Updates:
Status: Started
Owner: mattpap
Cc: -mattpap
Labels: Milestone-Release0.7.0
Comment #2 on issue 1899 by mattpap: factor(3 + x - x*(1 + x) + x**2) != 3
http://code.google.com/p/sympy/issues/detail?id=1899
This behavior of factor() is just a simple bug. In a moment I'm going for a
plane to
Reno (NV), so I will fix it when I arrive there (the fix will be available
in polys9).
Should factor(p + q), where p and q are already factored, try to expand
and
refactor the whole thing?
I think it should, as factor() by its definition should do its best to
return Mul and
return Add only when the input polynomial is irreducible over the specified
domain.
Maybe we should add another function, factor_terms(), to apply factor() on
each term
alone in an Add. Actually, I planned to add a general function for this
purpose, say
use() (or something, but apply() is built-in), to use a certain function on
specified
parts of a larger expression. For example use(factor, level=1) would apply
factor()
to elements of Add.
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