On Sat, 18 Jul 2009 06:29:22 -0700 (PDT)
Golam Mortuza Hossain <gmhoss...@gmail.com> wrote:
>
> Hi,
>
> On Jun 25, 9:05 am, Burcin Erocal <bur...@erocal.org> wrote:
> > On Thu, 25 Jun 2009 13:22:46 +0200
> >
> > Stan Schymanski <schym...@gmail.com> wrote:
> >
> > > I have been asked to forward the below to the sage-devel list.
> > > Ticket #6290 introduced a way to custom-define thelatexstyle of
> > > functions, but it would be great if something similar was made
> > > possible for any variable. Is there a way for this already? I
> > > used to do it in the following way, but now I get an error
> > > message:
> >
> > > sage: var('hi kunsati delyui')
> > > sage: hi._latex_ = lambda: 'h_i' # Matric suction
> > > head in layer i (=pcapvec)
> > > sage: kunsati._latex_ = lambda: 'K_{unsat,i}' # Unsaturated
> > > hydraulic conductivity in layer i
> > > sage: delyui._latex_ = lambda: '\delta_{yu,i}' # Soil layer
> > > thickness in layer i
> > > Traceback (most recent call last):
> > > ...
> > > AttributeError: 'sage.symbolic.expression.Expression' object
> > > attribute '_latex_' is read-only
> >
> > Since Expression is a cython class, you cannot overwrite the
> > _latex_() method.
> >
> > Pynac supports settinglatexnames forvariablesat creation, but this
> > functionality is not exposed in the wrapper. Another solution by
> > hacking latex_variable_name() might be possible, but I would like to
> > avoid that if possible.
>
>
> I was looking into Pynac/Ginac code to see how difficult it would be
> to expose the Ginac's Tex_name feature for variables.
>
> (1) Pynac allows to specify Tex_name while defining variables.
>
> (2) Currently, pynac is patched to effectively use
> latex_variable_name
> for printing latex as it is better than Ginac's default print_latex
> for variables
>
>
> I suggest following changes:
>
> (1) Compute latex string for variable using Sage's
> "latex_variable_name"
> while defining it unless user provides a latex string.
>
> (2) Store this latex string in Ginac symbol framework and use Ginac's
> print_latex method.
Sounds good to me. Please make the changes, an send me a patch for
pynac.
Calling latex_variable_name() can be done in the code for var() in
Sage. Then, you would only need to change the get_symbol() function in
symbol.cpp line 399-409 to pass the right parameter to the symbol()
constructor.
The patch submission process for pynac is not well defined yet. There
were plans to set up a trac server, but I never got around to it. I'll
try to do that after the conferences here (in about 2 weeks). In the
mean time, as Minh mentioned in another thread, you can send patches to
http://groups.google.com/group/pynac-devel
Thanks.
Burcin
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