kopia lustrzana https://github.com/Dsplib/libdspl-2.0
156 wiersze
4.5 KiB
C
156 wiersze
4.5 KiB
C
/*
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* Copyright (c) 2015-2020 Sergey Bakhurin
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* Digital Signal Processing Library [http://dsplib.org]
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*
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* This file is part of libdspl-2.0.
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*
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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 Lesser 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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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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 Lesser General Public License
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* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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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 "dspl.h"
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#ifdef DOXYGEN_ENGLISH
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/*! ****************************************************************************
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\ingroup ARRAY_GROUP
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\fn int flipip_cmplx(complex_t* x, int n)
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\brief Flip complex vector `x` in place
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Function flips complex vector `x` length `n` in the memory
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\n
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For example complex vector `x` length 6: \n
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\verbatim
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x = [0+0j, 1+1j, 2+2j, 3+3j, 4+4j, 5+5j]
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\endverbatim
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After flipping it will be as follow:
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\verbatim
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x = [5+5j, 4+4j, 3+3j, 2+2j, 1+1j, 0+0j]
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\endverbatim
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\param[in, out] x
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Pointer to the complex vector `x`. \n
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Vector size is `[n x 1]`. \n
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Flipped vector will be on the same address. \n
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\param[in] n
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Length of the vector `x`. \n \n
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\return
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`RES_OK` if function returns successfully. \n
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Else \ref ERROR_CODE_GROUP "error code".
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Example:
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\code{.cpp}
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complex_t y[5] = {{0.0, 0.0}, {1.0, 1.0}, {2.0, 2.0}, {3.0, 3.0}, {4.0, 4.0}};
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for(i = 0; i < 5; i++)
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printf("%6.1f%+.1fj ", RE(y[i]), IM(y[i]));
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flipip_cmplx(y, 5);
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printf("\n");
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for(i = 0; i < 5; i++)
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printf("%6.1f%+.1fj ", RE(y[i]), IM(y[i]));
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\endcode
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\n
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Program result:
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\verbatim
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0.0+0.0j 1.0+1.0j 2.0+2.0j 3.0+3.0j 4.0+4.0j
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4.0+4.0j 3.0+3.0j 2.0+2.0j 1.0+1.0j 0.0+0.0j
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\endverbatim
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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 ARRAY_GROUP
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\fn int flipip_cmplx(complex_t* x, int n)
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\brief Функция отражения комплексного вектора `x`
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Функция производит отражение комплексного вектора длины `n`
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в памяти данных. \n
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Например исходный вектор `x` длины 6: \n
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\verbatim
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x = [0+0j, 1+1j, 2+2j, 3+3j, 4+4j, 5+5j]
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\endverbatim
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После отражения вектор `x` будет иметь вид:
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\verbatim
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x = [5+5j, 4+4j, 3+3j, 2+2j, 1+1j, 0+0j]
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\endverbatim
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\param[in, out] x
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Указатель на комплексный вектор `x`. \n
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Размер вектора `[n x 1]`. \n
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Результат отражения будет помещен по этому же адресу. \n
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\n
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\param[in] n
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Размер вектора `x`. \n
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\n
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\return
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`RES_OK` если функция выполнена успешно. \n
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В противном случае \ref ERROR_CODE_GROUP "код ошибки".
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Пример:
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\code{.cpp}
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complex_t y[5] = {{0.0, 0.0}, {1.0, 1.0}, {2.0, 2.0}, {3.0, 3.0}, {4.0, 4.0}};
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for(i = 0; i < 5; i++)
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printf("%6.1f%+.1fj ", RE(y[i]), IM(y[i]));
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flipip_cmplx(y, 5);
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printf("\n");
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for(i = 0; i < 5; i++)
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printf("%6.1f%+.1fj ", RE(y[i]), IM(y[i]));
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\endcode
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\n
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Результат выполнения:
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\verbatim
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0.0+0.0j 1.0+1.0j 2.0+2.0j 3.0+3.0j 4.0+4.0j
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4.0+4.0j 3.0+3.0j 2.0+2.0j 1.0+1.0j 0.0+0.0j
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\endverbatim
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\author
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Бахурин Сергей
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www.dsplib.org
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***************************************************************************** */
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#endif
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int DSPL_API flipip_cmplx(complex_t* x, int n)
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{
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int k;
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complex_t tmp;
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if(!x)
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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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for(k = 0; k < n/2; k++)
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{
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RE(tmp) = RE(x[k]);
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RE(x[k]) = RE(x[n-1-k]);
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RE(x[n-1-k]) = RE(tmp);
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IM(tmp) = IM(x[k]);
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IM(x[k]) = IM(x[n-1-k]);
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IM(x[n-1-k]) = IM(tmp);
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}
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return RES_OK;
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}
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