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/ldouble/arcdotl.c | 108 -------------------------------------------------
 1 file changed, 108 deletions(-)
 delete mode 100644 libm/ldouble/arcdotl.c

(limited to 'libm/ldouble/arcdotl.c')

diff --git a/libm/ldouble/arcdotl.c b/libm/ldouble/arcdotl.c
deleted file mode 100644
index 952f027c6..000000000
--- a/libm/ldouble/arcdotl.c
+++ /dev/null
@@ -1,108 +0,0 @@
-/*							arcdot.c
- *
- *	Angle between two vectors
- *
- *
- *
- *
- * SYNOPSIS:
- *
- * long double p[3], q[3], arcdotl();
- *
- * y = arcdotl( p, q );
- *
- *
- *
- * DESCRIPTION:
- *
- * For two vectors p, q, the angle A between them is given by
- *
- *      p.q / (|p| |q|)  = cos A  .
- *
- * where "." represents inner product, "|x|" the length of vector x.
- * If the angle is small, an expression in sin A is preferred.
- * Set r = q - p.  Then
- *
- *     p.q = p.p + p.r ,
- *
- *     |p|^2 = p.p ,
- *
- *     |q|^2 = p.p + 2 p.r + r.r ,
- *
- *                  p.p^2 + 2 p.p p.r + p.r^2
- *     cos^2 A  =  ----------------------------
- *                    p.p (p.p + 2 p.r + r.r)
- *
- *                  p.p + 2 p.r + p.r^2 / p.p
- *              =  --------------------------- ,
- *                     p.p + 2 p.r + r.r
- *
- *     sin^2 A  =  1 - cos^2 A
- *
- *                   r.r - p.r^2 / p.p
- *              =  --------------------
- *                  p.p + 2 p.r + r.r
- *
- *              =   (r.r - p.r^2 / p.p) / q.q  .
- *
- * ACCURACY:
- *
- * About 1 ULP.  See arcdot.c.
- *
- */
-
-/*
-Cephes Math Library Release 2.3:  November, 1995
-Copyright 1995 by Stephen L. Moshier
-*/
-
-#include <math.h>
-#ifdef ANSIPROT
-extern long double sqrtl ( long double );
-extern long double acosl ( long double );
-extern long double asinl ( long double );
-extern long double atanl ( long double );
-#else
-long double sqrtl(), acosl(), asinl(), atanl();
-#endif
-extern long double PIL;
-
-long double arcdotl(p,q)
-long double p[], q[];
-{
-long double pp, pr, qq, rr, rt, pt, qt, pq;
-int i;
-
-pq = 0.0L;
-qq = 0.0L;
-pp = 0.0L;
-pr = 0.0L;
-rr = 0.0L;
-for (i=0; i<3; i++)
-  {
-    pt = p[i];
-    qt = q[i];
-    pq += pt * qt;
-    qq += qt * qt;
-    pp += pt * pt;
-    rt = qt - pt;
-    pr += pt * rt;
-    rr += rt * rt;
-  }
-if (rr == 0.0L || pp == 0.0L || qq == 0.0L)
-  return 0.0L;
-rt = (rr - (pr * pr) / pp) / qq;
-if (rt <= 0.75L)
-  {
-    rt = sqrtl(rt);
-    qt = asinl(rt);
-    if (pq < 0.0L)
-      qt = PIL - qt;
-  }
-else
-  {
-    pt = pq / sqrtl(pp*qq);
-    qt = acosl(pt);
-  }
-return qt;
-}
-- 
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