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/igamif.c | 112 ----------------------------------------------------
 1 file changed, 112 deletions(-)
 delete mode 100644 libm/float/igamif.c

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

diff --git a/libm/float/igamif.c b/libm/float/igamif.c
deleted file mode 100644
index 5a33b4982..000000000
--- a/libm/float/igamif.c
+++ /dev/null
@@ -1,112 +0,0 @@
-/*							igamif()
- *
- *      Inverse of complemented imcomplete gamma integral
- *
- *
- *
- * SYNOPSIS:
- *
- * float a, x, y, igamif();
- *
- * x = igamif( a, y );
- *
- *
- *
- * DESCRIPTION:
- *
- * Given y, the function finds x such that
- *
- *  igamc( a, x ) = y.
- *
- * Starting with the approximate value
- *
- *         3
- *  x = a t
- *
- *  where
- *
- *  t = 1 - d - ndtri(y) sqrt(d)
- * 
- * and
- *
- *  d = 1/9a,
- *
- * the routine performs up to 10 Newton iterations to find the
- * root of igamc(a,x) - y = 0.
- *
- *
- * ACCURACY:
- *
- * Tested for a ranging from 0 to 100 and x from 0 to 1.
- *
- *                      Relative error:
- * arithmetic   domain     # trials      peak         rms
- *    IEEE      0,100         5000       1.0e-5      1.5e-6
- *
- */
-
-/*
-Cephes Math Library Release 2.2:  July, 1992
-Copyright 1984, 1987, 1992 by Stephen L. Moshier
-Direct inquiries to 30 Frost Street, Cambridge, MA 02140
-*/
-
-#include <math.h>
-
-extern float MACHEPF, MAXLOGF;
-
-#define fabsf(x) ( (x) < 0 ? -(x) : (x) )
-
-#ifdef ANSIC
-float igamcf(float, float);
-float ndtrif(float), expf(float), logf(float), sqrtf(float), lgamf(float);
-#else
-float igamcf();
-float ndtrif(), expf(), logf(), sqrtf(), lgamf();
-#endif
-
-
-float igamif( float aa, float yy0 )
-{
-float a, y0, d, y, x0, lgm;
-int i;
-
-a = aa;
-y0 = yy0;
-/* approximation to inverse function */
-d = 1.0/(9.0*a);
-y = ( 1.0 - d - ndtrif(y0) * sqrtf(d) );
-x0 = a * y * y * y;
-
-lgm = lgamf(a);
-
-for( i=0; i<10; i++ )
-	{
-	if( x0 <= 0.0 )
-		{
-		mtherr( "igamif", UNDERFLOW );
-		return(0.0);
-		}
-	y = igamcf(a,x0);
-/* compute the derivative of the function at this point */
-	d = (a - 1.0) * logf(x0) - x0 - lgm;
-	if( d < -MAXLOGF )
-		{
-		mtherr( "igamif", UNDERFLOW );
-		goto done;
-		}
-	d = -expf(d);
-/* compute the step to the next approximation of x */
-	if( d == 0.0 )
-		goto done;
-	d = (y - y0)/d;
-	x0 = x0 - d;
-	if( i < 3 )
-		continue;
-	if( fabsf(d/x0) < (2.0 * MACHEPF) )
-		goto done;
-	}
-
-done:
-return( x0 );
-}
-- 
cgit v1.2.3