|
|
|
|
be used for Complete elliptical integral.
|
|
|
|
|
|
|
|
|
|
\param[in] k
|
|
|
|
|
Elliptical modulus \f$ k \f$. \n
|
|
|
|
|
Elliptical modulus is real parameter, which values can be from 0 to 1. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] n
|
|
|
|
|
Number of \f$ k_i \f$ which need to calculate. \n
|
|
|
|
|
Parameter `n` is size of output vector `y`. \n
|
|
|
|
|
|
|
|
|
|
\param[out] y
|
|
|
|
|
pointer to the real vector which keep \f$ k_i \f$. \n
|
|
|
|
|
Vector size is `[n x 1]`. \n
|
|
|
|
|
Memory must be allocated. \n \n
|
|
|
|
|
|
|
|
|
|
\return
|
|
|
|
|
`RES_OK` -- successful exit, else \ref ERROR_CODE_GROUP "error code". \n
|
|
|
|
|
|
|
|
|
|
Example:
|
|
|
|
|
|
|
|
|
|
\include ellip_landen_test.c
|
|
|
|
|
|
|
|
|
|
Result:
|
|
|
|
|
|
|
|
|
|
\verbatim
|
|
|
|
|
i k[i]
|
|
|
|
|
|
|
|
|
|
1 4.625e-01
|
|
|
|
|
2 6.009e-02
|
|
|
|
|
3 9.042e-04
|
|
|
|
|
4 2.044e-07
|
|
|
|
|
5 1.044e-14
|
|
|
|
|
6 2.727e-29
|
|
|
|
|
7 1.859e-58
|
|
|
|
|
8 8.640e-117
|
|
|
|
|
9 1.866e-233
|
|
|
|
|
10 0.000e+00
|
|
|
|
|
11 0.000e+00
|
|
|
|
|
12 0.000e+00
|
|
|
|
|
13 0.000e+00
|
|
|
|
|
\endverbatim
|
|
|
|
|
|
|
|
|
|
\note Complete elliptical integral converges enough fast
|
|
|
|
|
if modulus \f$ k<1 \f$. There are 10 to 20 coefficients \f$ k_i \f$
|
|
|
|
|
are sufficient for practical applications
|
|
|
|
|
to ensure complete elliptic integral precision within EPS.
|
|
|
|
|
|
|
|
|
|
\author Sergey Bakhurin www.dsplib.org
|
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
|
|
|
|
#ifdef DOXYGEN_RUSSIAN
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_landen(double k, int n, double* y)
|
|
|
|
|
\brief Расчет коэффициентов \f$ k_i \f$ ряда полного эллиптического интеграла.
|
|
|
|
|
|
|
|
|
|
Полный эллиптический интеграл \f$ K(k) \f$ может быть представлен рядом:
|
|
|
|
|
|
|
|
|
|
\f[
|
|
|
|
|
K(k) = \frac{\pi}{2} \prod_{i = 1}^{\infty}(1+k_i),
|
|
|
|
|
\f]
|
|
|
|
|
|
|
|
|
|
где \f$ k_i \f$ вычисляется итерационно при начальных условиях \f$ k_0 = k\f$:
|
|
|
|
|
|
|
|
|
|
\f[
|
|
|
|
|
k_i = \left( \frac{k_{i-1}}{1+\sqrt{1-k_{i-1}^2}}\right)^2
|
|
|
|
|
\f]
|
|
|
|
|
|
|
|
|
|
Данная функция рассчитывает ряд первых `n` значений \f$ k_i \f$, которые в
|
|
|
|
|
дальнейшем могут быть использованы для расчета эллиптического интеграла и
|
|
|
|
|
эллиптических функций.
|
|
|
|
|
|
|
|
|
|
\param[in] k
|
|
|
|
|
Эллиптический модуль \f$ k \f$. \n
|
|
|
|
|
|
|
|
|
|
\param[in] n
|
|
|
|
|
Размер вектора `y` соответствующих коэффициентам \f$ k_i \f$. \n \n
|
|
|
|
|
|
|
|
|
|
\param[out] y
|
|
|
|
|
Указатель на вектор значений коэффициентов \f$ k_i \f$. \n
|
|
|
|
|
Размер вектора `[n x 1]`. \n
|
|
|
|
|
Память должна быть выделена. \n \n
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
\return
|
|
|
|
|
`RES_OK` Расчет произведен успешно. \n
|
|
|
|
|
В противном случае \ref ERROR_CODE_GROUP "код ошибки". \n
|
|
|
|
|
|
|
|
|
|
Пример использования функции `ellip_landen`:
|
|
|
|
|
|
|
|
|
|
\include ellip_landen_test.c
|
|
|
|
|
|
|
|
|
|
Результат работы программы:
|
|
|
|
|
|
|
|
|
|
\verbatim
|
|
|
|
|
i k[i]
|
|
|
|
|
|
|
|
|
|
1 4.625e-01
|
|
|
|
|
2 6.009e-02
|
|
|
|
|
3 9.042e-04
|
|
|
|
|
4 2.044e-07
|
|
|
|
|
5 1.044e-14
|
|
|
|
|
6 2.727e-29
|
|
|
|
|
7 1.859e-58
|
|
|
|
|
8 8.640e-117
|
|
|
|
|
9 1.866e-233
|
|
|
|
|
10 0.000e+00
|
|
|
|
|
11 0.000e+00
|
|
|
|
|
12 0.000e+00
|
|
|
|
|
13 0.000e+00
|
|
|
|
|
\endverbatim
|
|
|
|
|
|
|
|
|
|
\note
|
|
|
|
|
Ряд полного эллиптического интеграла сходится при значениях
|
|
|
|
|
эллиптического модуля \f$ k<1 \f$. При этом сходимость ряда достаточно
|
|
|
|
|
быстрая и для практический приложений достаточно от 10 до 20 значений
|
|
|
|
|
\f$ k_i \f$ для обеспечения погрешности при расчете полного
|
|
|
|
|
эллиптического интеграла в пределах машинной точности.
|
|
|
|
|
|
|
|
|
|
\author
|
|
|
|
|
Бахурин Сергей
|
|
|
|
|
www.dsplib.org
|
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
2018-05-22 19:30:02 +00:00
|
|
|
|
int DSPL_API ellip_landen(double k, int n, double* y)
|
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
int i;
|
|
|
|
|
y[0] = k;
|
|
|
|
|
|
|
|
|
|
if(!y)
|
|
|
|
|
return ERROR_PTR;
|
|
|
|
|
if(n < 1)
|
|
|
|
|
return ERROR_SIZE;
|
|
|
|
|
if(k < 0.0 || k>= 1.0)
|
|
|
|
|
return ERROR_ELLIP_MODULE;
|
|
|
|
|
|
|
|
|
|
for(i = 1; i < n; i++)
|
|
|
|
|
{
|
|
|
|
|
y[i] = y[i-1] / (1.0 + sqrt(1.0 - y[i-1] * y[i-1]));
|
|
|
|
|
y[i] *= y[i];
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return RES_OK;
|
2018-05-22 19:30:02 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
#ifdef DOXYGEN_ENGLISH
|
|
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
#ifdef DOXYGEN_RUSSIAN
|
|
|
|
|
|
|
|
|
|
#endif
|
2018-05-22 19:30:02 +00:00
|
|
|
|
int DSPL_API ellip_modulareq(double rp, double rs, int ord, double *k)
|
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
double ep, es, ke, kp, t, sn = 0.0;
|
|
|
|
|
int i, L, r;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
if(rp < 0 || rp == 0)
|
|
|
|
|
return ERROR_FILTER_RP;
|
|
|
|
|
if(rs < 0 || rs == 0)
|
|
|
|
|
return ERROR_FILTER_RS;
|
|
|
|
|
if(ord < 1)
|
|
|
|
|
return ERROR_FILTER_ORD;
|
|
|
|
|
if(!k)
|
|
|
|
|
return ERROR_PTR;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
ep = sqrt(pow(10.0, rp*0.1)-1.0);
|
|
|
|
|
es = sqrt(pow(10.0, rs*0.1)-1.0);
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
ke = ep/es;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
ke = sqrt(1.0 - ke*ke);
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
r = ord % 2;
|
|
|
|
|
L = (ord-r)/2;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
kp = 1.0;
|
|
|
|
|
for(i = 0; i < L; i++)
|
|
|
|
|
{
|
|
|
|
|
t = (double)(2*i+1) / (double)ord;
|
|
|
|
|
ellip_sn(&t, 1, ke, &sn);
|
|
|
|
|
sn*=sn;
|
|
|
|
|
kp *= sn*sn;
|
|
|
|
|
}
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
kp *= pow(ke, (double)ord);
|
|
|
|
|
*k = sqrt(1.0 - kp*kp);
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
return RES_OK;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2018-05-22 19:30:02 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
#ifdef DOXYGEN_ENGLISH
|
|
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
#ifdef DOXYGEN_RUSSIAN
|
2020-07-03 18:08:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
#endif
|
2018-05-22 19:30:02 +00:00
|
|
|
|
int DSPL_API ellip_rat(double* w, int n, int ord, double k, double* u)
|
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
double t, xi, w2, xi2, k2;
|
|
|
|
|
int i, m, r, L;
|
|
|
|
|
|
|
|
|
|
if(!u || !w)
|
|
|
|
|
return ERROR_PTR;
|
|
|
|
|
if(n<1)
|
|
|
|
|
return ERROR_SIZE;
|
|
|
|
|
if(k < 0.0 || k>= 1.0)
|
|
|
|
|
return ERROR_ELLIP_MODULE;
|
|
|
|
|
|
|
|
|
|
r = ord%2;
|
|
|
|
|
L = (ord-r)/2;
|
|
|
|
|
|
|
|
|
|
if(r)
|
|
|
|
|
memcpy(u, w, n*sizeof(double));
|
|
|
|
|
else
|
2018-10-24 17:39:51 +00:00
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
for(m = 0; m < n; m++)
|
|
|
|
|
{
|
|
|
|
|
u[m] = 1.0;
|
|
|
|
|
}
|
2018-10-24 17:39:51 +00:00
|
|
|
|
}
|
2020-07-17 18:09:28 +00:00
|
|
|
|
|
|
|
|
|
k2 = k*k;
|
|
|
|
|
for(i = 0; i < L; i++)
|
2018-10-24 17:39:51 +00:00
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
t = (double)(2*i+1) / (double)ord;
|
|
|
|
|
ellip_cd(&t, 1, k, &xi);
|
|
|
|
|
xi2 = xi*xi;
|
|
|
|
|
for(m = 0; m < n; m++)
|
|
|
|
|
{
|
|
|
|
|
w2 = w[m]*w[m];
|
|
|
|
|
u[m] *= (w2 - xi2) / (1.0 - w2 * k2 * xi2);
|
|
|
|
|
u[m] *= (1.0 - k2*xi2) / (1.0 - xi2);
|
|
|
|
|
}
|
2018-10-24 17:39:51 +00:00
|
|
|
|
}
|
2020-07-17 18:09:28 +00:00
|
|
|
|
return RES_OK;
|
2018-05-22 19:30:02 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
#ifdef DOXYGEN_ENGLISH
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_sn(double* u, int n, double k, double* y)
|
|
|
|
|
\brief Jacobi elliptic function \f$ y = \textrm{sn}(u K(k), k)\f$
|
|
|
|
|
of real vector argument
|
|
|
|
|
|
|
|
|
|
Function calculates Jacobi elliptic function
|
|
|
|
|
\f$ y = \textrm{sn}(u K(k), k)\f$ of real vector `u` and
|
|
|
|
|
elliptical modulus `k`. \n
|
|
|
|
|
|
|
|
|
|
\param[in] u
|
|
|
|
|
Pointer to the argument vector \f$ u \f$. \n
|
|
|
|
|
Vector size is `[n x 1]`. \n
|
|
|
|
|
Memory must be allocated. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] n
|
|
|
|
|
Size of vector `u`. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] k
|
|
|
|
|
Elliptical modulus \f$ k \f$. \n
|
|
|
|
|
Elliptical modulus is real parameter,
|
|
|
|
|
which values can be from 0 to 1. \n \n
|
|
|
|
|
|
|
|
|
|
\param[out] y
|
|
|
|
|
Pointer to the vector of Jacobi elliptic function
|
|
|
|
|
\f$ y = \textrm{sn}(u K(k), k)\f$. \n
|
|
|
|
|
Vector size is `[n x 1]`. \n
|
|
|
|
|
Memory must be allocated. \n \n
|
|
|
|
|
|
|
|
|
|
\return
|
|
|
|
|
`RES_OK` successful exit, else \ref ERROR_CODE_GROUP "error code". \n
|
|
|
|
|
|
2020-10-02 20:20:49 +00:00
|
|
|
|
Example
|
|
|
|
|
\include ellip_sn_test.c
|
|
|
|
|
|
|
|
|
|
The program calculates two periods of the \f$ y = \textrm{sn}(u K(k), k)\f$
|
|
|
|
|
function for different modulus values `k = 0`, `k= 0.9` и `k = 0.99`.
|
|
|
|
|
Also program draws the plot of calculated elliptic functions.
|
|
|
|
|
|
|
|
|
|
\image html ellip_sn.png
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\author Sergey Bakhurin www.dsplib.org
|
|
|
|
|
**************************************************************************** */
|
|
|
|
|
#endif
|
|
|
|
|
#ifdef DOXYGEN_RUSSIAN
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
|
|
\fn int ellip_sn(double* u, int n, double k, double* y)
|
|
|
|
|
\brief Эллиптическая функция Якоби
|
|
|
|
|
\f$ y = \textrm{sn}(u K(k), k)\f$ вещественного аргумента
|
|
|
|
|
|
|
|
|
|
Функция рассчитывает значения значения эллиптической функции
|
|
|
|
|
\f$ y = \textrm{sn}(u K(k), k)\f$ для вещественного вектора `u` и
|
|
|
|
|
эллиптического модуля `k`. \n
|
|
|
|
|
|
|
|
|
|
Для расчета используется итерационный алгоритм на основе преобразования
|
|
|
|
|
Ландена. \n
|
|
|
|
|
|
|
|
|
|
\param[in] u
|
|
|
|
|
Указатель на массив вектора переменной \f$ u \f$. \n
|
|
|
|
|
Размер вектора `[n x 1]`. \n
|
|
|
|
|
Память должна быть выделена. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] n
|
|
|
|
|
Размер вектора `u`. \n \n
|
|
|
|
|
|
|
|
|
|
\param[in] k
|
|
|
|
|
Значение эллиптического модуля \f$ k \f$. \n
|
|
|
|
|
Эллиптический модуль -- вещественный параметр,
|
|
|
|
|
принимающий значения от 0 до 1. \n \n
|
|
|
|
|
|
|
|
|
|
\param[out] y
|
|
|
|
|
Указатель на вектор значений эллиптической
|
|
|
|
|
функции \f$ y = \textrm{sn}(u K(k), k)\f$. \n
|
|
|
|
|
Размер вектора `[n x 1]`. \n
|
|
|
|
|
Память должна быть выделена. \n \n
|
|
|
|
|
|
|
|
|
|
\return
|
|
|
|
|
`RES_OK` Расчет произведен успешно. \n
|
|
|
|
|
В противном случае \ref ERROR_CODE_GROUP "код ошибки". \n
|
|
|
|
|
|
2020-10-02 20:20:49 +00:00
|
|
|
|
|
|
|
|
|
Пример представлен в следующем листинге:
|
|
|
|
|
|
|
|
|
|
\include ellip_sn_test.c
|
|
|
|
|
|
|
|
|
|
Программа рассчитывает два периода эллиптической функции
|
|
|
|
|
\f$ y = \textrm{sn}(u K(k), k)\f$ для `k = 0`, `k= 0.9` и `k = 0.99`,
|
|
|
|
|
а также выводит графики данных функций
|
|
|
|
|
|
|
|
|
|
\image html ellip_sn.png
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
\author Бахурин Сергей www.dsplib.org
|
|
|
|
|
***************************************************************************** */
|
|
|
|
|
#endif
|
2018-05-22 19:30:02 +00:00
|
|
|
|
int DSPL_API ellip_sn(double* u, int n, double k, double* y)
|
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
double lnd[ELLIP_ITER];
|
|
|
|
|
int i, m;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
if(!u || !y)
|
|
|
|
|
return ERROR_PTR;
|
|
|
|
|
if(n<1)
|
|
|
|
|
return ERROR_SIZE;
|
|
|
|
|
if(k < 0.0 || k>= 1.0)
|
|
|
|
|
return ERROR_ELLIP_MODULE;
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
ellip_landen(k,ELLIP_ITER, lnd);
|
2018-10-24 17:39:51 +00:00
|
|
|
|
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
for(m = 0; m < n; m++)
|
2018-10-24 17:39:51 +00:00
|
|
|
|
{
|
2020-07-17 18:09:28 +00:00
|
|
|
|
y[m] = sin(u[m] * M_PI * 0.5);
|
|
|
|
|
for(i = ELLIP_ITER-1; i>0; i--)
|
|
|
|
|
{
|
|
|
|
|
y[m] = (1.0 + lnd[i]) / (1.0 / y[m] + lnd[i]*y[m]);
|
|
|
|
|
}
|
2018-10-24 17:39:51 +00:00
|
|
|
|
}
|
2020-07-17 18:09:28 +00:00
|
|
|
|
return RES_OK;
|
2018-05-22 19:30:02 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
2019-10-13 14:19:50 +00:00
|
|
|
|
|
|
|
|
|
|
2020-07-17 18:09:28 +00:00
|
|
|
|
#ifdef DOXYGEN_ENGLISH
|
|
|
|
|
/*! ****************************************************************************
|
|
|
|
|
\ingroup SPEC_MATH_ELLIP_GROUP
|
|
|
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\fn int ellip_sn_cmplx(complex_t* u, int n, double k, complex_t* y)
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\brief Jacobi elliptic function \f$ y = \textrm{sn}(u K(k), k)\f$ of
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complex vector argument
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Function calculates Jacobi elliptic function
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\f$ y = \textrm{sn}(u K(k), k)\f$ of complex vector `u` and
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elliptical modulus `k`. \n
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\param[in] u
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Pointer to the argument vector \f$ u \f$. \n
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Vector size is `[n x 1]`. \n
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Memory must be allocated. \n \n
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\param[in] n
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Size of vector `u`. \n
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\param[in] k
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Elliptical modulus \f$ k \f$. \n
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Elliptical modulus is real parameter,
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which values can be from 0 to 1. \n \n
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\param[out] y
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Pointer to the vector of Jacobi elliptic function
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\f$ y = \textrm{sn}(u K(k), k)\f$. \n
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Vector size is `[n x 1]`. \n
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Memory must be allocated. \n \n
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\return
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`RES_OK` successful exit, else \ref ERROR_CODE_GROUP "error code". \n
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\author Sergey Bakhurin www.dsplib.org
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***************************************************************************** */
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#endif
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#ifdef DOXYGEN_RUSSIAN
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/*! ****************************************************************************
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\ingroup SPEC_MATH_ELLIP_GROUP
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\fn int ellip_sn_cmplx(complex_t* u, int n, double k, complex_t* y)
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\brief Эллиптическая функция Якоби
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\f$ y = \textrm{sn}(u K(k), k)\f$ комплексного аргумента
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Функция рассчитывает значения значения эллиптической функции
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\f$ y = \textrm{sn}(u K(k), k)\f$ для комплексного вектора `u` и
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эллиптического модуля `k`. \n
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Для расчета используется итерационный алгоритм на основе преобразования
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Ландена. \n
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\param[in] u
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Указатель на массив вектора переменной \f$ u \f$. \n
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Размер вектора `[n x 1]`. \n
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Память должна быть выделена. \n \n
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\param[in] n
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Размер вектора `u`. \n \n
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\param[in] k
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Значение эллиптического модуля \f$ k \f$. \n
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Эллиптический модуль -- вещественный параметр,
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принимающий значения от 0 до 1. \n \n
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\param[out] y
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Указатель на вектор значений эллиптической
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функции \f$ y = \textrm{sn}(u K(k), k)\f$. \n
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Размер вектора `[n x 1]`. \n
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Память должна быть выделена. \n \n
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\return
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`RES_OK` Расчет произведен успешно. \n
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В противном случае \ref ERROR_CODE_GROUP "код ошибки". \n
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\author Бахурин Сергей www.dsplib.org
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***************************************************************************** */
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#endif
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2018-05-22 19:30:02 +00:00
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int DSPL_API ellip_sn_cmplx(complex_t* u, int n, double k, complex_t* y)
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{
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2020-07-17 18:09:28 +00:00
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double lnd[ELLIP_ITER], t;
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int i, m;
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complex_t tmp;
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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if(!u || !y)
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return ERROR_PTR;
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if(n<1)
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return ERROR_SIZE;
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if(k < 0.0 || k>= 1.0)
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return ERROR_ELLIP_MODULE;
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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ellip_landen(k,ELLIP_ITER, lnd);
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2018-05-22 19:30:02 +00:00
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2020-07-17 18:09:28 +00:00
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for(m = 0; m < n; m++)
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{
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RE(tmp) = RE(u[m]) * M_PI * 0.5;
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IM(tmp) = IM(u[m]) * M_PI * 0.5;
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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sin_cmplx(&tmp, 1, y+m);
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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for(i = ELLIP_ITER-1; i>0; i--)
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{
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t = 1.0 / ABSSQR(y[m]);
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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RE(tmp) = RE(y[m]) * t + RE(y[m]) * lnd[i];
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IM(tmp) = -IM(y[m]) * t + IM(y[m]) * lnd[i];
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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t = (1.0 + lnd[i]) / ABSSQR(tmp);
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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RE(y[m]) = RE(tmp) * t;
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IM(y[m]) = -IM(tmp) * t;
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2018-10-24 17:39:51 +00:00
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2020-07-17 18:09:28 +00:00
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}
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2018-10-24 17:39:51 +00:00
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}
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2020-07-17 18:09:28 +00:00
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return RES_OK;
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2018-10-24 17:39:51 +00:00
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}
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