Mathc matrices/04d

Étude du code

Installer et compiler ces fichiers dans votre répertoire de travail.

	c00a.c

/* ------------------------------------ */
/*  Save as :   c00a.c                  */
/* ------------------------------------ */
#include "v_a.h"
/* ------------------------------------ */
#define   RCA R3
/* ------------------------------------ */
int main(void)
{
double a[RCA*RCA]={
+0.447406866326, -0.357925493061, -0.345142439737, 
-0.357925493061, +0.286340394449, +0.276113951790, 
-0.345142439737, +0.276113951790, +0.266252739226    
};

double **A = ca_A_mR(a,i_mR(RCA,RCA));

  clrscrn();
  printf(" Copy/Past into the octave windows \n\n");
  p_Octave_mR(A,"a",P12);
  printf(" [V, E] = eigs (a,%d) \n\n",RCA);
  stop();

  f_mR(A);
  
  return 0;
}
/* ------------------------------------ */
/* ------------------------------------ */

Vérifier avec octave

Exemple de sortie écran :

 Copy/Past into the octave windows 

 a=[
+0.447406866326,-0.357925493061,-0.345142439737;
-0.357925493061,+0.286340394449,+0.276113951790;
-0.345142439737,+0.276113951790,+0.266252739226]

 [V, E] = eigs (a,3) 

 Press return to continue.