From 7ce331c01ce6eb7b3f5c715a38a24359da9c6ee2 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Thu, 22 Nov 2001 14:04:29 +0000
Subject: Totally rework the math library, this time based on the MacOs X math
 library (which is itself based on the math lib from FreeBSD).  -Erik

---
 libm/float/jnf.c | 124 -------------------------------------------------------
 1 file changed, 124 deletions(-)
 delete mode 100644 libm/float/jnf.c

(limited to 'libm/float/jnf.c')

diff --git a/libm/float/jnf.c b/libm/float/jnf.c
deleted file mode 100644
index de358e0ef..000000000
--- a/libm/float/jnf.c
+++ /dev/null
@@ -1,124 +0,0 @@
-/*							jnf.c
- *
- *	Bessel function of integer order
- *
- *
- *
- * SYNOPSIS:
- *
- * int n;
- * float x, y, jnf();
- *
- * y = jnf( n, x );
- *
- *
- *
- * DESCRIPTION:
- *
- * Returns Bessel function of order n, where n is a
- * (possibly negative) integer.
- *
- * The ratio of jn(x) to j0(x) is computed by backward
- * recurrence.  First the ratio jn/jn-1 is found by a
- * continued fraction expansion.  Then the recurrence
- * relating successive orders is applied until j0 or j1 is
- * reached.
- *
- * If n = 0 or 1 the routine for j0 or j1 is called
- * directly.
- *
- *
- *
- * ACCURACY:
- *
- *                      Absolute error:
- * arithmetic   range      # trials      peak         rms
- *    IEEE      0, 15       30000       3.6e-7      3.6e-8
- *
- *
- * Not suitable for large n or x. Use jvf() instead.
- *
- */
-
-/*							jn.c
-Cephes Math Library Release 2.2:  June, 1992
-Copyright 1984, 1987, 1992 by Stephen L. Moshier
-Direct inquiries to 30 Frost Street, Cambridge, MA 02140
-*/
-#include <math.h>
-
-extern float MACHEPF;
-
-float j0f(float), j1f(float);
-
-float jnf( int n, float xx )
-{
-float x, pkm2, pkm1, pk, xk, r, ans, xinv, sign;
-int k;
-
-x = xx;
-sign = 1.0;
-if( n < 0 )
-	{
-	n = -n;
-	if( (n & 1) != 0 )	/* -1**n */
-		sign = -1.0;
-	}
-
-if( n == 0 )
-	return( sign * j0f(x) );
-if( n == 1 )
-	return( sign * j1f(x) );
-if( n == 2 )
-	return( sign * (2.0 * j1f(x) / x  -  j0f(x)) );
-
-/*
-if( x < MACHEPF )
-	return( 0.0 );
-*/
-
-/* continued fraction */
-k = 24;
-pk = 2 * (n + k);
-ans = pk;
-xk = x * x;
-
-do
-	{
-	pk -= 2.0;
-	ans = pk - (xk/ans);
-	}
-while( --k > 0 );
-/*ans = x/ans;*/
-
-/* backward recurrence */
-
-pk = 1.0;
-/*pkm1 = 1.0/ans;*/
-xinv = 1.0/x;
-pkm1 = ans * xinv;
-k = n-1;
-r = (float )(2 * k);
-
-do
-	{
-	pkm2 = (pkm1 * r  -  pk * x) * xinv;
-	pk = pkm1;
-	pkm1 = pkm2;
-	r -= 2.0;
-	}
-while( --k > 0 );
-
-r = pk;
-if( r < 0 )
-	r = -r;
-ans = pkm1;
-if( ans < 0 )
-	ans = -ans;
-
-if( r > ans )  /* if( fabs(pk) > fabs(pkm1) ) */
-	ans = sign * j1f(x)/pk;
-else
-	ans = sign * j0f(x)/pkm1;
-return( ans );
-}
-- 
cgit v1.2.3