Mathc initiation/Fichiers h : z d

Installer et compiler ces fichiers dans votre répertoire de travail.

	`c0c1.c`

/* --------------------------------- */
/* save as c0c1.c                    */
/* --------------------------------- */
#include "x_hfile.h"
#include      "fc.h"
/* --------------------------------- */
int main(void)
{
double h = .001;
pt2d   p = i_pt2d(-2.,1.);
v2d    u = grad_fxy(f,h,p);

 clrscrn();
 printf(" Let f be a function of two variables.\n\n");
 printf(" The Gradiant of f is the vector function given by :\n\n\n");
 printf("     grad f(x,y) = f_x(x,y) i + f_y(x,y) j\n\n\n\n\n\n");

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

 printf(" Find the gradient of f at the point p(%+.1f,%+.1f)\n\n\n",p.x,p.y);

 printf(" grad f(x,y)]p = %+.3fi  %+.3fj  \n\n\n",u.i,u.j);

 stop();

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

grad f(x,y)]p = Le gradient au point p.

Exemple de sortie écran :

 Let f be a function of two variables.

 The Gradiant of f is the vector function given by :


     grad f(x,y) = f_x(x,y) i + f_y(x,y) j





 If f   : x,y-> 2*x**2-3*x*y+8*y**2+2*x-4*y+4

 Find the gradient of f at the point p(-2.0,+1.0)


 grad f(x,y)]p = -9.000i  +18.000j  


 Press return to continue.