Comment #15 on issue 4096 by [email protected]: Poly.coeff works only
after .simply().expand()
http://code.google.com/p/sympy/issues/detail?id=4096
Either as a flag to coeff, or maybe a new function (or method) coefficient.
Probably a better way to actually implement it would be to do it
recursively. For example, coefficient(a + b, x, n) would be coefficient(a,
x, n) + coefficient(b, x, n), coefficient(a**m, x, n) would be
coefficient(a, x, n/m), and so on (the hardest one would be Mul). You could
even dispatch it (i.e., implement Add._eval_coefficient and
Pow._eval_coefficient, and so on).
Actually, I wouldn't be surprised if this basic functionality already
exists in some form, so the first thing to do would probably be to check
that first. I suspect you could somehow achieve the same thing roughly as
efficiently using the series code somehow.
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