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

1 files changed, 0 insertions, 133 deletions

diff --git a/libm/double/jn.c b/libm/double/jn.c
deleted file mode 100644
index ee05395aa..000000000
--- a/libm/double/jn.c
+++ /dev/null
@@ -1,133 +0,0 @@
-/*							jn.c
- *
- *	Bessel function of integer order
- *
- *
- *
- * SYNOPSIS:
- *
- * int n;
- * double x, y, jn();
- *
- * y = jn( 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
- *    DEC       0, 30        5500       6.9e-17     9.3e-18
- *    IEEE      0, 30        5000       4.4e-16     7.9e-17
- *
- *
- * Not suitable for large n or x. Use jv() instead.
- *
- */
-
-/*							jn.c
-Cephes Math Library Release 2.8:  June, 2000
-Copyright 1984, 1987, 2000 by Stephen L. Moshier
-*/
-#include <math.h>
-#ifdef ANSIPROT
-extern double fabs ( double );
-extern double j0 ( double );
-extern double j1 ( double );
-#else
-double fabs(), j0(), j1();
-#endif
-extern double MACHEP;
-
-double jn( n, x )
-int n;
-double x;
-{
-double pkm2, pkm1, pk, xk, r, ans;
-int k, sign;
-
-if( n < 0 )
-	{
-	n = -n;
-	if( (n & 1) == 0 )	/* -1**n */
-		sign = 1;
-	else
-		sign = -1;
-	}
-else
-	sign = 1;
-
-if( x < 0.0 )
-	{
-	if( n & 1 )
-		sign = -sign;
-	x = -x;
-	}
-
-if( n == 0 )
-	return( sign * j0(x) );
-if( n == 1 )
-	return( sign * j1(x) );
-if( n == 2 )
-	return( sign * (2.0 * j1(x) / x  -  j0(x)) );
-
-if( x < MACHEP )
-	return( 0.0 );
-
-/* continued fraction */
-#ifdef DEC
-k = 56;
-#else
-k = 53;
-#endif
-
-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;
-k = n-1;
-r = 2 * k;
-
-do
-	{
-	pkm2 = (pkm1 * r  -  pk * x) / x;
-	pk = pkm1;
-	pkm1 = pkm2;
-	r -= 2.0;
-	}
-while( --k > 0 );
-
-if( fabs(pk) > fabs(pkm1) )
-	ans = j1(x)/pk;
-else
-	ans = j0(x)/pkm1;
-return( sign * ans );
-}