Re: [Matplotlib-users] TypeError on CocoaAgg backend

[Barry W. <bar...@gm...>]

Chris,

This error is due to more stringent error checking in pyobjc2 which
ships with Leopard. I was just preparing a patch to send to the
matplotlib dev guys, but if you replace all instances of self.image
with self._image in backend_cocoaagg.py, things should work. Because
PlotView is an NSImage subclass, it inherits a method named image.
pyobjc previously let you overwrite that method with a python instance
variable, but no longer, hence having to rename the instance variable.

barry

On Dec 3, 2007 3:38 PM, Chris Fonnesbeck <lis...@ma...> wrote:
> OK, I'm having a bad backend day (insert joke here).
>
> Since I am on OSX, I decided to switch over to the CocoaAgg backend,
> but it fails when trying to show a histogram, yielding the following
> TypeError:
>
> In [4]: from matplotlib import use
>
> In [5]: use('CocoaAgg')
>
> In [6]: from pylab import hist, show
>
> In [7]: from numpy import random
>
> In [8]: x = random.exponential(2, 1000)
>
> In [9]: hist(x)
> Out[9]:
> (array([545, 230, 117,  59,  18,  15,  11,   1,   3,   1]),
>  array([  2.99606603e-03,   1.52977050e+00,   3.05654494e+00,
>          4.58331937e+00,   6.11009381e+00,   7.63686824e+00,
>          9.16364268e+00,   1.06904171e+01,   1.22171915e+01,
>          1.37439660e+01]),
>  <a list of 10 Patch objects>)
>
> In [10]: show()
> ---------------------------------------------------------------------------
> TypeError                                 Traceback (most recent call last)
>
> /Users/chris/Projects/Occupancy-abundance Manuscript/<ipython console>
> in <module>()
>
> /Library/Python/2.5/site-packages/matplotlib/backends/backend_cocoaagg.py
> in show()
>      44 def show():
>      45     for manager in Gcf.get_all_fig_managers():
> ---> 46         manager.show()
>      47
>      48 def draw_if_interactive():
>
> /Library/Python/2.5/site-packages/matplotlib/backends/backend_cocoaagg.py
> in show(self)
>     203                 mplBundle,
>     204                 False)
> --> 205         NSApplication.sharedApplication().run()
>     206
>     207
>
> /Library/Python/2.5/site-packages/matplotlib/backends/backend_cocoaagg.py
> in startWithBundle_(self, bundle)
>     179     def startWithBundle_(self, bundle):
>     180         #NSApplicationLoad()
> --> 181         if not
> bundle.loadNibFile_externalNameTable_withZone_('Matplotlib.nib', {},
> None):
>     182             print >>sys.stderr, 'Unable to load Matplotlib Cocoa UI!'
>     183             sys.exit()
>
> /Library/Python/2.5/site-packages/matplotlib/backends/backend_cocoaagg.py
> in awakeFromNib(self)
>      79
>      80         self.plotView.setImageFrameStyle_(NSImageFrameGroove)
> ---> 81         self.plotView.image = NSImage.alloc().initWithSize_((0,0))
>      82         self.plotView.setImage_(self.plotView.image)
>      83
>
> TypeError: cannot change a method
>
> --
> Christopher J. Fonnesbeck
> + Fish & Wildlife Research Institute (FWC)
> + 727.235.5570
>
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