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amplif_mat.c
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Sun, Dec 29, 19:48

amplif_mat.c
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#include<stdio.h>
#include<math.h>
#include<fonction.h>
#include<constant.h>
#include<dimension.h>
#include<structure.h>
/****************************************************************/
/* nom: amplif_mat */
/* auteur: Ghislain Golse */
/* date: 08/01 */
/* place: Toulouse */
/****************************************************************
* Calcul de la matrice d'amplification pour chaque image (i,j) *
*
* Global variables used :
* - I, multi, amplifi_mat
* - in e_grad2() : G, lens, lens_table
* - in distcosmo1() : C
* - in e_amp() : G, lens, lens_table
*/
void amplif_mat()
{
const extern struct g_image I;
extern struct galaxie multi[NFMAX][NIMAX];
extern struct matrix amplifi_mat[NFMAX][NIMAX];
struct matrix Mat;
double A;
register int i, j;
for (i = 0; i < I.n_mult; i++)
for (j = 0; j < I.mult[i]; j++)
{
Mat = e_grad2_gal(&multi[i][j], NULL);
Mat.a /= multi[i][j].dos;
Mat.b /= multi[i][j].dos;
Mat.c /= multi[i][j].dos;
// Prevent infinite amplification issues
// and makes sure amplification is bounded by MAXAMPINV or -MAXAMPINV
#define MAXAMPINV 0.001
A = (1. - Mat.a) * (1. - Mat.c) - Mat.b * Mat.b;
// if( fabs(A) < MAXAMPINV )
// {
// double k, g2, koffset, d;
// k = 1. - 0.5 * (Mat.a + Mat.c); // 1-k
// g2 = 0.5 * (Mat.a - Mat.c);
// g2 = g2 * g2 + Mat.b * Mat.b;
// if( A < 0. && g2 >= MAXAMPINV )
// d = A + MAXAMPINV;
// else
// d = A - MAXAMPINV;
//
// if( k * k - d < 0. ) exit(1);
//
// koffset = k + sqrt(k * k - d);
// Mat.a += koffset;
// Mat.c += koffset;
// A = (1. - Mat.a) * (1. - Mat.c) - Mat.b * Mat.b;
// }
amplifi_mat[i][j].a = (1. - Mat.c) / A;
amplifi_mat[i][j].b = -Mat.b / A;
amplifi_mat[i][j].c = (1. - Mat.a) / A;
amplifi_mat[i][j].d = amplifi_mat[i][j].b;
}
}

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