kopia lustrzana https://github.com/Dsplib/libdspl-2.0
101 wiersze
2.3 KiB
C
101 wiersze
2.3 KiB
C
/*
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* Copyright (c) 2015-2019 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 <stdlib.h>
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#include <math.h>
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#include "dspl.h"
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/*******************************************************************************
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Linspace array filling
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*******************************************************************************/
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int DSPL_API linspace(double x0, double x1, int n, int type, double* x)
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{
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double dx;
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int k;
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if(n < 2)
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return ERROR_SIZE;
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if(!x)
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return ERROR_PTR;
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switch (type)
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{
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case DSPL_SYMMETRIC:
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dx = (x1 - x0)/(double)(n-1);
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x[0] = x0;
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for(k = 1; k < n; k++)
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x[k] = x[k-1] + dx;
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break;
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case DSPL_PERIODIC:
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dx = (x1 - x0)/(double)n;
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x[0] = x0;
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for(k = 1; k < n; k++)
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x[k] = x[k-1] + dx;
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break;
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default:
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return ERROR_SYM_TYPE;
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}
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return RES_OK;
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}
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/*******************************************************************************
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Logspace array filling
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*******************************************************************************/
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int DSPL_API logspace(double x0, double x1, int n, int type, double* x)
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{
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double mx, a, b;
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int k;
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if(n < 2)
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return ERROR_SIZE;
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if(!x)
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return ERROR_PTR;
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a = pow(10.0, x0);
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b = pow(10.0, x1);
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switch (type)
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{
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case DSPL_SYMMETRIC:
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mx = pow(b/a, 1.0/(double)(n-1));
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x[0] = a;
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for(k = 1; k < n; k++)
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x[k] = x[k-1] * mx;
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break;
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case DSPL_PERIODIC:
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mx = pow(b/a, 1.0/(double)n);
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x[0] = a;
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for(k = 1; k < n; k++)
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x[k] = x[k-1] * mx;
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break;
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default:
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return ERROR_SYM_TYPE;
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}
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return RES_OK;
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}
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