411 REFERENCE · Wikibooks
Linear Algebra and the C Language/a05f
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__NOTOC__
Install and compile this file in your working directory.
/* ------------------------------------ */
/* Save as : c00a.c */
/* ------------------------------------ */
#include "v_a.h"
/* ------------------------------------ */
#define RA R3
#define CA C3
/* ------------------------------------ */
int main(void)
{
double a[RA*CA] ={ 4,2,3,
5,3,1,
8,2,2};
double **A = ca_A_mR(a,i_mR(RA,CA));
int r = R1;
int c = C2;
clrscrn();
printf(" A :");
p_mR(A,S5,P0,C6);
printf(" minor(R%d,C%d) = %+.3f\n"
" cofactor(R%d,C%d) = %+.3f\n\n\n",
r,c, minor_R(A, r,c),
r,c, cofactor_R(A, r,c));
printf(" cofactor(R%d,C%d) = minor(R%d,C%d)*(-1**(R%d+C%d))\n"
" = minor(R%d,C%d)*(%0.0f)\n\n\n",
r,c, r,c, r,c, r,c, pow(-1,(r+c)));
stop();
f_mR(A);
return 0;
}
/* ------------------------------------ */
/* ------------------------------------ */
Screen output example:
A :
+4 +2 +3
+5 +3 +1
+8 +2 +2
minor(R1,C2) = +2.000
cofactor(R1,C2) = -2.000
cofactor(R1,C2) = minor(R1,C2)*(-1**(R1+C2))
= minor(R1,C2)*(-1)
Press return to continue.