Comment #9 on issue 1827 by smichr: log eval gives more standard form
http://code.google.com/p/sympy/issues/detail?id=1827
The code has been moved to log_expand rather than being automatic in eval.
A limit of 10,000 has been set on the factors; on my slow machine that
means Aaron's
example of the baboon at the keyboard takes only 2 seconds to report a sum
of 2 terms
(11 and a big non-prime) ;-)
Also, there is nothing to prevent someone from typing
log(2**9182340981273490812734,
2) which should be instantaneous in reporting the exponent but hangs on my
machine
because sympy tries (I imagine) to evaluate the power before doing the log.
Perhaps
an issue could be opened?
Regarding logcombine, if this patch is not accepted then maybe someone
could work
over logcombine so the following would work:
from sympy import *
var('x')
x
logcombine(x*log(10)-x*(log(2)+log(5)))
x*log(10) - x*log(2) - x*log(5)
collect(_,x)
x*(-log(2) - log(5) + log(10))
logcombine(_)
x*log(10) - x*log(2) - x*log(5)
_.expand() # this does the log simplification
0
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