Mathc complexes/a253
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c04d.c |
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/* ------------------------------------ */
/* Save as : c04d.c */
/* ------------------------------------ */
#include "w_a.h"
/* ------------------------------------ */
/* ------------------------------------ */
#define RB R4
#define CB C2
/* ------------------------------------ */
/* ------------------------------------ */
int main(void)
{
double b[RB*(CB*C2)]={
+0.072961373391,-0.506437768240, +1.534334763948,-0.444206008584,
-1.373390557940,-0.231759656652, -1.263948497854,-0.491416309013,
+1.000000000000,+0.000000000000, -0.000000000000,+0.000000000000,
-0.000000000000,-0.000000000000, +1.000000000000,-0.000000000000
};
double x[RB*(C1*C2)]={
-1,-3,
2,-4,
-3,-5,
-1,-2,
};
double **B = ca_A_mZ(b, i_mZ(RB,CB));
double **BT = i_mZ(CB,RB);
double **BTB = i_mZ(CB,CB); // BT*B
double **invBTB = i_mZ(CB,CB); // inv(BT*B)
double **invBTB_BT = i_mZ(CB,RB); // inv(BT*B)*BT
double **B_invBTB_BT = i_mZ(RB,RB); // B_inv(BT*B)*BT
double **Id = eye_mZ( i_mZ(RB,RB));
double **V = i_mZ(RB,RB); // V = Id - (B_inv(BT*B)*BT)
double **X = ca_A_mZ(x, i_mZ(RB,C1));
double **VX = i_mZ(RB,C1);
clrscrn();
printf(" B is a basis for the orthogonal complement of A : \n\n"
" Find a transformation matrix for \n"
" a projection onto R%d : \n\n"
" Proj(x) = [Id-(B*inv(BT*B)*BT)] * x \n\n",RB);
printf(" B :");
p_mZ(B,S5,P4,S5,P4,C7);
stop();
clrscrn();
printf(" BT :");
p_mZ(ctranspose_mZ(B,BT),S5,P4,S5,P4,C7);
printf(" BTB :");
p_mZ(mul_mZ(BT,B,BTB),S5,P4,S5,P4,C7);
printf(" inv(BT*B) :");
printf(" inv(BT*B) :");
p_mZ(invgj_mZ(BTB,invBTB),S5,P4,S5,P4,C7);
printf(" inv(BT*B)*BT :");
p_mZ(mul_mZ(invBTB,BT,invBTB_BT),S5,P4,S5,P4,C7);
printf(" B*inv(BT*B)*BT :");
p_mZ(mul_mZ(B,invBTB_BT,B_invBTB_BT),S5,P4,S5,P4,C7);
printf(" V = Id - (B*inv(BT*B)*BT) :");
p_mZ(sub_mZ(Id,B_invBTB_BT,V),S5,P4,S5,P4,C7);
stop();
clrscrn();
printf(" V is transformation matrix for \n"
" a projection onto a subspace R%d :\n\n",RB);
p_mZ(V,S5,P4,S5,P4,C7);
printf(" X :");
p_mZ(X,S5,P1,S5,P1,C7);
printf(" Proj(x) = [Id-(B*inv(BT*B)*BT)] * x \n\n");
printf(" Proj(x) = V * x :");
p_mZ(mul_mZ(V,X,VX),S5,P4,S5,P4,C7);
stop();
f_mZ(B);
f_mZ(BT);
f_mZ(BTB); // BT*B
f_mZ(invBTB); // inv(BT*B)
f_mZ(invBTB_BT); // inv(BT*B)*BT
f_mZ(V); // B*inv(BT*B)*BT
f_mZ(X);
f_mZ(VX);
return 0;
}
/* ------------------------------------ */
/* ------------------------------------ */
Trouver une projection sur un sous-espace vectoriel par une application linéaire :
- B est une base pour le complément orthogonal de A. Trouver une matrice V qui projette un vecteur x sur R4.
Proj(x) = V * x
V = Id - (B * inv(BT*B) * BT) .
Exemple de sortie écran :
------------------------------------
B is a basis for the orthogonal complement of A :
Find a transformation matrix for
a projection onto R4 :
Proj(x) = [Id-(B*inv(BT*B)*BT)] * x
B :
+0.0730-0.5064i +1.5343-0.4442i
-1.3734-0.2318i -1.2639-0.4914i
+1.0000+0.0000i -0.0000+0.0000i
-0.0000-0.0000i +1.0000-0.0000i
Press return to continue.
------------------------------------
BT :
+0.0730+0.5064i -1.3734+0.2318i +1.0000-0.0000i -0.0000+0.0000i
+1.5343+0.4442i -1.2639+0.4914i -0.0000-0.0000i +1.0000+0.0000i
BTB :
+3.2017+0.0000i +2.1867+1.1266i
+2.1867-1.1266i +5.3906+0.0000i
inv(BT*B) : inv(BT*B) :
+0.4809-0.0000i -0.1951-0.1005i
-0.1951+0.1005i +0.2857+0.0000i
inv(BT*B)*BT :
-0.2196+0.0027i -0.3645+0.1426i +0.4809-0.0000i -0.1951-0.1005i
+0.3732+0.0354i -0.1164-0.0429i -0.1951+0.1005i +0.2857+0.0000i
B*inv(BT*B)*BT :
+0.5736+0.0000i -0.1520+0.1809i -0.2196-0.0027i +0.3732-0.0354i
-0.1520-0.1809i +0.6598-0.0000i -0.3645-0.1426i -0.1164+0.0429i
-0.2196+0.0027i -0.3645+0.1426i +0.4809-0.0000i -0.1951-0.1005i
+0.3732+0.0354i -0.1164-0.0429i -0.1951+0.1005i +0.2857+0.0000i
V = Id - (B*inv(BT*B)*BT) :
+0.4264-0.0000i +0.1520-0.1809i +0.2196+0.0027i -0.3732+0.0354i
+0.1520+0.1809i +0.3402+0.0000i +0.3645+0.1426i +0.1164-0.0429i
+0.2196-0.0027i +0.3645-0.1426i +0.5191+0.0000i +0.1951+0.1005i
-0.3732-0.0354i +0.1164+0.0429i +0.1951-0.1005i +0.7143+0.0000i
Press return to continue.
------------------------------------
V is transformation matrix for
a projection onto a subspace R4 :
+0.4264-0.0000i +0.1520-0.1809i +0.2196+0.0027i -0.3732+0.0354i
+0.1520+0.1809i +0.3402+0.0000i +0.3645+0.1426i +0.1164-0.0429i
+0.2196-0.0027i +0.3645-0.1426i +0.5191+0.0000i +0.1951+0.1005i
-0.3732-0.0354i +0.1164+0.0429i +0.1951-0.1005i +0.7143+0.0000i
X :
-1.0 -3.0i
+2.0 -4.0i
-3.0 -5.0i
-1.0 -2.0i
Proj(x) = [Id-(B*inv(BT*B)*BT)] * x
Proj(x) = V * x :
-1.0475-2.6443i
+0.4886-4.4384i
-1.6203-5.4855i
-1.1310-1.3276i
Press return to continue.