Matplotlib plotting style 'classic' hardcoded to Sage

[Kwankyu Lee]

Hi,

This ticket

https://trac.sagemath.org/ticket/25799

aims to remove matplotlib style 'classic' hardcoded into Sage. This makes customization through the matplotlibrc file work, which fails presently.

After the ticket merged, the default matplotlib styles would be applied to all Sage graphics, and Sage graphics may look subtly different than what you have been used to. If you don't like this, then raise your voice to the ticket. 

[François Bissey]

I am sorry to have introduced that in the upgrade to matplotlib 2.1. Hardcoding
was easier than setting the style to classic for every calls for the documentation.
The reports I had was that the default style from 2.1 onwards made the documentation
plots look ugly.

François

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[Kwankyu Lee]

On Monday, July 9, 2018 at 10:40:03 AM UTC+9, François Bissey wrote:

I am sorry to have introduced that in the upgrade to matplotlib 2.1. Hardcoding
was easier than setting the style to classic for every calls for the documentation.
The reports I had was that the default style from 2.1 onwards made the documentation
plots look ugly. 

I looked through the documentation rebuilt with the current default style. It still looks great, and I find nothing ugly :-)

[Kwankyu Lee]

Yeah, I found one thing that looks ugly on my machine:

In the 'classic' style:

In the current default style:

[François Bissey]

Generally equations look better with the font choices in the “classic” style which was
the default before matplotlib-2.

> On 9/07/2018, at 20:34, Kwankyu Lee <ekwa...@gmail.com> wrote:
>
> Yeah, I found one thing that looks ugly on my machine:
>
> In the 'classic' style:
>

> <Auto Generated Inline Image 1.png>

> In the current default style:
>
>
>
>
>
>
>
>

> <Auto Generated Inline Image 2.png>

>
>
>
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> <Auto Generated Inline Image 1.png><Auto Generated Inline Image 2.png>

[Kwankyu Lee]

Consulting 

https://matplotlib.org/users/dflt_style_changes.html

we may keep specifically only the math font of the classic style by:

mpl.rcParams['mathtext.fontset'] = 'cm'

mpl.rcParams['mathtext.rm'] = 'serif'

and adopt the default matplotlib-2 style generally. I assume that the matplotlib-2 style is an improvement over the classic style in general.

[Eric Gourgoulhon]

HI,

Le lundi 9 juillet 2018 12:53:24 UTC+2, Kwankyu Lee a écrit :

Consulting 

https://matplotlib.org/users/dflt_style_changes.html

we may keep specifically only the math font of the classic style by:

mpl.rcParams['mathtext.fontset'] = 'cm'

mpl.rcParams['mathtext.rm'] = 'serif'

and adopt the default matplotlib-2 style generally.

Indeed this would be a good solution. Without it, the math output is really ugly, as shown in this example.

IIRC, this was the main reason to set the default style to 'classic' while upgrading to Matplotlib 2.1.

Let me stress that when using Jupyter notebooks with %display latex, it is nice to have exactly the same fonts in legend labels of plots as in MathJax outputs.

Best wishes,

Eric.