From: Jay Belanger <jay.p.belanger@gmail.com>
Date: Tue, 14 Feb 2006 21:39:26 +0000 (+0000)
Subject: (math-integrate-by-parts): Do a more careful test to see if equation
X-Git-Tag: emacs-pretest-22.0.90~4130
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=63f7edace755ddb71ba842b55bafa98e55a2e768;p=emacs.git

(math-integrate-by-parts): Do a more careful test to see if equation
can be solved.
---

diff --git a/lisp/calc/calcalg2.el b/lisp/calc/calcalg2.el
index facb691c08b..f71e58e223a 100644
--- a/lisp/calc/calcalg2.el
+++ b/lisp/calc/calcalg2.el
@@ -1253,9 +1253,11 @@
 			(calcFunc-expand temp)
 		      (setq v (list 'var 'PARTS math-cur-record)
 			    temp (let (calc-next-why)
-				   (math-solve-for (math-sub v temp) 0 v nil)))
-		      (and temp (not (integerp temp))
-			   (math-simplify-extended temp)))))
+                                   (math-simplify-extended
+                                    (math-solve-for (math-sub v temp) 0 v nil)))
+                            temp (if (and (eq (car-safe temp) '/) 
+                                          (math-zerop (nth 2 temp))) 
+                                     nil temp)))))
 	   (setcar (cdr math-cur-record) 'busy)))))
 
 ;;; This tries two different formulations, hoping the algebraic simplifier