Indeed that seems to work just fine for me so I don't have a need for a patch to the pattern matching. It looks like sympy wins over maxima for me due to ease of use and the fact that it is pure python.
Thanks for the package, John. On Apr 14, 4:07 pm, "Mateusz Paprocki" <[EMAIL PROTECTED]> wrote: > Hi, > > the same factorization can be computed using collect(), eg.: > > In [1]: from sympy.abc import mu, gamma > > In [2]: f = (- gamma * (x-mu)**2 - log(gamma) + log(2*pi)) / 2 > > In [3]: collect(f.expand(), x, evaluate=False) > Out[3]: > ⎧ 2⎫ > ⎜ 2 -γ log(2) log(π) log(γ) γ*μ ⎟ > ⎨x : ──, x: γ*μ, 1: ────── + ────── - ────── - ────⎬ > ⎜ 2 2 2 2 2 ⎟ > ⎩ ⎭ > > In [4]: collect(f.expand(), mu, evaluate=False) > Out[4]: > ⎧ 2⎫ > ⎜ 2 -γ log(2) log(π) log(γ) γ*x ⎟ > ⎨μ: γ*x, μ : ──, 1: ────── + ────── - ────── - ────⎬ > ⎜ 2 2 2 2 2 ⎟ > ⎩ ⎭ > > In [5]: collect(f.expand(), [gamma, log(gamma)], evaluate=False) > Out[5]: > ⎧ 2 2 ⎫ > ⎜ log(2) log(π) μ x ⎟ > ⎨1: ────── + ──────, γ: μ*x - ── - ──, log(γ): -1/2⎬ > ⎜ 2 2 2 2 ⎟ > ⎩ ⎭ > > Mateusz > > 2008/4/14, Ondrej Certik <[EMAIL PROTECTED]>: > > > > > On Mon, Apr 14, 2008 at 2:46 PM, [EMAIL PROTECTED] > > <[EMAIL PROTECTED]> wrote: > > > > Well at least now I feel productive in helping to improve sympy. How > > > long does it normally take to get this sort of thing fixed? I need to > > > decide whether to use maxima or sympy in the next few days. I > > > understand this may not be an easy to answer question though. > > > If you submit a patch, it's fixed immedatelly, if not, then it > > depends, but if this is the only problem you have with sympy, I'll try > > to fix it today. > > > What are you going to use maxima/sympy for? What exact features do you > > need? You may also consider Sage, that wraps maxima and you can use it > > from python. However, I am not sure whether they wrapped maxima's > > pattern matching. > > > Ondrej --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sympy?hl=en -~----------~----~----~----~------~----~------~--~---
