Thank you! This works!
/Johan


On Tue, Sep 10, 2013 at 1:08 AM, Rasmus <rasmus@gmx.us> wrote:

> Johan Ekh <ekh.johan@gmail.com> writes:
>
> > Hi all,
> > I would like to create a plot with matplotlib and have it exported to a
> > beamer presentation without storing the plot in a file. Is that possible?
>
> I guess you'd want to plot is as a pgf file, whether real of
> 'virtual'.  You could send the result to STDOUT but it may take a bit
> more effort.  Also, a simple test with sys.stdout says the pgf backend
> doesn't support stdout. . .
>
> If *printing* to a pgf file everything works out of the box in recent
> versions of Org.
>
> > Can someone point me to an example or a good starting point?
>
>   http://matplotlib.org/users/pgf.html
>
> Here's an example of a simple plot.
>
> #+TITLE: =matplotlib= and =pgf=
> #+LATEX_HEADER: \usepackage{pgf}
> #+NAME:spectrum
> #+BEGIN_SRC python :var OUT="test.pgf" :exports results :results value file
>   import matplotlib as mpl
>   pgf_with_pdflatex = {
>       "pgf.texsystem": "pdflatex",
>       "text.usetex": True,
>       'pgf.rcfonts': False,
>       'font.size': 9,
>       'fond.family': 'serif',
>       "pgf.preamble": [
>           r"\usepackage[utf8]{inputenc}",
>           r"\usepackage[T1]{fontenc}"]}
>   mpl.rcParams.update(pgf_with_pdflatex)
>   import matplotlib.pyplot as plt
>   from numpy import pi, cos, linspace
>   s1, t1, t2 = 1, .8, .2
>   s = lambda w: s1 / (2 * pi) * (1 + t1 ** 1 + t2 ** 2 + (1 + t2) * 2 * t1
> * cos(w) + 2 * t2 * cos(4 * w))
>   x = linspace(0, pi, 1000)
>   plt.figure(figsize=(4,1.5))
>   plt.plot(x, s(x))
>   plt.xlim( 0, pi)
>   plt.xlabel("$\\omega$")
>   plt.ylabel("Spectrum")
>   plt.tight_layout(0)
>   plt.savefig(OUT, format = 'pgf')
>   return(OUT)
> #+END_SRC
>
> #+RESULTS: spectrum
> [[file:test.pgf]]
>
>
>
>
> --
> . . . The proofs are technical in nature and provides no real
> understanding.
>
>
>
>
>
>