?? bessi1.c
字號(hào):
#include <math.h>float bessi1(float x){ float ax,ans; double y; if ((ax=fabs(x)) < 3.75) { y=x/3.75; y*=y; ans=ax*(0.5+y*(0.87890594+y*(0.51498869+y*(0.15084934 +y*(0.2658733e-1+y*(0.301532e-2+y*0.32411e-3)))))); } else { y=3.75/ax; ans=0.2282967e-1+y*(-0.2895312e-1+y*(0.1787654e-1 -y*0.420059e-2)); ans=0.39894228+y*(-0.3988024e-1+y*(-0.362018e-2 +y*(0.163801e-2+y*(-0.1031555e-1+y*ans)))); ans *= (exp(ax)/sqrt(ax)); } return x < 0.0 ? -ans : ans;}
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