Linear Algebra and the C Language/a0i5

__NOTOC__ Install and compile this file in your working directory. /* ------------------------------------ */ /* Save as : c00f.c */ /* ------------------------------------ */ #include "v_a.h" /* ------------------------------------ */ void fun(int rc) { double **A = rskewsymmetric_mR(i_mR(rc,rc),9); double **A_2 = i_mR(rc,rc); clrscrn(); printf(" A is a skew symmetric matrix"); p_mR(A, S4,P0,C6); printf(" A**2 is a symmetric negative semi-definite matrix"); p_mR(mul_mR(A,A,A_2), S4,P0,C6); f_mR(A); f_mR(A_2); } /* ------------------------------------ */ int main(void) { time_t t; srand(time(&t)); do fun(rp_I(RC4)+RC1); while(stop_w()); return 0; } /* ------------------------------------ */ /* ------------------------------------ */ A**2 is a negative semidefinite symmetric matrix Screen output example: A is a skew symmetric matrix +0 -5 -1 +5 +7 +5 +0 +5 -8 +1 +1 -5 +0 +1 +2 -5 +8 -1 +0 +5 -7 -1 -2 -5 +0 A**2 is a symmetric negative semi-definite matrix -100 +38 -44 +4 +18 +38 -115 +1 +25 +5 -44 +1 -31 +35 +7 +4 +25 +35 -115 -29 +18 +5 +7 -29 -79 Press return to continue Press X return to stop