[Maxima] smarter factor-if-small function?
robert.dodier at gmail.com
Fri Aug 29 00:47:25 CDT 2008
On 8/28/08, Moshe Looks <madscience at google.com> wrote:
> I have recently begun playing around with maxima for a probabilistic
> program evolution project that requires simplification of random
Hmm, neat. I like hearing about stuff that people are working on with Maxima.
> Some of these expressions use the absolute-value function
> (abs) in a way that seems to lead to bad behavior by the default
> simplifier. For example, doing
> at the maxima prompt gives "MAKE-ARRAY: dimensions (7905 7905)
> produce too large total-size" under clisp, and launches into a long
> (> 10 min) computation under sbcl.
Well, it looks like Maxima's method for factoring is very inefficient for
fractional exponents. I really have no idea how to do it better.
Is there some way to prove that there is no nontrivial factorization for
some class of expressions? (Which includes stuff like -0.2 + x^0.70086.)
Maybe there are better ways to approach the sign determination
problem, but I'm not yet ready to give up factoring.
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