use_latex=False in online documentation?

[Ricardo Mayer]

Dear all, 

   is it just me or it seems that init_printing() does NOT invoke use_latex=True by default? It apparently causes not-so-pretty ascii output to appear in the documentation, as in  

 http://docs.sympy.org/0.7.3/tutorial/intro.html

Maybe that page should be change to replace calls of init_printing()  with init_printing(use_latex=True) ? (or maybe change the current default behaviour of init_printing)

thanks,

R

[Aaron Meurer]

The default is to use latex, but only in environments that support it, namely the IPython notebook or the ipython qtconsole of you have latex or matplotlib installed. See the printing section of the tutorial. 

If it's not enabling latex for you in those environments, that's a bug. 

Aaron Meurer

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[Ricardo Mayer]

Thank you, Aaron.

I did tried it ipython (notebook and qt console) and calling init_printing() there does not enable latex (formulas were rendered in ascii characters). I had to pass the argument 'use_latex=True' explicitly.

[Aaron Meurer]

That's a bug then. Are you sure you are using SymPy 0.7.3? There were some issues with this in the previous version. 

Aaron Meurer

[Ricardo Mayer]

Yes, I'm sure  ... or at least 'conda search sympy'  says so :-) 

Oh, BTW, I'm using Ipython 1.0.0   (and sympy 0.7.3)  

I tried ipython 0.13.2 with sympy 0.7..2  and the problem does *not* occur

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[Aaron Meurer]

This is a bug then. I can't reproduce it. It's possible that your
installation is broken. You can try conda install -f sympy and conda
install -f ipython.

This is the code that automatically enables latex in the notebook
https://github.com/sympy/sympy/blob/master/sympy/interactive/printing.py#L278.
It seems like it should work.

What operating system are you on? How are you starting the IPython notebook?

Also, what happens if you set use_latex to 'png', 'matplotlib', or 'mathjax'.

We should enable debugging here.

Aaron Meurer

[Ricardo Mayer]

Thanks!

I'm in Windows 7 64bit and I'm starting the qtconsole and the notebook from Anaconda's Launcher program.

I did a conda install -f sympy and conda install -f ipython.

Mmmm after it, I still have the same problem with the ipython qtconsole (even after setting use_latex to 'png', 'matplotlib', or 'mathjax' or True)  (could it be a problem with 'untested Qt 6.2'?)

But .... it's *different* in the notebook: init_printing() now gives correct latex rendering and if I set  use_latex to 'png', 'matplotlib', or 'mathjax' then I'm back to the ugly display (sorry, ascii).

R

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[Aaron Meurer]

What version of Python are you using? I just found a bug that prevents
the png formatter from working in Python 3 (which is fixed at
https://github.com/sympy/sympy/pull/2398).

I just pushed a branch that adds some debug calls, if you want to try
it out. To use it, you have to set the SYMPY_DEBUG environment
variable to "1" (you can do this from within Python by calling

import os
os.environ['SYMPY_DEBUG'] = '1'

before importing sympy (doing it before you import sympy is important,
because sympy checks this at import time).

Let me know if you want help in getting the code from the pull
request. I would just build a conda package for you, but I don't have
access to a Windows machine to build it on.

Aaron Meurer

[Ricardo Mayer]

It's Python 2.7.5 |Anaconda 1.6.2 (64-bit)| (default, Jul  1 2013, 12:37:52) [MSC v.1500 64 bit (AMD64)]

Thanks for your help, I'll see tomorrow if can pull such branch and build it

best,

R

PS: for now, I can still work in the notebook and set use_latex to True, though.