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/chdtrf.c | 210 ----------------------------------------------------
 1 file changed, 210 deletions(-)
 delete mode 100644 libm/float/chdtrf.c

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

diff --git a/libm/float/chdtrf.c b/libm/float/chdtrf.c
deleted file mode 100644
index 53bd3d961..000000000
--- a/libm/float/chdtrf.c
+++ /dev/null
@@ -1,210 +0,0 @@
-/*							chdtrf.c
- *
- *	Chi-square distribution
- *
- *
- *
- * SYNOPSIS:
- *
- * float df, x, y, chdtrf();
- *
- * y = chdtrf( df, x );
- *
- *
- *
- * DESCRIPTION:
- *
- * Returns the area under the left hand tail (from 0 to x)
- * of the Chi square probability density function with
- * v degrees of freedom.
- *
- *
- *                                  inf.
- *                                    -
- *                        1          | |  v/2-1  -t/2
- *  P( x | v )   =   -----------     |   t      e     dt
- *                    v/2  -       | |
- *                   2    | (v/2)   -
- *                                   x
- *
- * where x is the Chi-square variable.
- *
- * The incomplete gamma integral is used, according to the
- * formula
- *
- *	y = chdtr( v, x ) = igam( v/2.0, x/2.0 ).
- *
- *
- * The arguments must both be positive.
- *
- *
- *
- * ACCURACY:
- *
- *        Relative error:
- * arithmetic   domain     # trials      peak         rms
- *    IEEE       0,100       5000       3.2e-5      5.0e-6
- *
- * ERROR MESSAGES:
- *
- *   message         condition      value returned
- * chdtrf domain  x < 0 or v < 1        0.0
- */
-/*							chdtrcf()
- *
- *	Complemented Chi-square distribution
- *
- *
- *
- * SYNOPSIS:
- *
- * float v, x, y, chdtrcf();
- *
- * y = chdtrcf( v, x );
- *
- *
- *
- * DESCRIPTION:
- *
- * Returns the area under the right hand tail (from x to
- * infinity) of the Chi square probability density function
- * with v degrees of freedom:
- *
- *
- *                                  inf.
- *                                    -
- *                        1          | |  v/2-1  -t/2
- *  P( x | v )   =   -----------     |   t      e     dt
- *                    v/2  -       | |
- *                   2    | (v/2)   -
- *                                   x
- *
- * where x is the Chi-square variable.
- *
- * The incomplete gamma integral is used, according to the
- * formula
- *
- *	y = chdtr( v, x ) = igamc( v/2.0, x/2.0 ).
- *
- *
- * The arguments must both be positive.
- *
- *
- *
- * ACCURACY:
- *
- *        Relative error:
- * arithmetic   domain     # trials      peak         rms
- *    IEEE       0,100       5000       2.7e-5      3.2e-6
- *
- * ERROR MESSAGES:
- *
- *   message         condition      value returned
- * chdtrc domain  x < 0 or v < 1        0.0
- */
-/*							chdtrif()
- *
- *	Inverse of complemented Chi-square distribution
- *
- *
- *
- * SYNOPSIS:
- *
- * float df, x, y, chdtrif();
- *
- * x = chdtrif( df, y );
- *
- *
- *
- *
- * DESCRIPTION:
- *
- * Finds the Chi-square argument x such that the integral
- * from x to infinity of the Chi-square density is equal
- * to the given cumulative probability y.
- *
- * This is accomplished using the inverse gamma integral
- * function and the relation
- *
- *    x/2 = igami( df/2, y );
- *
- *
- *
- *
- * ACCURACY:
- *
- *        Relative error:
- * arithmetic   domain     # trials      peak         rms
- *    IEEE       0,100       10000      2.2e-5      8.5e-7
- *
- * ERROR MESSAGES:
- *
- *   message         condition      value returned
- * chdtri domain   y < 0 or y > 1        0.0
- *                     v < 1
- *
- */
-
-/*								chdtr() */
-
-
-/*
-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>
-
-#ifdef ANSIC
-float igamcf(float, float), igamf(float, float), igamif(float, float);
-#else
-float igamcf(), igamf(), igamif();
-#endif
-
-float chdtrcf(float dff, float xx)
-{
-float df, x;
-
-df = dff;
-x = xx;
-
-if( (x < 0.0) || (df < 1.0) )
-	{
-	mtherr( "chdtrcf", DOMAIN );
-	return(0.0);
-	}
-return( igamcf( 0.5*df, 0.5*x ) );
-}
-
-
-float chdtrf(float dff, float xx)
-{
-float df, x;
-
-df = dff;
-x = xx;
-if( (x < 0.0) || (df < 1.0) )
-	{
-	mtherr( "chdtrf", DOMAIN );
-	return(0.0);
-	}
-return( igamf( 0.5*df, 0.5*x ) );
-}
-
-
-float chdtrif( float dff, float yy )
-{
-float y, df, x;
-
-y = yy;
-df = dff;
-if( (y < 0.0) || (y > 1.0) || (df < 1.0) )
-	{
-	mtherr( "chdtrif", DOMAIN );
-	return(0.0);
-	}
-
-x = igamif( 0.5 * df, y );
-return( 2.0 * x );
-}
-- 
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