[IPython-dev] graph displayed twice while overloading _repr_svg_ for notebook

[Thomas Kluyver]

If you've done '%matplotlib inline' previously, when you create a figure
inside a cell, it will automatically be displayed at the end of that cell,
separately from the regular repr system. So your _repr_svg_ method is
getting called once, and the figure you create in that is being displayed
again. I'm not sure what the best way to deal with that is.

Thomas

On 4 January 2015 at 17:31, Julien Schueller <schueller at phimeca.com> wrote:

>
>
>
> Hello,
>
> I'm having trouble overloading _repr_svg_ for graph inlining in the
> notebook; my object is displayed twice if I call plt.plot just before.
> I assumed a figure was left open or something, but even if I call
> plt.close('all') between the matplotlib calls, the result remains the same.
>
> I did some imports first:
> import numpy as np
> import matplotlib.pyplot as plt
> import matplotlib
> from scipy.stats import norm
> import sys
> import io
> print('matplotlib version %s' % matplotlib.__version__)
> import IPython
> print('IPython version %s' % IPython.__version__)
>
>
> Here'my object:
> class NormGraph(object):
>     def __init__(self):
>         super(NormGraph, self).__init__()
>     def _repr_svg_(self):
>         if sys.version_info[0] >= 3:
>             output = io.StringIO()
>         else:
>             output = io.BytesIO()
>         self._fig = plt.figure()
>         axes_kwargs = {}
>         plot_kwargs = {}
>         self._ax = [self._fig.add_subplot(111, **axes_kwargs)]
>         x = np.arange(-10, 10, 0.001)
>         y = norm.pdf(x,0,2)
>         self._ax[0].plot(x, y, **plot_kwargs)
>         self._fig.savefig(output, format='svg')
>
>         return output.getvalue()
>
>
> Then a basic call to pyplot:
> %matplotlib inline
> plt.plot(0, 1)
>
> Then if I try to inline my object it's displayed twice:
> NormGraph()
>
> I atached the complete notebook.
>
> --
> Julien Schueller
> Phimeca Engineering
> www.phimeca.com
>
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>
>
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