Mathc initiation/Fichiers c : c25ca

Sommaire

Installer et compiler ces fichiers dans votre répertoire de travail.

	c16a.c

/* --------------------------------- */
/* save as c16a.c                    */
/* --------------------------------- */
#include "x_hfile.h"
#include      "fa.h"
/* --------------------------------- */
int main(void)
{
double   h = .0001;
pt2d  p = i_pt2d(0.5,0.2); 

 clrscrn();
 printf(" f   : x,y-> %s\n\n",   feq  );
 printf(" f_x : x,y-> %s\n\n\n",Dfeq_x);

 printf("  f_x(%0.2f,%0.2f) = %0.9f  with the equation\n\n",
           p.x,p.y,   f_x(p.x,p.y));
 printf("  f_x(%0.2f,%0.2f) = %0.9f  with the formula \n\n",
           p.x,p.y, fxy_x(f,h,p));
 stop();

 clrscrn();
 printf(" f   : x,y-> %s\n\n",   feq  );
 printf(" f_y : x,y-> %s\n\n\n",Dfeq_y);

 printf("  f_y(%0.2f,%0.2f) = %0.9f  with the equation\n\n",
           p.x,p.y,   f_y(       p.x,p.y  ));
 printf("  f_y(%0.2f,%0.2f) = %0.9f  with the formula \n\n",
           p.x,p.y, fxy_y(f,h,p));

 stop();

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

Essayez avec h = .1, h = .01, h = .001, h = .0001, h = .00001 pour observer l'augmentation de la précision des calculs.

Exemple de sortie écran :

 f   : x,y-> y**2 * sin(x*y)

 f_x : x,y-> y**3 * cos(x*y)


  f_x(0.50,0.20) = 0.007960033  with the equation

  f_x(0.50,0.20) = 0.007960033  with the formula 

 Press return to continue.

Exemple de sortie écran :

 f   : x,y-> y**2 * sin(x*y)

 f_y : x,y-> x*y**2 * cos(x*y) + 2*y * sin(x*y)


  f_y(0.50,0.20) = 0.059833450  with the equation

  f_y(0.50,0.20) = 0.059833455  with the formula 

 Press return to continue.