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no more inline matplotlib plots in sage notebook


I can't get any matplotplib/pylab plots inline in a notebook. Plots now are created as pdf files that open in another window.

For example, the code below used to create the plot in a new box after the instruction plt.savefig('.')

import numpy as np
import pylab as plt
x = np.arange(-2 * np.pi, 2 * np.pi,0.1) 
plt.plot(x, np.sin(x), label='sin(x)')  

now it returns a link '.pdf' to a pdf file.



returns the following traceback:

Traceback (most recent call last):    
  File "", line 1, in <module>

  File "/private/var/folders/k7/k7XHz3-82RazCk+kNOj55U+++TM/-Tmp-/tmpjD4zHK/", line 14, in <module>
    exec compile(u"plt.savefig('a.png')" + '\n', '', 'single')
  File "", line 1, in <module>

  File "/tmp/sage-mac-app/local/lib/python2.6/site-packages/matplotlib/", line 363, in savefig
    return fig.savefig(*args, **kwargs)
  File "/tmp/sage-mac-app/local/lib/python2.6/site-packages/matplotlib/", line 1084, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File "/tmp/sage-mac-app/local/lib/python2.6/site-packages/matplotlib/", line 1853, in print_figure
    print_method = self._get_print_method(format)
  File "/tmp/sage-mac-app/local/lib/python2.6/site-packages/matplotlib/", line 1793, in _get_print_method
    '%s.' % (format, ', '.join(formats)))
ValueError: Format "png" is not supported.
Supported formats: pdf.

I don't know what settings changes I may have done, and couldn't find any documented help format settings in sage for matplotlib plots. Interestingly I used to experience before the impossibility to export sage generated plots in pdf... It would be nice to have a better control on these settings.

Thank you for any help