author | convert-repo |
Tue, 31 Dec 2019 04:28:27 +0000 | |
changeset 3995 | d65488cfad3c |
parent 2380 | 9195eccdcbd9 |
permissions | -rw-r--r-- |
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Updated to https://swing.fit.cvut.cz/hg/stx.libjava/rev/31f8b995905e
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/* @(#)w_jn.c 1.3 95/01/18 */ |
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/* |
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* ==================================================== |
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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* |
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* Developed at SunSoft, a Sun Microsystems, Inc. business. |
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* Permission to use, copy, modify, and distribute this |
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* software is freely granted, provided that this notice |
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* is preserved. |
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* ==================================================== |
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*/ |
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|
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/* |
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* wrapper jn(int n, double x), yn(int n, double x) |
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* floating point Bessel's function of the 1st and 2nd kind |
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* of order n |
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* |
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* Special cases: |
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* y0(0)=y1(0)=yn(n,0) = -inf with division by zero signal; |
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* y0(-ve)=y1(-ve)=yn(n,-ve) are NaN with invalid signal. |
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* Note 2. About jn(n,x), yn(n,x) |
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* For n=0, j0(x) is called, |
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* for n=1, j1(x) is called, |
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* for n<x, forward recursion us used starting |
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* from values of j0(x) and j1(x). |
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* for n>x, a continued fraction approximation to |
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* j(n,x)/j(n-1,x) is evaluated and then backward |
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* recursion is used starting from a supposed value |
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* for j(n,x). The resulting value of j(0,x) is |
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* compared with the actual value to correct the |
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* supposed value of j(n,x). |
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* |
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* yn(n,x) is similar in all respects, except |
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* that forward recursion is used for all |
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* values of n>1. |
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* |
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*/ |
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|
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#include "fdlibm.h" |
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|
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#ifdef __STDC__ |
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double jn(int n, double x) /* wrapper jn */ |
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#else |
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double jn(n,x) /* wrapper jn */ |
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double x; int n; |
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#endif |
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{ |
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#ifdef _IEEE_LIBM |
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return __ieee754_jn(n,x); |
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#else |
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double z; |
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z = __ieee754_jn(n,x); |
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if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z; |
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if(fabs(x)>X_TLOSS) { |
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return __kernel_standard((double)n,x,38); /* jn(|x|>X_TLOSS,n) */ |
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} else |
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return z; |
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#endif |
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} |
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|
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#ifdef __STDC__ |
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double yn(int n, double x) /* wrapper yn */ |
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#else |
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double yn(n,x) /* wrapper yn */ |
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double x; int n; |
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#endif |
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{ |
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#ifdef _IEEE_LIBM |
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return __ieee754_yn(n,x); |
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#else |
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double z; |
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z = __ieee754_yn(n,x); |
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if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z; |
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if(x <= 0.0){ |
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if(x==0.0) |
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/* d= -one/(x-x); */ |
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return __kernel_standard((double)n,x,12); |
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else |
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/* d = zero/(x-x); */ |
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return __kernel_standard((double)n,x,13); |
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} |
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if(x>X_TLOSS) { |
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return __kernel_standard((double)n,x,39); /* yn(x>X_TLOSS,n) */ |
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} else |
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return z; |
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#endif |
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} |