?? xchebev.c
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/* Driver for routine chebev */#include <stdio.h>#include <math.h>#define NRANSI#include "nr.h"#define NVAL 40#define PIO2 1.5707963float func(float x){ return x*x*(x*x-2.0)*sin(x);}int main(void){ int i,mval; float a=(-PIO2),b=PIO2,x,c[NVAL]; chebft(a,b,c,NVAL,func); /* Test Chebyshev evaluation routine */ for (;;) { printf("\nHow many terms in Chebyshev evaluation?\n"); printf("Enter n between 6 and %2d. (n=0 to end).\n",NVAL); scanf("%d",&mval); if ((mval <= 0) || (mval > NVAL)) break; printf("\n%9s %14s %16s \n","x","actual","chebyshev fit"); for (i = -8;i<=8;i++) { x=i*PIO2/10.0; printf("%12.6f %12.6f %12.6f\n", x,func(x),chebev(a,b,c,mval,x)); } } return 0;}#undef NRANSI?? 快捷鍵說明
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