amotry.c

来自「可以用于科学计算的库」· C语言 代码 · 共 27 行

#define NRANSI
#include "nrutil.h"

float amotry(float **p, float y[], float psum[], int ndim,
	float (*funk)(float []), int ihi, float fac)
{
	int j;
	float fac1,fac2,ytry,*ptry;

	ptry=vector(1,ndim);
	fac1=(1.0-fac)/ndim;
	fac2=fac1-fac;
	for (j=1;j<=ndim;j++) ptry[j]=psum[j]*fac1-p[ihi][j]*fac2;
	ytry=(*funk)(ptry);
	if (ytry < y[ihi]) {
		y[ihi]=ytry;
		for (j=1;j<=ndim;j++) {
			psum[j] += ptry[j]-p[ihi][j];
			p[ihi][j]=ptry[j];
		}
	}
	free_vector(ptry,1,ndim);
	return ytry;
}
#undef NRANSI