#include "nrutil.h"

float amotry(p,y,psum,ndim,funk,ihi,fac)
float (*funk)(),**p,fac,psum[],y[];
int ihi,ndim;
{
	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;
}