?? spline.c
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#define NRANSI#include "nrutil.h"void spline(float x[], float y[], int n, float yp1, float ypn, float y2[]){ int i,k; float p,qn,sig,un,*u; u=vector(1,n-1); if (yp1 > 0.99e30) y2[1]=u[1]=0.0; else { y2[1] = -0.5; u[1]=(3.0/(x[2]-x[1]))*((y[2]-y[1])/(x[2]-x[1])-yp1); } for (i=2;i<=n-1;i++) { sig=(x[i]-x[i-1])/(x[i+1]-x[i-1]); p=sig*y2[i-1]+2.0; y2[i]=(sig-1.0)/p; u[i]=(y[i+1]-y[i])/(x[i+1]-x[i]) - (y[i]-y[i-1])/(x[i]-x[i-1]); u[i]=(6.0*u[i]/(x[i+1]-x[i-1])-sig*u[i-1])/p; } if (ypn > 0.99e30) qn=un=0.0; else { qn=0.5; un=(3.0/(x[n]-x[n-1]))*(ypn-(y[n]-y[n-1])/(x[n]-x[n-1])); } y2[n]=(un-qn*u[n-1])/(qn*y2[n-1]+1.0); for (k=n-1;k>=1;k--) y2[k]=y2[k]*y2[k+1]+u[k]; free_vector(u,1,n-1);}#undef NRANSI?? 快捷鍵說明
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