o_mag.c
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	#include<stdio.h>
	#include<math.h>
	#include<fonction.h>
	#include<constant.h>
	#include<dimension.h>
	#include<structure.h>

	/****************************************************************/
	/* nom: magfast */
	/* auteur: Jean-Paul Kneib */
	/* date: 10/02/92 */
	/* place: Toulouse */
	/****************************************************************/


	void o_mag(int n, struct galaxie *arclet)
	{
	register int i;
	double A, B, C;
	struct matrix MA;


	for (i = 0; i < n; i++)
	{
	MA = e_grad2_gal(&arclet[i], NULL);
	MA.a *= arclet[i].dr;
	MA.b *= arclet[i].dr;
	MA.c *= arclet[i].dr;
	MA.d *= arclet[i].dr;
	A = 1. - MA.a;
	B = -MA.b;
	C = 1. - MA.c;
	arclet[i].A = fabs(A * C - B * B);
	arclet[i].thp = PI / 2. + 0.5 * atan2(2.*B, (A - C));
	arclet[i].dp = (A * A + C * C + 2.B B) / arclet[i].A / 2.;
	arclet[i].tp = sqrt(arclet[i].dp * arclet[i].dp - 1.);
	}

	}