Updates:
Labels: NeedsReview
Comment #9 on issue 2132 by mattpap: Derivative of RootSum
http://code.google.com/p/sympy/issues/detail?id=2132
In 74cd9297f0df1df6bbdeaf12616d62dd71141a0f support for auto-simplification
of rational functions was added to RootSum, e.g.:
In [1]: %time RootSum(x**5 - x + 1, Lambda(z, z*log(x - z))).diff(x)
CPU times: user 1.22 s, sys: 0.00 s, total: 1.22 s
Wall time: 1.22 s
Out[2]:
-(-4⋅x + 5)
───────────
5
x - x + 1
The algorithm is a bit slow. Further speed improvements are possible, just
Frac() has to be implemented or expand() and related stuff fixed.
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