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(calc-det-lu): New variable.

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(math-det-raw, math-det-step): Replace variable lu by declared
variable.
This commit is contained in:
Jay Belanger 2004-11-26 22:36:10 +00:00
parent 3a7a4adb2d
commit 4952f0be95
1 changed files with 7 additions and 4 deletions
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11
lisp/calc/calc-mtx.el
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@ -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.