jacobn.c

来自「Numerical Recipes Software 提供的算法子程序集」· C语言 代码 · 共 27 行

void jacobn(x,y,dfdx,dfdy,n)
float **dfdy,dfdx[],x,y[];
int n;
{
	int i;

	for (i=1;i<=n;i++) dfdx[i]=0.0;
	dfdy[1][1] = -0.013-1000.0*y[3];
	dfdy[1][2]=0.0;
	dfdy[1][3] = -1000.0*y[1];
	dfdy[2][1]=0.0;
	dfdy[2][2] = -2500.0*y[3];
	dfdy[2][3] = -2500.0*y[2];
	dfdy[3][1] = -0.013-1000.0*y[3];
	dfdy[3][2] = -2500.0*y[3];
	dfdy[3][3] = -1000.0*y[1]-2500.0*y[2];
}

void derivs(x,y,dydx)
float dydx[],x,y[];
{
	dydx[1] = -0.013*y[1]-1000.0*y[1]*y[3];
	dydx[2] = -2500.0*y[2]*y[3];
	dydx[3] = -0.013*y[1]-1000.0*y[1]*y[3]-2500.0*y[2]*y[3];
}
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