Comment #3 on issue 3862 by smi...@gmail.com: rcollect doesn't work as
expected
http://code.google.com/p/sympy/issues/detail?id=3862
It just runs collect on the arguments. One thing that can be done is to run
it again if the first pass changes the expression. The attached patch
generates something different than horner for the OP expression:
(a0*(a1*(a2 + a4*(a2*a3 + 1)) + a3*a4 + 1) + a2*(a3*a4 + 1) + a4)
-----------------------------------------------------------------
(a1*(a2*(a3*a4 + 1) + a4) + a3*a4 + 1)
Attachments:
a.patch 785 bytes
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