Hi Maurizio,
On Fri, 20 Feb 2009 16:21:36 -0800 (PST)
Maurizio <[email protected]> wrote:
> unfortunately, I don't have the code with me right now (I could give
> you on monday), but I'm pretty sure it is something REALLY
> straightforward and not optimized, like this:
>
> def coll(expr,s):
> import sympy as sp
> spexpr = sp.sympify(expand(expr))
> temp = sp.collect(spexpr,s)
> return temp._sage_()
>
> var('a b c s')
> prova = a*s + (b+s)*c
>
> coll(prova,s)
> (c + a)*s + b*c
Note that Pynac based symbolics already provides this functionality.
sage: var('a b c s',ns=1)
(a, b, c, s)
sage: prova = a*s + (b+s)*c
sage: prova.collect(s)
(a + c)*s + b*c
I hope to start the switch to use pynac as the default backend for
symbolics soon, but I'm still reluctant to give a time frame.
As to your original remark:
> I am wondering what do you think about simplifying the access and use
> of the external packages to accomplish some very simple operations. I
> first say that I do intensive use of plot and symbolic analysis
> (calculus) routines.
Please point out other functionality that you think should be exposed
through a better interface. I agree that we should do a better job in
this area.
Cheers,
Burcin
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