Hi All:
Thanks to Michael & Ryan, I got my imshow call displaying the correct
data range on the x axis!
However, when I now use a toolbar to zoom the image, I'm getting a
divide by zero error (see traceback below)
I'm using Python 2.5.2, wx 2.8.7.1, and Matplotlib 0.98.5.2 on win32.
Thanks for your (hopefully) continued patience with these newbie
questions!
amb
Here is the call to imshow that I modified:
self.myImage =
self.axes.imshow(self.image_data,aspect='auto',extent=[self.pageOffset,s
elf.pageOffset+self.pageSizeSamps,self.numChans,1])
from:
self.myImage = self.axes.imshow(self.image_data,aspect='auto')
The old version zooms just fine with no error. This code is called in a
menu event handler
Here is how I created the figure & toolbar:
########################################################################
#########################
def SetupPlot(self):
self.figure = Figure()
self.axes = self.figure.add_subplot(111)
self.canvas = FigureCanvas(self, -1, self.figure)
self.data = np.zeros((self.numChans,self.pageSizeSamps))
self.myImage = self.axes.imshow(self.data,aspect='auto')
self.sizer.Add(self.canvas,pos=(1,1))
self.add_toolbar()
########################################################################
#########################
def add_toolbar(self):
self.toolbar = NavigationToolbar2Wx(self.canvas)
self.toolbar.Realize()
# On Windows platform, default window size is incorrect, so set
# toolbar width to figure width.
tw, th = self.toolbar.GetSizeTuple()
fw, fh = self.canvas.GetSizeTuple()
# By adding toolbar in sizer, we are able to put it at the
bottom
# of the frame - so appearance is closer to GTK version.
# As noted above, doesn't work for Mac.
self.toolbar.SetSize((fw, th))
self.sizer.Add(self.toolbar,pos=(2,1))
# update the axes menu on the toolbar
self.toolbar.update()
Here is the error Traceback:
Traceback (most recent call last):
File
"C:\Python25\Lib\site-packages\matplotlib\backends\backend_wx.py", line
1
225, in _onLeftButtonUp
FigureCanvasBase.button_release_event(self, x, y, 1, guiEvent=evt)
File "C:\Python25\Lib\site-packages\matplotlib\backend_bases.py", line
1198, i
n button_release_event
self.callbacks.process(s, event)
File "C:\Python25\Lib\site-packages\matplotlib\cbook.py", line 155, in
process
func(*args, **kwargs)
File "C:\Python25\Lib\site-packages\matplotlib\backend_bases.py", line
2048, i
n release_zoom
self.draw()
File "C:\Python25\Lib\site-packages\matplotlib\backend_bases.py", line
2070, i
n draw
self.canvas.draw()
File
"C:\Python25\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
lin
e 60, in draw
FigureCanvasAgg.draw(self)
File
"C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py", line
279, in draw
self.figure.draw(self.renderer)
File "C:\Python25\Lib\site-packages\matplotlib\figure.py", line 772,
in draw
for a in self.axes: a.draw(renderer)
File "C:\Python25\Lib\site-packages\matplotlib\axes.py", line 1545, in
draw
im.draw(renderer)
File "C:\Python25\Lib\site-packages\matplotlib\image.py", line 233, in
draw
im = self.make_image(renderer.get_image_magnification())
File "C:\Python25\Lib\site-packages\matplotlib\image.py", line 220, in
make_im
age
rx = widthDisplay / numcols
ZeroDivisionError: float division
________________________________
From: matplotlib-users-boun...@lists.sourceforge.net
[mailto:matplotlib-users-boun...@lists.sourceforge.net] On Behalf Of
Lewis, Ambrose J.
Sent: Saturday, February 14, 2009 7:07 AM
To: matplotlib-users@lists.sourceforge.net
Subject: [Matplotlib-users] x axis & imshow...
Thanks Michael & Ryan!
Worked great!
amb
-----Original Message-----
From: Michael Droettboom [mailto:md...@stsci.edu]
Sent: Fri 2/13/2009 1:14 PM
To: Lewis, Ambrose J.
Cc: matplotlib-users@lists.sourceforge.net
Subject: Re: [Matplotlib-users] x axis & imshow...
You can pass "extent=(left, right, bottom, top)" to imshow to specify
what the pixels in the array correspond to in data space.
Mike
Lewis, Ambrose J. wrote:
>
> Hi All:
>
> I'm working on a wxPython GUI that uses matplotlib.
>
> This program reads "chunks" of a data file into a numpy array and than
> plots it using imshow.
>
> The first chunk works great. But, when I load chunks 2 to N, how can I
> specify the different values for the labels on the x axis?
>
> I tried using "axes.set_xlim". This did reposition the x axis as
> hoped, but the data is always being drawn back at the "zero" offset.
>
> Is there a way to tell the axis to map the array to a different x
range?
>
> I can't read the whole file at once, it's just too big
>
> THANXS
>
> amb
>
>
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>
>
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--
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Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
------------------------------------------------------------------------------
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-OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise
-Strategies to boost innovation and cut costs with open source participation
-Receive a $600 discount off the registration fee with the source code: SFAD
http://p.sf.net/sfu/XcvMzF8H
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