Comment #9 on issue 2265 by [email protected]: cse requires subexpressions
to be in the exact same order
http://code.google.com/p/sympy/issues/detail?id=2265
It turns out that it's not that bad to check for such sub-matches:
h[1] >>> cse([a + c + e, a + c + b])
([(x0, a + c)], [e + x0, b + x0])
A, B, C = symbols('A B C', commutative=False)
l = [A*B*C, A*C]
assert cse(l) == ([], l)
l = [A*B*C, A*B]
assert cse(l) == ([(x0, A*B)], [x0*C, x0])
If you could forward comments regarding cse, that would be helpful. Getting
powers to work is not so simple.
@XFAIL
def test_powers():
assert cse(x*y**2 + x*y) == ([(x0, x*y)], [x0*y + x0])
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