Mathc matrices/c21z
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c00a.c |
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/* ------------------------------------ */
/* Save as : c00a.c */
/* ------------------------------------ */
#include "v_a.h"
/* ------------------------------------ */
#define RA R4
#define CA C6
#define Cb C1
/* ------------------------------------ */
#define CB C2 /* B : a basis for the column space of A */
/* ------------------------------------ */
int main(void)
{
double ab[RA*(CA+Cb)]={
+9, -27, +36, -18, +45, +36, +0,
+14, -42, +63, -7, +56, +14, +0,
+3, -9, +12, -6, +15, +12, +0,
-5, +15, -20, +10, -25, -20, +0
};
double **Ab = ca_A_mR(ab,i_Abr_Ac_bc_mR(RA,CA,Cb));
double **A = c_Ab_A_mR(Ab, i_mR(RA,CA));
double **b = c_Ab_b_mR(Ab, i_mR(RA,Cb));
double **B = i_mR(RA,CB);
double **BT = i_mR(CB,RA);
double **BTb = i_Abr_Ac_bc_mR(CB,RA,Cb);
clrscrn();
printf("Basis for a Column Space by Row Reduction :\n\n");
printf(" A :");
p_mR(A,S6,P1,C10);
printf(" b :");
p_mR(b,S6,P1,C10);
printf(" Ab :");
p_mR(Ab,S6,P1,C10);
stop();
clrscrn();
printf(" The leading 1’s of Ab give the position \n"
" of the columns of A which form a basis \n"
" for the column space of A \n\n"
" A :");
p_mR(A,S7,P3,C10);
printf(" gj_PP_mR(Ab,NO) :");
gj_PP_mR(Ab,NO);
p_mR(Ab,S7,P3,C10);
c_c_mR(A,C1,B,C1);
c_c_mR(A,C3,B,C2);
printf(" B : a basis for the column space of A");
p_mR(B,S7,P3,C10);
stop();
clrscrn();
printf(" Check if the columns of B are linearly independent\n\n");
printf(" B :");
p_mR(B, S7,P3,C10);
printf(" BT :");
p_mR(transpose_mR(B,BT), S7,P3,C10);
printf(" BTb :");
p_mR(c_mR(BT,BTb), S7,P3,C10);
printf(" gj_PP_FreeV_mZ(BTb) :");
p_mR(gj_PP_mR(BTb,NO), S7,P3,C10);
stop();
f_mR(Ab);
f_mR(b);
f_mR(A);
f_mR(B);
f_mR(BT);
f_mR(BTb);
return 0;
}
/* ------------------------------------ */
/* ------------------------------------ */
La position des pivots de Ab donne la position des colonnes de A qui forment une base pour l'espace colonnes de A.
Exemple de sortie écran :
Basis for a Column Space by Row Reduction :
A :
+9.0 -27.0 +36.0 -18.0 +45.0 +36.0
+14.0 -42.0 +63.0 -7.0 +56.0 +14.0
+3.0 -9.0 +12.0 -6.0 +15.0 +12.0
-5.0 +15.0 -20.0 +10.0 -25.0 -20.0
b :
+0.0
+0.0
+0.0
+0.0
Ab :
+9.0 -27.0 +36.0 -18.0 +45.0 +36.0 +0.0
+14.0 -42.0 +63.0 -7.0 +56.0 +14.0 +0.0
+3.0 -9.0 +12.0 -6.0 +15.0 +12.0 +0.0
-5.0 +15.0 -20.0 +10.0 -25.0 -20.0 +0.0
Press return to continue.
The leading 1’s of Ab give the position
of the columns of A which form a basis
for the column space of A
A :
+9.000 -27.000 +36.000 -18.000 +45.000 +36.000
+14.000 -42.000 +63.000 -7.000 +56.000 +14.000
+3.000 -9.000 +12.000 -6.000 +15.000 +12.000
-5.000 +15.000 -20.000 +10.000 -25.000 -20.000
gj_PP_mR(Ab,NO) :
+1.000 -3.000 +4.500 -0.500 +4.000 +1.000 +0.000
-0.000 -0.000 +1.000 +3.000 -2.000 -6.000 -0.000
+0.000 +0.000 +0.000 +0.000 +0.000 +0.000 +0.000
+0.000 +0.000 +0.000 +0.000 +0.000 +0.000 +0.000
B : a basis for the column space of A
+9.000 +36.000
+14.000 +63.000
+3.000 +12.000
-5.000 -20.000
Press return to continue.
Check if the columns of B are linearly independent
B :
+9.000 +36.000
+14.000 +63.000
+3.000 +12.000
-5.000 -20.000
BT :
+9.000 +14.000 +3.000 -5.000
+36.000 +63.000 +12.000 -20.000
BTb :
+9.000 +14.000 +3.000 -5.000 +0.000
+36.000 +63.000 +12.000 -20.000 +0.000
gj_PP_FreeV_mZ(BTb) :
+1.000 +1.750 +0.333 -0.556 +0.000
-0.000 +1.000 -0.000 -0.000 -0.000
Press return to continue.