Comment #63 on issue 1766 by Vinzent.Steinberg: expand(power_base=True) is
too aggressive
http://code.google.com/p/sympy/issues/detail?id=1766
Now I'm only getting 2 failures:
_____________ sympy/core/tests/test_expand.py:test_expand_mul_mult
_____________
File "/home/one/src/sympy/sympy/core/tests/test_expand.py", line 109, in
test_expand_mul_mult
5 + 12*x - 4*x**2 - 11*x**3
AssertionError
________________________________________________________________________________
______ sympy/integrals/tests/test_risch.py:test_heurisch_symbolic_coeffs
_______
File "/home/one/src/sympy/sympy/integrals/tests/test_risch.py", line 121,
in
test_heurisch_symbolic_coeffs
assert equal(heurisch(log(x+y+z), y), -y + log(x+y+z)*(x+y+z))
AssertionError
In [1]: ((1+x)*(x - (1 - x)*(1 +x) + 6*(1 - x)*(1 +2*x))).expand(mul=1)
Out[1]:
2 3
-1 + (1 + 2⋅x)⋅(6 - 6⋅x) + x⋅(1 + 2⋅x)⋅(6 - 6⋅x) + 2⋅x + x
vs. 5 + 12*x - 4*x**2 - 11*x**3
And
In [6]: heurisch(log(x+y+z), y)
Out[6]: -y + x⋅log(x + y + z) + y⋅log(x + y + z) + z⋅log(x + y + z)
vs. equal(..., -y + log(x+y+z)*(x+y+z))
Should be possibly solved by substitution.
A test still hangs, but I don't know which one. Probably it's in
test_ode.py, your
nemesis. :)
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