Mathc initiation/Fichiers h : c32ca
Installer et compiler ces fichiers dans votre répertoire de travail.
c00a.c |
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/* ---------------------------------- */
/* save as c00a.c */
/* ---------------------------------- */
#include "x_hfile.h"
#include "fa.h"
/* ---------------------------------- */
int main(void)
{
double ax = 0, ay = 0,
bx = 2, by = 3,
nx = 2*10, ny = 2*10,
Mxy = 0, Myx = 0;
clrscrn();
printf(" f : (x,y)-> %s\n\n\n", feq);
Myx = simpson_dydx(f, ay,by,ny, ax,bx,nx);
Mxy = simpson_dxdy(f, ax,bx,nx, ay,by,ny);
printf(" With the simpsonal's rule.\n\n");
printf(" (%.3f (%.3f\n", bx,by);
printf(" int( int( %s Dy Dx = %.6f\n", feq, Myx);
printf(" (%.3f (%.3f\n\n\n", ax,ay);
printf(" (%.3f (%.3f\n", by,bx);
printf(" int( int( %s Dx Dy = %.6f\n", feq, Mxy);
printf(" (%.3f (%.3f\n\n\n", ay,ax);
stop();
return 0;
}
/* ---------------------------------- */
/* ---------------------------------- */
Vous pouvez vérifier avec Octave version 5.2 :
I = dblquad (f, xa, xb, ya, yb)
>> I = dblquad (@(x, y) 1./5. * sqrt(225-25*x.*x-9*y.*y), 0, 2, 0, 3)
I = 15.282
Exemple de sortie écran :
f : (x,y)-> 1./5. * sqrt(225-25*x**2-9*y**2)
With the simpsonal's rule.
(2.000 (3.000
int( int( 1./5. * sqrt(225-25*x**2-9*y**2) Dy Dx = 15.282213
(0.000 (0.000
(3.000 (2.000
int( int( 1./5. * sqrt(225-25*x**2-9*y**2) Dx Dy = 15.282213
(0.000 (0.000
Press return to continue.