Status: Accepted
Owner: smichr
Labels: Type-Defect Priority-Medium
New issue 1826 by smichr: oo matching problem
http://code.google.com/p/sympy/issues/detail?id=1826
When doing a match it seems that if some values are returned in the match
dictionary then *all* terms should appear in the dictionary. This is not
happening with the following pattern(s). In addition, a value of nan is
coming back even though it need not do so (as far as I can tell):
from sympy import *
a, b, c, p = map(Wild, 'abcp')
d=S(3)
d.match(a + b*c**p)
{c_: 3, a_: 0, b_: 1, p_: 1}
That one was ok: the parts of the pattern that don't match are 0.
But now,
d=oo
d.match(a + b*c**p)
{c_: nan, a_: oo, p_: 1} <<< b is missing
d.match(a + b)
{a_: nan, b_: oo}
d.match(a )
{a_: oo}
d.match(a + b*c)
{c_: nan, a_: oo} <<< b is missing again
d.match(b*c)
{c_: oo, b_: nan} <<< couldn't this be a 1 for b_?
d.match(b*c**p)
{c_: oo, b_: nan, p_: 1} <<< again, just a 1 for b_?
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