From: Jay Belanger <jay.p.belanger@gmail.com>
Date: Fri, 26 Nov 2004 22:36:10 +0000 (+0000)
Subject: (calc-det-lu): New variable.
X-Git-Tag: ttn-vms-21-2-B4~3634
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=4952f0be950fda61cb64190df16047fb3f84b092;p=emacs.git

(calc-det-lu): New variable.
(math-det-raw, math-det-step): Replace variable lu by declared
variable.
---

diff --git a/lisp/calc/calc-mtx.el b/lisp/calc/calc-mtx.el
index 99442d4d33d..762be985dfa 100644
--- a/lisp/calc/calc-mtx.el
+++ b/lisp/calc/calc-mtx.el
@@ -3,8 +3,7 @@
 ;; Copyright (C) 1990, 1991, 1992, 1993, 2001 Free Software Foundation, Inc.
 
 ;; Author: David Gillespie <daveg@synaptics.com>
-;; Maintainers: D. Goel <deego@gnufans.org>
-;;              Colin Walters <walters@debian.org>
+;; Maintainer: Jay Belanger <belanger@truman.edu>
 
 ;; This file is part of GNU Emacs.
 
@@ -176,6 +175,10 @@
 	(nth 1 m)
       (math-reject-arg m 'square-matrixp))))
 
+;; The variable math-det-lu is local to math-det-raw, but is
+;; used by math-det-step, which is called by math-det-raw.
+(defvar math-det-lu)
+
 (defun math-det-raw (m)
   (let ((n (1- (length m))))
     (cond ((= n 1)
@@ -211,13 +214,13 @@
 				(nth 3 (nth 3 m))))))
 	  (t (let ((lud (math-matrix-lud m)))
 	       (if lud
-		   (let ((lu (car lud)))
+		   (let ((math-det-lu (car lud)))
 		     (math-det-step n (nth 2 lud)))
 		 0))))))
 
 (defun math-det-step (n prod)
   (if (> n 0)
-      (math-det-step (1- n) (math-mul prod (nth n (nth n lu))))
+      (math-det-step (1- n) (math-mul prod (nth n (nth n math-det-lu))))
     prod))
 
 ;;; This returns a list (LU index d), or nil if not possible.