[IPython-dev] Supporting the qtconsole and notebook display system simultaneously

[Carlos Córdoba]

El 06/01/16 a las 00:13, Jason Moore escribió:
> SymPy has a comprehensive printing system and we leverage IPython's 
> qtconsole and notebook display abilities to show mathematics in 
> unicode, mathjax, and png outputs. Typically all three of these are 
> generated and the IPython frontend can choose what to display.
>
> We've hit a bug that we can't figure out how to fix though. Matplotlib 
> has a minimal LaTeX implementation and can output PNGs. If a user 
> doesn't have a full LaTeX suit installed we fall back to that. But 
> since matplotlib doesn't handle LaTeX environments, it can't render 
> things like matrices.
>
> Now if a qtconsole user tries to display a matrix, this fails if 
> matplotlib is the only available renderer. But if the user is using 
> the notebook then the matplotlib renderer will fail but mathjax will 
> print properly. We'd like to fall back to unicode printing if 
> matplotlib fails to print **only in the qtconsole**, but render with 
> mathjax in the notebook.

There's already a pull request in qtconsole about this problem:

https://github.com/jupyter/qtconsole/pull/65


Cheers,
Carlos

>
> So, as far as we can tell, we need to know which frontend is trying to 
> display our object so that we can handle errors properly. We haven't 
> been able to think of a workaround that is agnostic of the frontend.
>
> There is some discussion in this PR: 
> https://github.com/sympy/sympy/pull/9976 (among others).
>
> Any suggestions?
>
> Jason
> moorepants.info <http://moorepants.info>
> +01 530-601-9791
>
>
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