Updates:
Status: Accepted
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Comment #1 on issue 1319 by ondrej.certik: constants left out in matching
d/dx(g(x)*dy/dx)
http://code.google.com/p/sympy/issues/detail?id=1319
Thanks for the bug report, try the newest git sympy, here is what I got:
In [1]: a, b, c = Wild("a"), Wild("b"), Wild("c")
In [2]: eq = diff(g(x)*f(x).diff(x),x)
In [3]: eq.match(g(x).diff(x)*f(x).diff(x)+g(x)*f(x).diff(x,x)+c)
Out[3]: {c: 0}
In [4]: eq.match(a*g(x).diff(x)*f(x).diff(x)+b*g(x)*f(x).diff(x,x)+c)
Out[4]:
⎧ d d d d ⎫
⎨a: 1, b: 1, c: ──(g(x))⋅──(f(x)) - ──(f(x))⋅──(g(x))⎬
⎩ dx dx dx dx ⎭
It's almost right, even though it's funny it can't simplify the thing
for "c". Thanks
for the bug report. If you have time to debug it, it'd be awesome.
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