qromo.c

< C语言数值算法程序大全>>配套程序

#include <math.h>
#define EPS 1.0e-6
#define JMAX 14
#define JMAXP (JMAX+1)
#define K 5

float qromo(func,a,b,choose)
float (*choose)(),(*func)(),a,b;
{
	void polint();
	void nrerror();
	int j;
	float ss,dss,h[JMAXP+1],s[JMAXP+1];

	h[1]=1.0;
	for (j=1;j<=JMAX;j++) {
		s[j]=(*choose)(func,a,b,j);
		if (j >= K) {
			polint(&h[j-K],&s[j-K],K,0.0,&ss,&dss);
			if (fabs(dss) < EPS*fabs(ss)) return ss;
		}
		s[j+1]=s[j];
		h[j+1]=h[j]/9.0;
	}
	nrerror("Too many steps in routing qromo");
	return 0.0;
}
#undef EPS
#undef JMAX
#undef JMAXP
#undef K