Low level routine
fr -
eng
rnoise_c - Rayleigh random numbers generator computational routine
/* rnoise_c subroutine
* Rayleigh noise generator
*
* Copyright (C) 2007-2009 Alan Layec
*
* This file is part of modnumlib.
*
* modnumlib 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 2 of the License, or
* (at your option) any later version.
*
* modnumlib 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 modnumlib; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/* REVISION HISTORY :
* $Log$
*/
#include <math.h>
#include <stdlib.h> /*pour RAND_MAX*/
#include "modnum_lib.h"
/* rnoise_c routine de calcul d'échantillons bruités de Rayleigh
*
* Entrées :
* n : dimension 1 de la matrice de sortie (scalaire)
* m : dimension 2 de la matrice de sortie (scalaire)
* sig : parametre (scalaire)
* Sorties :
* y : matrice de sortie
*
* dépendances
* math.h
*/
void rnoise_c(int *n,int *m,double *sig,double *y)
{
/*déclaration des variables*/
int i,l;
double rand_m,rand1;
int ind_y;
/*récupération de la valeur de RAND_MAX*/
rand_m=RAND_MAX;
for(l=0;l<(*m);l++) {
ind_y = (*n)*l;
for(i=0;i<(*n);i++) {
/*calcul rand1*/
rand1=rand()/rand_m;
/*test rand1*/
while((rand1<=0)||(rand1>=1)) rand1=rand()/rand_m;
/*Calcul sortie*/
y[ind_y+i]=sqrt(2*pow((*sig),2)*log(1/(1e-5+1-rand1)));
}
}
return;
}
INRIA A.Layec