Status: Accepted
Owner: asmeurer
Labels: Type-Enhancement Priority-Medium
New issue 1941 by asmeurer: Objects that know how to combine themselves
http://code.google.com/p/sympy/issues/detail?id=1941
This is related to issue 1908. When I met with Ondrej last summer, we
worked on a core where
objects knew how to combine themselves with respect to Mul and Add. See
the handler branch at
http://github.com/certik/sympyx/. The idea originally stemmed from issue
1336, but we soon
discovered that it also simplifies the logic for things like O() (the order
function), and oo, which
combine abnormally with respect to Mul and Add. This could also be useful
for issue 1940, so that
the units could tell Mul that they need to stay together without Mul
explicitly having to know about
units. Right now, Mul.flatten is cluttered with code for handling all
these things, and the only way
to handle additional classes is to either completely separate them from
Basic (as with Poly), or to
add more special case code in Mul.flatten.
Anyway, if we ever rework the core as suggested in issue 1908 or elsewhere,
we should also look
into doing this too.
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