?? rc.c
字號(hào):
#include <math.h>#define NRANSI#include "nrutil.h"#define ERRTOL 0.04#define TINY 1.69e-38#define SQRTNY 1.3e-19#define BIG 3.e37#define TNBG (TINY*BIG)#define COMP1 (2.236/SQRTNY)#define COMP2 (TNBG*TNBG/25.0)#define THIRD (1.0/3.0)#define C1 0.3#define C2 (1.0/7.0)#define C3 0.375#define C4 (9.0/22.0)float rc(float x, float y){ float alamb,ave,s,w,xt,yt; if (x < 0.0 || y == 0.0 || (x+fabs(y)) < TINY || (x+fabs(y)) > BIG || (y<-COMP1 && x > 0.0 && x < COMP2)) nrerror("invalid arguments in rc"); if (y > 0.0) { xt=x; yt=y; w=1.0; } else { xt=x-y; yt = -y; w=sqrt(x)/sqrt(xt); } do { alamb=2.0*sqrt(xt)*sqrt(yt)+yt; xt=0.25*(xt+alamb); yt=0.25*(yt+alamb); ave=THIRD*(xt+yt+yt); s=(yt-ave)/ave; } while (fabs(s) > ERRTOL); return w*(1.0+s*s*(C1+s*(C2+s*(C3+s*C4))))/sqrt(ave);}#undef ERRTOL#undef TINY#undef SQRTNY#undef BIG#undef TNBG#undef COMP1#undef COMP2#undef THIRD#undef C1#undef C2#undef C3#undef C4#undef NRANSI?? 快捷鍵說(shuō)明
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