aar_inv_gjd_r.c

一些矩阵运算的C代码实现：矩阵一般运算

/*         .h         freeware           http://groups.yahoo.com/group/mathc/ */

/* --------------------------------- INCLUDES ------------------------------- */
#include "v_ahfile.h"

/* ------------------------------------- FUNCTION --------------------------  */
/* Do    :                                                                    */
/*                                                                            */
/* -------------------------------------------------------------------------- */
void invB(int n)
{
double det;
int x;

mR mA    ={n,n,init_mR(n,n)};
mR minvA ={n,n,init_mR(n,n)};
mR mID   ={n,n,init_mR(n,n)};
/*-------------------------------- PROGRAM ---------------------------------- */
          x=   3;
 if(n==5){x=  10;}
 if(n==4){x=  20;}
 if(n==3){x=  50;}
 if(n==2){x= 100;}
 if(n==1){x=1000;}

    do
  {
               rnd_mR(&mA,x);
          det = det_R(&mA);
  }while(!det);

  clrscrn();

  printf(" A");
  p_mR(&mA);

  printf("\n inv(A)");
 inv_gjd_mR(&mA,&minvA);
      p_mR   (&minvA);

  printf("\n mA * inv(A)");
  mul_mR(&mA, &minvA,&mID);
   p_mR            (&mID);

 free(    mA.pb);
 free( minvA.pb);
 free(   mID.pb);
}

void hello(void)
{
  printf("\n Freeware by : xhunga bernard 06000 Nice France.\n");
  printf("\n                                                  ");
  printf("\n            Find the inverse of mA                ");
  printf("\n            **********************              \n");
  printf("\n The size of mA : 2x2 ... 4x4.                  \n");
  printf("\n           ex : \"inv_xhf.exe\"                 \n");
  printf("\n You can choose the size :                      \n");
  printf("\n           ex : \"inv_xhf.exe 2\" -> mA 2x2       ");
  printf("\n                \"inv_xhf.exe 3\" -> mA 3x3       ");
  printf("\n                \"inv_xhf.exe 4\" -> mA 4x4       ");
  printf("\n                                                  ");
  printf("\n Distributed  by :  http://www.simtel.net/        ");
  printf("\n                                                  ");
  printf("\n Press return to continue                          ");
  printf("\n                                                  ");

  getchar();
}

/* --------------------------------- MAIN ----------------------------------- */
int main(int argc, char *argv[])
{
time_t t;
int    n;

/*-------------------------------- PROGRAM ---------------------------------- */
  srand(time(&t));
  hello();
do
{
if( argc == 2 && atoi(argv[1]))
 {  n = atoi(argv[1]); if( n > 6){n=6;}}
else
 {  n = rndp_I(6);}
if( n < 1){n=1;}


  invB(n);


printf("\n Press 'X' Return to stop");
}while(toupper(getchar())!='X');

  return 0;
}