Mathc initiation/a124

Sommaire

Installer et compiler ces fichiers dans votre répertoire de travail.

	c00a1.c

/* --------------------------------- */
/* save as c00a1.c                   */
/* --------------------------------- */
#include "x_hfile.h"
#include      "fa.h"
/* --------------------------------- */
int main(void)
{
CTRL_splot w;

  w.xmin = -2.5;
  w.xmax = +2.5;             
  w.ymin = -2.5;
  w.ymax = +2.5;
  
tvalue     t;	

  t.value =  0.;
  t.min   =  0.; 
  t.max   =  4.*PI;  
  t.step  = .05;  
  	
 clrscrn();

 printf(" r(t) = f(t)i + g(t)j \n\n");
 printf(" With \n\n");
 printf(" f : t-> %s  \n", feq);
 printf(" g : t-> %s\n\n", geq);

 printf(" Animate the velocity and accelerator vectors\n\n" 
        " ... load \"a_main.plt\" ... with gnuplot.   \n\n");
 
  do{
	  
  G_Curve_2d(w,
             f,g,
             t
            );
            
   pause(9.E7);
      
  } while((t.value+=t.step)<t.max);

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

Draw the velocity and the accelerator vectors at the point P(f(t),g(t)) in 2d

Exemple de sortie écran :

 r(t) = f(t)i + g(t)j 

 With 

 f : t-> cos(t)**2  
 g : t-> 2*sin(t)

 Animate the velocity and accelerator vectors

 ... load "a_main.plt" ... with gnuplot