[SciPy-User] [Matplotlib-users] use matplotlib to produce mathathematical expression only

[Johannes Radinger]

-------- Original-Nachricht --------
> Datum: Tue, 17 May 2011 08:16:58 +0000 (UTC)
> Von: Dave Hirschfeld <dave.hirschfeld at gmail.com>
> An: scipy-user at scipy.org
> Betreff: Re: [SciPy-User] [Matplotlib-users] use matplotlib to produce	mathathematical expression only

> > On Mon, May 16, 2011 at 08:21, Johannes Radinger <JRadinger <at> gmx.at>
> wrote:
> > Hello,
> >
> > I want to produce a eps file of following mathematical expression:
> >
> r'$F(x)=p*\frac{1}{s1\sqrt{2\pi}}*e^{-\frac{1}{2}*(\frac{x-m}{s1})}+(1-p)
> *\frac{1}{s1\sqrt{2\pi}}*e^{-\frac{1}{2}*(\frac{x-m}{s1})}$'
> >
> > is it possible to somehow missuse matplotlib for that to produce only
> > the function without any other plot things? Or is there a better python
> > library within scipy? I don't want to install the complete latex
> libraries 
> > just for producing this single eps file.
> > 
> > /johannes
> > 
> 
> Before IPython's new display system
> (http://thread.gmane.org/gmane.comp.python.ipython.devel/5899) I used to
> use 
> the following function to quickly visualise latex formulae:
> 
> def eqview(latex_expr,fontsize=28,dpi=80):
>     from matplotlib.figure import Figure
>     from matplotlib.backends.backend_agg import RendererAgg
>     from pylab import figtext, gcf, close, show, figure
>     latex_expr = '$'+latex_expr+'$'
>     fig = Figure()
>     h = fig.text(0.5, 0.5, latex_expr, 
>                  fontsize = fontsize, 
>                  horizontalalignment = 'center',
>                  verticalalignment= 'center')
>     bbox = h.get_window_extent(RendererAgg(15,15,dpi))
>     del fig
>     figure(figsize=(1.1*bbox.width/dpi,1.25*bbox.height/dpi), dpi=dpi)
>     h = figtext(0.5, 0.5, latex_expr,
>                 fontsize = fontsize, 
>                 horizontalalignment = 'center',
>                 verticalalignment = 'center')
>     fig = gcf()
>     fig.set_facecolor('w')
>     show()
> 
> The call to show could easily be replaced by a call to fig.savefig.
> 
> NB: I'm not a matplotlib guru so this may not be the most efficient
> implementaion, seemed to do the job though.
> 
> HTH,
> Dave


Thank you Dave that works perfectly!!
Just need to use double \\ in the latex_expr


/johannes


> 
> 
> 
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