On Sat, Feb 4, 2012 at 9:44 AM, Fabrice Silva <si...@lma.cnrs-mrs.fr> wrote: > Le vendredi 03 février 2012 à 17:39 +0000, David Craig a écrit : > > sure how to get it to plot the outputs from specgram. I use > > specgram as follows, > > Pxx, freqs, bins, im = plt.specgram(......) > > what am I trying imshow?? > > > plt.specgram computes the spectrogram and when calls imshow to display > the resulting array into an image > > Please tell the shape of Pxx, and try the following > > import numpy as np > import matplotlib.pyplot as plt > a = np.empty((12000, 14400), dtype=float) > plt.imshow(a) > plt.show()
Le samedi 04 février 2012 à 10:30 +0000, David Craig a écrit : > Pxx has shape (6001, 1430) and when I tried the lines of code it returned the > following memory error, > > Traceback (most recent call last): > File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_gtk.py", > line 394, in expose_event > self._render_figure(self._pixmap, w, h) > File > "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_gtkagg.py", > line 75, in _render_figure > FigureCanvasAgg.draw(self) > File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_agg.py", > line 394, in draw > self.figure.draw(self.renderer) > File "/usr/lib/python2.7/site-packages/matplotlib/artist.py", line 55, in > draw_wrapper > draw(artist, renderer, *args, **kwargs) > File "/usr/lib/python2.7/site-packages/matplotlib/figure.py", line 798, in > draw > func(*args) > File "/usr/lib/python2.7/site-packages/matplotlib/artist.py", line 55, in > draw_wrapper > draw(artist, renderer, *args, **kwargs) > File "/usr/lib/python2.7/site-packages/matplotlib/axes.py", line 1946, in > draw > a.draw(renderer) > File "/usr/lib/python2.7/site-packages/matplotlib/artist.py", line 55, in > draw_wrapper > draw(artist, renderer, *args, **kwargs) > File "/usr/lib/python2.7/site-packages/matplotlib/image.py", line 354, in > draw > im = self.make_image(renderer.get_image_magnification()) > File "/usr/lib/python2.7/site-packages/matplotlib/image.py", line 569, in > make_image > transformed_viewLim) > File "/usr/lib/python2.7/site-packages/matplotlib/image.py", line 201, in > _get_unsampled_image > x = self.to_rgba(self._A, self._alpha) > File "/usr/lib/python2.7/site-packages/matplotlib/cm.py", line 193, in > to_rgba > x = self.norm(x) > File "/usr/lib/python2.7/site-packages/matplotlib/colors.py", line 802, in > __call__ > val = ma.asarray(value).astype(np.float) > File "/usr/lib/python2.7/site-packages/numpy/ma/core.py", line 2908, in > astype > output = self._data.astype(newtype).view(type(self)) > MemoryError Please, answer on the mailing list, It confirms that the troubles lie in the rendering of images. Could you tell the versions of numpy and matplotlib you are using, and the characteristics of the computer you are working on ? ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
