That sounds good, but what do you mean by
"write a sympy code that orders the list of arguments of the Add instance
above, which it is easy -- you just order it with respect to 's'"
I understand that that is what I want to do, but how do I get started coding
it up?
On Mon, Jun 1, 2009 at 3:29 PM, Ondrej Certik <ond...@certik.cz> wrote:
>
> On Mon, Jun 1, 2009 at 2:24 PM, Ryan Krauss <ryanli...@gmail.com> wrote:
> > I have a sympy result:
> >
> > In [57]: x1_res_up
> > Out[57]: Gc*k*xd/(Gc*k + k*m1*s**2 + k*m2*s**2 + m1*m2*s**4)
> >
> > In [58]: type(x1_res_up)
> > Out[58]: <class 'sympy.core.mul.Mul'>
> >
> > but I would like the denominator to print in decending powers of s:
> >
> > Gc*k*xd/(m1*m2*s**4 + k*m2*s**2 + Gc*k + k*m1*s**2)
> >
> > If the numerator had powers of s, I would like it to print the same way.
> > The result is a Laplace transform and this is how my readers are used to
> > looking at them. Most importantly, this is the order I want them to be
> in
> > when they are converted to Latex. Can this be done? Am I missing a
> simple
> > keyword argument somewhere? Maxima has an option that is something like
> > declare('s','mainvar') or something that allows a main variable to be
> > specified. Is that an option?
>
> Currently no, but it's easy to implement, as long as you can write a
> sympy code that orders the list of arguments of the Add instance
> above, which it is easy -- you just order it with respect to "s". Then
> just override the _print_Add() method, see sympy/printing/str.py, line
> 57.
>
> Ondrej
>
> >
>
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