Mathc matrices/03r

Étude du code

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	c00a.c

/* ------------------------------------ */
/*  Save as :   c00a.c                  */
/* ------------------------------------ */
#include "v_a.h"
/* ------------------------------------ */     
#define RCA          RC3  
#define EVALUE       RC3  
/* ------------------------------------ */       
/* ------------------------------------ */
void fun(void)
{                          
double a[RCA*RCA] ={   
+1.345288030, +1.760536858, -1.232763852, 
+1.760536858, +4.139646496, +0.479295438, 
-1.232763852, +0.479295438, +3.515065475    
};
                       
double **A      =   ca_A_mR(a,    i_mR(RCA,RCA));
double **V      = eigs_V_mR(A,    i_mR(RCA,RCA));

double **V3     =    c_c_mR(V,EVALUE, i_mR(RCA, C1),C1);
double **AV3    =    mul_mR(A,V3, i_mR(RCA, C1)); 

  clrscrn(); 
  printf(" A :");
  p_mR(A, S8,P5, C3);     

  printf(" V :");
  p_mR(V, S9,P5, C4); 
  
  printf(" V%d :",EVALUE);
  p_mR(V3, S8,P5, C3);

  printf(" A * V%d :",EVALUE);
  p_mR(AV3, S8,P5, C3);
  stop();
              
  f_mR(A);
  f_mR(V);  

  f_mR(V3); 
  f_mR(AV3); 
}
/* ------------------------------------ */
int main(void)
{
    fun();
    
  return 0;
}
/* ------------------------------------ */
/* ------------------------------------ */

Vérifier A v_λ = 0 quand λ = 0 (Rappel  : A v_λ = λ v_λ)

Exemple de sortie écran :

 A :
+1.34529 +1.76054 -1.23276 
+1.76054 +4.13965 +0.47930 
-1.23276 +0.47930 +3.51507 

 V :
 +0.45779  -0.27269  +0.84621 
 +0.88400  +0.24101  -0.40057 
 -0.09471  +0.93143  +0.35139 

 V3 :
+0.84621 
-0.40057 
+0.35139 

 A * V3 :
+0.00000 
-0.00000 
+0.00000 

 Press return to continue.