libdspl-2.0/dspl/src/math_std/trapint_cmplx.c

53 wiersze
1.3 KiB
C

/*
* Copyright (c) 2015-2024 Sergey Bakhurin
* Digital Signal Processing Library [http://dsplib.org]
*
* This file is part of DSPL.
*
* is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DSPL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include "dspl.h"
#ifdef DOXYGEN_ENGLISH
#endif
#ifdef DOXYGEN_RUSSIAN
#endif
int DSPL_API trapint_cmplx(double* x, complex_t* y, int n, complex_t* sum)
{
int k;
double dx;
if(!x || !y)
return ERROR_PTR;
if(n<2)
return ERROR_SIZE;
RE(*sum) = IM(*sum) = 0.0;
for(k = 1; k < n; k++)
{
dx = 0.5 * (x[k] - x[k-1]);
RE(*sum) += dx * (RE(y[k]) + RE(y[k-1]));
IM(*sum) += dx * (IM(y[k]) + IM(y[k-1]));
}
return RES_OK;
}