Status: Accepted
Owner: smichr
Labels: Type-Defect Priority-Medium
New issue 1993 by smichr: make sign simlification part of canonicalizing
process
http://code.google.com/p/sympy/issues/detail?id=1993
One thing we can always be sure of with sympy expressions is that args[0]
of an Add or Mul will contain a Number if it is present. Another
standardization that would perhaps be good is to give expressions with the
fewest negative signs when possible. e.g. in a test from my t branch commit
1984 I have this test:
assert ((x - y - v - w)*(x - y - v - 2*w)*(x - y - v - 4*w))**3 == \
-(w + y + v - x)**3*(y + v - x + 2*w)**3*(y + v - x + 4*w)**3
Although this may not help doctest pass (since ordering of like-signed
terms might be different?) it would help with comparing expressions. In
commit 1825 of my t branch at github I introduced a signsimp function that
might help in this regard.
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