fix bug in poly.minus

971dc53f · Guido van Rossum · 05bf280d · 971dc53f
Commit 971dc53f authored Oct 20, 1994 by Guido van Rossum
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Showing with 2 additions and 5 deletions

Lib/poly.py Lib/poly.py +2 -5

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--- 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
+	neg_b = map(lambda x: -x, b[:])
-	res = a[:] # make a copy
+	return plus(a, neg_b)
-	for i in range(len(b)):
-		res[i] = res[i] - b[i]
-	return normalize(res)
 def one(power, coeff): # Representation of coeff * x**power
 	res = []