OK, thanks for your answers. It's true that LaTeX is complexe to
parse. My question was juste for very simple expressions :
\frac{..}{..} => (...)/(...)
2x+x^2 => 2*x+x**2
...
Vincent
On 12 nov, 00:11, Aaron Meurer <[email protected]> wrote:
> The problem isn't to convert TeX into SymPy, but just LaTeX math,
> which would probably realistically not include any fancy macros or
> anything that might make the grammar to complicated.
>
> The real problems, from what I see, are:
>
> - LaTeX does not have a well-defined grammar.
> - LaTeX allows for a lot of nice shortcuts (this may be more of an
> annoyance than a problem)
> - The same thing might be entered in different ways by different
> people. As a simple example, someone might use \cos, \operator{cos},
> or \mathrm{cos} (the second two might be produced from a LaTeX
> printer).
> - LaTeX lets you print things that are mathematically nonsensical
> (like e.g., \frac{\lim{\sum \to \int}}{+}).
>
> Because of these (especially the last item), I think that any function
> that does this would end up being more of a heuristic than a complete
> algorithm to convert LaTeX to a mathematical expression tree. That
> doesn't mean that it wouldn't be worthwhile to implement, however.
>
> Aaron Meurer
>
>
>
>
>
>
>
> On Fri, Nov 11, 2011 at 1:19 PM, Joachim Durchholz <[email protected]> wrote:
> > Am 11.11.2011 18:52, schrieb Vincent MAILLE:
>
> >> I found the latax command to convert a Sympy object to LaTeX
> >> format,
> >> but, I’m looking for convert a LaTeX expression to Sympy format, is it
> >> possible?
>
> > TeX is Turing-complete, so this is not possible in general.
>
> > Worse, even if you try a heuristic approach (like what Roman proposed),
> > you'd never be sure that the result is correct. So you'd need to to a manual
> > check after conversion, nullifying most (maybe all) of the advantages of an
> > automatic conversion.
>
> > To judge whether these problems are showstoppers or just mild annoyances,
> > you'd probably need somebody with high wizardry skills in
> > mathtex/plastex/whatever.
> > I guess that's why nobody has volunteered for such a project yet. (I
> > wouldn't. I once did some TeX stuff and concluded that TeX's macro syntax
> > and semantics are so horrid I never want to do anything with it.)
>
> > Regards,
> > Jo
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