From: Chris Dams <Chris.Dams@mi.infn.it>
Date: Tue, 4 Apr 2006 14:11:21 +0000 (+0000)
Subject: Fix bug in differentiation of a power.
X-Git-Tag: release_1-4-0~100
X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=commitdiff_plain;h=2893c8e04685b99317384ff02a0fefc899f499f9;ds=sidebyside

Fix bug in differentiation of a power.
---

diff --git a/ginac/power.cpp b/ginac/power.cpp
index 95a01ace..0ebc8dc2 100644
--- a/ginac/power.cpp
+++ b/ginac/power.cpp
@@ -620,7 +620,7 @@ ex power::conjugate() const
  *  @see ex::diff */
 ex power::derivative(const symbol & s) const
 {
-	if (exponent.info(info_flags::real)) {
+	if (is_a<numeric>(exponent)) {
 		// D(b^r) = r * b^(r-1) * D(b) (faster than the formula below)
 		epvector newseq;
 		newseq.reserve(2);