BLD: Math not rendered in Travis-built docs

[evectant]

Travis-built docs do not appear to have math rendered correctly. See https://pandas-docs.github.io/pandas-docs-travis/computation.html#exponentially-weighted-windows for one example.

[evectant]

Apparently due to: WARNING: LaTeX command 'latex' cannot be run (needed for math display), check the pngmath_latex setting.

[jorisvandenbossche]

Yes, that is what I thought would be the reason, but it is strange that this warning is raised, as I explicitly added install of latex just for this.

But anyway, we maybe better switch to mathjax

[jorisvandenbossche]

Thanks for the report BTW!

[jreback]

not sure this is the problem. tex does appear to be unpacked. All that said my knowledge of how the latex is actually rendered is really small.

[jreback]

@jorisvandenbossche since you merged this I'll stand corrected!

[jorisvandenbossche]

Well, we'll see if it now shows correctly in the docs. But in any case, the warning disappeared from the travis logs.