411 REFERENCE · Wikibooks
Linear Algebra and the C Language/a0g0
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__NOTOC__
Install and compile this file in your working directory.
/* ------------------------------------ */
/* Save as : c00b.c */
/* ------------------------------------ */
#include "v_a.h"
/* ------------------------------------ */
int main(void)
{
double a[R3*C3]={ 1,1,1,
2,9,9,
3,9,9 };
double id[R3*C3]={ 1,0,0,
-2,1,0,
-3,0,1 };
double **A = ca_A_mR(a, i_mR(R3,C3));
double **ID = ca_A_mR(id,i_mR(R3,C3));
double **IDA = mul_mR(ID,A,i_mR(R3,C3));
clrscrn();
printf(" Zero under the pivot \n\n");
printf(" ID:");
p_mR(ID, S3,P0,C6);
printf(" A:");
p_mR(A, S3,P0,C6);
printf(" ID A:");
p_mR(IDA, S3,P1,C6);
stop();
f_mR(A);
f_mR(ID);
f_mR(IDA);
return 0;
}
/* ------------------------------------ */
/* ------------------------------------ */
Zero under the pivot "C1":
Screen output example:
Zero under the pivot
ID:
+1 +0 +0
-2 +1 +0
-3 +0 +1
A:
+1 +1 +1
+2 +9 +9
+3 +9 +9
ID A:
+1.0 +1.0 +1.0
+0.0 +7.0 +7.0
+0.0 +6.0 +6.0
Press return to continue.