Mathc initiation/a153

Installer et compiler ces fichiers dans votre répertoire de travail.

	`c00b.c`

/* --------------------------------- */
/* save as c00b.c                    */
/* --------------------------------- */
#include  "x_hfile.h"
#include       "fb.h"
/* --------------------------------- */
int main(void)
{
tvalue t;
double n = 2*200;
	
  t.value =        4.;
  t.min   =        0.; 
  t.max   =   t.value;  
  t.step  =        .1;  

double m = CurveLength3d_simpson(f,g,h,t.min,t.max,n);
          
 clrscrn();
 
 printf(" r(t) = f(t)i + g(t)j + h(t)k \n\n");
 printf(" With \n\n");
 printf(" f : t-> %s  \n", feq);
 printf(" g : t-> %s  \n", geq);
 printf(" h : t-> %s\n\n", heq);
 printf(" %+.2f < t < %+.2f \n\n",t.min,t.max);

 axe_3d();

 G_Curve_3d(
             f,g,h,
             t
            );

 printf(" ... load \"a_main.plt\" ... with gnuplot.\n\n");
 
 stop();      
      
 clrscrn();
 
 printf(" If a curve C has a smooth parametrization \n\n" 
        "      f : t-> %s, g : t-> %s, h : t-> %s\n\n" 
        " And if C does not intersect itself,\n" 
        " except possibly for t= a and t = b,\n" 
        " then the length L of C is        \n\n" 
        "     / b = %+.2f\n" 
        "    |   \n" 
        "    |    [Df(t)^2 + Dg(t)^2 + Dh(t)^2]^1/2  dt = %.3f\n"
        "    |   \n" 
        "   /   a = %+.2f\n\n\n", feq, geq, heq, t.max, m, t.min);

 stop();

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

Exemple de sortie écran :

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

 With 

 f : t-> 6*t  
 g : t-> 3*t**2  
 h : t-> t**3

 +0.00 < t < +4.00 

 open the file "a_main.plt" with Gnuplot.

Exemple de sortie écran :

 If a curve C has a smooth parametrization 

      f : t-> 6*t, g : t-> 3*t**2, h : t-> t**3

 And if C does not intersect itself,
 except possibly for t= a and t = b,
 then the length L of C is        

     / b = +4.00
    |   
    |    [Df(t)^2 + Dg(t)^2 + Dh(t)^2]^1/2  dt = 88.000
    |   
   /   a = +0.00



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