shoot.c

来自「可以用于科学计算的库」· C语言 代码 · 共 38 行

#define NRANSI
#include "nrutil.h"
#define EPS 1.0e-6

extern int nvar;
extern float x1,x2;

int kmax,kount;
float *xp,**yp,dxsav;

void shoot(int n, float v[], float f[])
{
	void derivs(float x, float y[], float dydx[]);
	void load(float x1, float v[], float y[]);
	void odeint(float ystart[], int nvar, float x1, float x2,
		float eps, float h1, float hmin, int *nok, int *nbad,
		void (*derivs)(float, float [], float []),
		void (*rkqs)(float [], float [], int, float *, float, float,
		float [], float *, float *, void (*)(float, float [], float [])));
	void rkqs(float y[], float dydx[], int n, float *x,
		float htry, float eps, float yscal[], float *hdid, float *hnext,
		void (*derivs)(float, float [], float []));
	void score(float xf, float y[], float f[]);
	int nbad,nok;
	float h1,hmin=0.0,*y;

	y=vector(1,nvar);
	kmax=0;
	h1=(x2-x1)/100.0;
	load(x1,v,y);
	odeint(y,nvar,x1,x2,EPS,h1,hmin,&nok,&nbad,derivs,rkqs);
	score(x2,y,f);
	free_vector(y,1,nvar);
}
#undef EPS
#undef NRANSI