From: Guido van Rossum <guido@python.org>
Date: Thu, 20 Oct 1994 22:02:03 +0000 (+0000)
Subject: fix bug in poly.minus
X-Git-Tag: v1.1.1~27
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=971dc53f0ede0945dda9471596e4c727ea23dc7c;p=thirdparty%2FPython%2Fcpython.git

fix bug in poly.minus
---

diff --git a/Lib/poly.py b/Lib/poly.py
index 3a21904c18d3..57bd2032d4cf 100644
--- a/Lib/poly.py
+++ b/Lib/poly.py
@@ -20,11 +20,8 @@ def plus(a, b):
 	return normalize(res)
 
 def minus(a, b):
-	if len(a) < len(b): a, b = b, a # make sure a is the longest
-	res = a[:] # make a copy
-	for i in range(len(b)):
-		res[i] = res[i] - b[i]
-	return normalize(res)
+	neg_b = map(lambda x: -x, b[:])
+	return plus(a, neg_b)
 
 def one(power, coeff): # Representation of coeff * x**power
 	res = []