411 REFERENCE · Wikibooks
Linear Algebra and the C Language/a0gp
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__NOTOC__
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/* ------------------------------------ */
/* Save as : c00b.c */
/* ------------------------------------ */
#include "v_a.h"
/* ------------------------------------ */
void fun(int rc)
{
int P = rp_I(R4)+R1;
double **A = rsymmetric_mR( i_mR(rc,rc),9);
double **An = pow_mR(P,A, i_mR(rc,rc));
clrscrn();
printf(" A : ");
p_mR(A, S4,P0,C6);
printf(" A**%d : ",P);
p_mR(An, S9,P0,C6);
f_mR(A);
f_mR(An);
}
/* ------------------------------------ */
int main(void)
{
time_t t;
srand(time(&t));
do
fun(rp_I(RC3)+RC1);
while(stop_w());
return 0;
}
/* ------------------------------------ */
/* ------------------------------------ */
For all n, A**n is symmetric if A is symmetric.
Screen output example:
A :
-2 +1 +6 +4
+1 -1 -3 +2
+6 -3 -4 +2
+4 +2 +2 +1
A**2 :
+57 -13 -31 +10
-13 +15 +25 -2
-31 +25 +65 +12
+10 -2 +12 +25
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