matplotlib-users

[Matplotlib-users] using subscripts and tex in labels

[per f. <per...@gm...>]

hi all,

two quick questions about labels. first, is there a way to make
subscripts/superscripts *without* using TeX in labels? For example, I
use helvetica in all my labels and I want to plot something like:
plt.xlabel("log10") where "10" is a subscript of "log", but without
doing: plt.xlabel(r"$\log_{10}$"), since that will use LaTeX fonts
instead of my helvetica font.

second question, when using TeX, I tried the following TeX command in labels:
plt.annotate(r"\frac{\sigma}{\sqrt{\mu}}", ....) but it complains that
"not all arguments converted during string formatting" -- but it seems
like correct TeX to me. if I try r"\frac{1}{2}" then it works, but
using \sigma and \sqrt inside breaks it.. any idea how to fix this?

thanks.

Re: [Matplotlib-users] using subscripts and tex in labels

[Gökhan S. <gok...@gm...>]

On Sun, Jan 31, 2010 at 4:21 PM, per freem <per...@gm...> wrote:

> hi all,
>
> two quick questions about labels. first, is there a way to make
> subscripts/superscripts *without* using TeX in labels? For example, I
> use helvetica in all my labels and I want to plot something like:
> plt.xlabel("log10") where "10" is a subscript of "log", but without
> doing: plt.xlabel(r"$\log_{10}$"), since that will use LaTeX fonts
> instead of my helvetica font.
>

Unicode strings might be the answer for this. Though needs someone's
confirmation.


>
> second question, when using TeX, I tried the following TeX command in
> labels:
> plt.annotate(r"\frac{\sigma}{\sqrt{\mu}}", ....) but it complains that
> "not all arguments converted during string formatting" -- but it seems
> like correct TeX to me. if I try r"\frac{1}{2}" then it works, but
> using \sigma and \sqrt inside breaks it.. any idea how to fix this?
>

Have you forgotten "$" ? The following works correctly in my system.

plt.xlabel(r"$\frac{\sigma}{\sqrt{\mu}}$")


>
> thanks.
>
>
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-- 
Gökhan

Re: [Matplotlib-users] using subscripts and tex in labels

[Eric F. <ef...@ha...>]

per freem wrote:
> hi all,
> 
> two quick questions about labels. first, is there a way to make
> subscripts/superscripts *without* using TeX in labels? For example, I
> use helvetica in all my labels and I want to plot something like:
> plt.xlabel("log10") where "10" is a subscript of "log", but without
> doing: plt.xlabel(r"$\log_{10}$"), since that will use LaTeX fonts
> instead of my helvetica font.

See the mathtext options in matplotlibrc.template.  It looks like what 
you need is

matplotlib.rc('mathtext', fontset='stixsans')

maybe with the additional kwarg, default='regular', if you don't want 
italics.

All this is with text.usetex=False (the default).


> 
> second question, when using TeX, I tried the following TeX command in labels:
> plt.annotate(r"\frac{\sigma}{\sqrt{\mu}}", ....) but it complains that
> "not all arguments converted during string formatting" -- but it seems
> like correct TeX to me. if I try r"\frac{1}{2}" then it works, but
> using \sigma and \sqrt inside breaks it.. any idea how to fix this?

This is working for me with usetex=False or True but including dollar 
signs to signal the use of mathtext (or TeX) parsing.

Eric