Mathc initiation/Fichiers c : c74c02
Apparence
Installer et compiler ces fichiers dans votre répertoire de travail.
c01b.c |
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/* ---------------------------------- */
/* save as c1b.c */
/* ---------------------------------- */
#include "x_hfile.h"
#include "fb.h"
/* ---------------------------------- */
int main(void)
{
int n = 2*50;
double a = 1;
double b = 2;
clrscrn();
printf(" With the Simpson's rule. (n = %d)\n\n"
" (%.3f\n"
" int( (%s) dx = %.6f\n"
" (%.3f\n\n\n\n",n, b, feq, simpson(f,a,b,n), a);
printf(" With the antiderivative of f.\n\n"
" F(x) = %s \n\n\n"
" F(%.3f) - F(%.3f) = %.6f \n\n\n", Feq, b,a, F(b)-F(a));
stop();
return 0;
}
/* ---------------------------------- */
Calculons l'intégrale avec la fonction simpson(f,a,b,n); puis avec sa primitive F(x).
Exemple de sortie écran :
With the Simpson's rule. (n = 100)
(2.000
int( ((csc(x)) dx = 1.047605
(1.000
With the antiderivative of f.
F(x) = ln( |csc(x)-cot(x)| )
F(2.000) - F(1.000) = 1.047605
Press return to continue.
Calculons la primitive :
Calculer la primitive de
/ /
| csc(x) dx = | csc(x) * (1) dx
/ /
/ csc(x) - cot(x)
= | csc(x) * (-----------------) dx
/ csc(x) - cot(x)
____________________________________
/ csc(x)**2 - cot(x) * csc(x) | u = csc(x) - cot(x) |
= | (-----------------------------) dx |du = -cot(x)*csc(x) + csc(x)**2 dx |
/ csc(x) - cot(x) |___________________________________|
/ /
| csc(x) dx = | 1/u du
/ /
= ln( |u| ) + c
= ln( |csc(x)-cot(x)| ) + c