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/ndtrif.c | 186 ----------------------------------------------------
 1 file changed, 186 deletions(-)
 delete mode 100644 libm/float/ndtrif.c

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

diff --git a/libm/float/ndtrif.c b/libm/float/ndtrif.c
deleted file mode 100644
index 3e33bc2c5..000000000
--- a/libm/float/ndtrif.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/*							ndtrif.c
- *
- *	Inverse of Normal distribution function
- *
- *
- *
- * SYNOPSIS:
- *
- * float x, y, ndtrif();
- *
- * x = ndtrif( y );
- *
- *
- *
- * DESCRIPTION:
- *
- * Returns the argument, x, for which the area under the
- * Gaussian probability density function (integrated from
- * minus infinity to x) is equal to y.
- *
- *
- * For small arguments 0 < y < exp(-2), the program computes
- * z = sqrt( -2.0 * log(y) );  then the approximation is
- * x = z - log(z)/z  - (1/z) P(1/z) / Q(1/z).
- * There are two rational functions P/Q, one for 0 < y < exp(-32)
- * and the other for y up to exp(-2).  For larger arguments,
- * w = y - 0.5, and  x/sqrt(2pi) = w + w**3 R(w**2)/S(w**2)).
- *
- *
- * ACCURACY:
- *
- *                      Relative error:
- * arithmetic   domain        # trials      peak         rms
- *    IEEE     1e-38, 1        30000       3.6e-7      5.0e-8
- *
- *
- * ERROR MESSAGES:
- *
- *   message         condition    value returned
- * ndtrif domain      x <= 0        -MAXNUM
- * ndtrif domain      x >= 1         MAXNUM
- *
- */
-
-
-/*
-Cephes Math Library Release 2.2:  July, 1992
-Copyright 1984, 1987, 1989, 1992 by Stephen L. Moshier
-Direct inquiries to 30 Frost Street, Cambridge, MA 02140
-*/
-
-#include <math.h>
-extern float MAXNUMF;
-
-/* sqrt(2pi) */
-static float s2pi = 2.50662827463100050242;
-
-/* approximation for 0 <= |y - 0.5| <= 3/8 */
-static float P0[5] = {
--5.99633501014107895267E1,
- 9.80010754185999661536E1,
--5.66762857469070293439E1,
- 1.39312609387279679503E1,
--1.23916583867381258016E0,
-};
-static float Q0[8] = {
-/* 1.00000000000000000000E0,*/
- 1.95448858338141759834E0,
- 4.67627912898881538453E0,
- 8.63602421390890590575E1,
--2.25462687854119370527E2,
- 2.00260212380060660359E2,
--8.20372256168333339912E1,
- 1.59056225126211695515E1,
--1.18331621121330003142E0,
-};
-
-/* Approximation for interval z = sqrt(-2 log y ) between 2 and 8
- * i.e., y between exp(-2) = .135 and exp(-32) = 1.27e-14.
- */
-static float P1[9] = {
- 4.05544892305962419923E0,
- 3.15251094599893866154E1,
- 5.71628192246421288162E1,
- 4.40805073893200834700E1,
- 1.46849561928858024014E1,
- 2.18663306850790267539E0,
--1.40256079171354495875E-1,
--3.50424626827848203418E-2,
--8.57456785154685413611E-4,
-};
-static float Q1[8] = {
-/*  1.00000000000000000000E0,*/
- 1.57799883256466749731E1,
- 4.53907635128879210584E1,
- 4.13172038254672030440E1,
- 1.50425385692907503408E1,
- 2.50464946208309415979E0,
--1.42182922854787788574E-1,
--3.80806407691578277194E-2,
--9.33259480895457427372E-4,
-};
-
-
-/* Approximation for interval z = sqrt(-2 log y ) between 8 and 64
- * i.e., y between exp(-32) = 1.27e-14 and exp(-2048) = 3.67e-890.
- */
-
-static float P2[9] = {
-  3.23774891776946035970E0,
-  6.91522889068984211695E0,
-  3.93881025292474443415E0,
-  1.33303460815807542389E0,
-  2.01485389549179081538E-1,
-  1.23716634817820021358E-2,
-  3.01581553508235416007E-4,
-  2.65806974686737550832E-6,
-  6.23974539184983293730E-9,
-};
-static float Q2[8] = {
-/*  1.00000000000000000000E0,*/
-  6.02427039364742014255E0,
-  3.67983563856160859403E0,
-  1.37702099489081330271E0,
-  2.16236993594496635890E-1,
-  1.34204006088543189037E-2,
-  3.28014464682127739104E-4,
-  2.89247864745380683936E-6,
-  6.79019408009981274425E-9,
-};
-
-#ifdef ANSIC
-float polevlf(float, float *, int);
-float p1evlf(float, float *, int);
-float logf(float), sqrtf(float);
-#else
-float polevlf(), p1evlf(), logf(), sqrtf();
-#endif
-
-
-float ndtrif(float yy0)
-{
-float y0, x, y, z, y2, x0, x1;
-int code;
-
-y0 = yy0;
-if( y0 <= 0.0 )
-	{
-	mtherr( "ndtrif", DOMAIN );
-	return( -MAXNUMF );
-	}
-if( y0 >= 1.0 )
-	{
-	mtherr( "ndtrif", DOMAIN );
-	return( MAXNUMF );
-	}
-code = 1;
-y = y0;
-if( y > (1.0 - 0.13533528323661269189) ) /* 0.135... = exp(-2) */
-	{
-	y = 1.0 - y;
-	code = 0;
-	}
-
-if( y > 0.13533528323661269189 )
-	{
-	y = y - 0.5;
-	y2 = y * y;
-	x = y + y * (y2 * polevlf( y2, P0, 4)/p1evlf( y2, Q0, 8 ));
-	x = x * s2pi; 
-	return(x);
-	}
-
-x = sqrtf( -2.0 * logf(y) );
-x0 = x - logf(x)/x;
-
-z = 1.0/x;
-if( x < 8.0 ) /* y > exp(-32) = 1.2664165549e-14 */
-	x1 = z * polevlf( z, P1, 8 )/p1evlf( z, Q1, 8 );
-else
-	x1 = z * polevlf( z, P2, 8 )/p1evlf( z, Q2, 8 );
-x = x0 - x1;
-if( code != 0 )
-	x = -x;
-return( x );
-}
-- 
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