Linear Algebra and the C Language/a0i0

Install and compile this file in your working directory.

/* ------------------------------------ */
/*  Save as :   c00a.c                  */
/* ------------------------------------ */
#include "v_a.h"
/* ------------------------------------ */
void fun(int r)
{
double **A     = rskewsymmetric_mR(      i_mR(r,r), 9);
double **AT    =      transpose_mR(A,    i_mR(r,r));
double **mns1A =           smul_mR(-1,A, i_mR(r,r));

  clrscrn();
  printf(" Skew-symmetric matrix : -A = AT\n\n\n"); 
  printf(" -A:");
  p_mR(mns1A, S7,P3,C6);
  printf(" AT:");
  p_mR(AT, S7,P3,C6);
        
  f_mR(A);
  f_mR(AT);
}
/* ------------------------------------ */
int main(void)
{
time_t t;

  srand(time(&t));

do
{
  fun(rp_I(R3)+R1);

} while(stop_w());

  return 0;
}
/* ------------------------------------ */
/* ------------------------------------ */

A skew-symmetric matrix is a square matrix whose transpose equals its negative: -A = AT

Screen output example:

                                                                                       
 Skew-symmetric matrix : -A = AT


 -A:
 -0.000  -4.000  -2.000  -8.000 
 +4.000  -0.000  -9.000  -1.000 
 +2.000  +9.000  -0.000  -4.000 
 +8.000  +1.000  +4.000  -0.000 

 AT:
 +0.000  -4.000  -2.000  -8.000 
 +4.000  +0.000  -9.000  -1.000 
 +2.000  +9.000  +0.000  -4.000 
 +8.000  +1.000  +4.000  +0.000 


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