Linear Algebra and the C Language/a0kc

Install and compile this file in your working directory.

/* ------------------------------------ */
/*  Save as :   c00a.c                  */
/* ------------------------------------ */
#include "v_a.h"
/* ------------------------------------ */
/* ------------------------------------ */
double **X_gj_TP_mR(
double **Ab
)
{
   gj1_T_mR(Ab); /* Best pivot       */
  sort_c_mR(Ab); /* Sort the columns */
  sort_r_mR(Ab); /* Sort the rows    */
  
return(Ab);
}
/* ------------------------------------ */
/* ------------------------------------ */
void fun(int r)
{
double **A  = r_mR(                      i_mR(r,r ),999.);
double **b  = r_mR(                      i_mR(r,C1),999.);

double **Ab = c_A_b_Ab_mR(A,b, i_Abr_Ac_bc_mR(r,   r,  C1)); 
/*                             i_Abr_Ac_bc_mR(RAb, CA, Cb));          */
  
  clrscrn();
  printf(" Copy/Paste into the octave window.\n\n");
  p_Octave_mR(Ab,"Ab",P0);
  printf("\n rref(Ab,.00000000001)\n\n");
  stop();

  clrscrn();
  X_gj_TP_mR(Ab);
  printf(" See above for the function code:\n\n gj_TP_mR(Ab); ");
  p_mR(Ab, S10,P4,C7);

  
  f_mR(Ab);
  f_mR(b);
  f_mR(A);
}
/* ------------------------------------ */
int main(void)
{
time_t t;

  srand(time(&t));
do
{
  fun(RC5);


} while(stop_w());

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

Screen output example:

                                                                                       
 Copy/Paste into the octave window.

 Ab=[
-327,+406,+622,-53,-91,-761;
-384,+609,-594,+400,-431,-499;
-398,-382,-988,+593,+559,+137;
-593,-339,+616,-390,-333,-910;
+840,-475,-17,-369,-686,+962]


 rref(Ab,.00000000001)

 Press return to continue. 


 See above for the function code:

 gj_TP_mR(Ab); 
   +1.0000    +0.0000    +0.0000    +0.0000    +0.0000    +1.1624 
   +0.0000    +1.0000    +0.0000    +0.0000    +0.0000    -0.2555 
   +0.0000    +0.0000    +1.0000    +0.0000    +0.0000    -0.4157 
   -0.0000    +0.0000    +0.0000    +1.0000    +0.0000    -0.0858 
   +0.0000    -0.0000    -0.0000    +0.0000    +1.0000    +0.2544 


 Press   return to continue
 Press X return to stop