matplotlib-users Mailing List for matplotlib

There is no automatic way (that are implemented in matplotlib) to
adjust the location of the colorbar axes to match that of the parent
axes. Thus you need to manually do this.
The axes_grid toolkit (which is included in 0.99) provide some helper
function for it though. Check out the function
"demo_locatable_axes_easy" in the example below.
http://matplotlib.sourceforge.net/examples/axes_grid/demo_axes_divider.html
The best way to change the colorbar tick is to provide *ticks*
parameter when you create the colorbar. Changing ticks of the existing
colorbar is a bit tricky.
Regards,
-JJ
On Tue, Dec 15, 2009 at 2:11 PM, william ratcliff
<wil...@gm...> wrote:
> I have two quick questions about colorbars in matplotlib. The first is
> related to the size of the colorbar. I would like to have square axes for a
> plot, so I use:
> ax=fig.add_subplot(1,2,1)
> pc=ax.pcolor(X,Z,P2)
> ax.set_aspect(1./ax.get_data_ratio())
> cb=pylab.colorbar(pc,orientation='vertical')
> However, here I find that the colorbar is as long as the original image
> rather than the scaled image. Is there a good way around this?
> pylab.axis('equal')
> and
> pylab.axis('scaled')
> have not helped.
> The second question is related to the choice of tickmarks for the colorbar.
> If I would like to have only say 4 ticks on colorbar, I tried:
> cb.ax.xaxis.set_major_locator(MaxNLocator(4)), however, the range for the
> colorbar is now incorrect. Suggestions? I am using
> version 0.99.0
> Thanks,
> William
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Bruce Ford wrote:
> Using the code below, I'm placing a second title on a figure. However
> this title is placed over the figure and does not adjust the figure
> placement for the title. Is there a way to adjust the placement of
> the figure further down? I'm not seeing any such setting.
> 
> pyplot.suptitle(MakeTitle(param, hour, day, year, month,
> model, figure_type,date_time_type,mei_span,composite_year,composite_years,year_array,year1,day1,month1),
> fontsize=10)
> if plot_another == 1:
> pyplot.suptitle(MakeTitle(param1, hour1, day1, year1,
> month1, model1,
> figure_type1,date_time_type1,mei_span1,composite_year1,composite_years1,year_array1,year11,day11,month11),
> fontsize=10, y=.90)
> 
> Any help would be appreciated.
Bruce,
It sounds like subplots_adjust might be what you need at this point:
http://matplotlib.sourceforge.net/api/pyplot_api.html?highlight=subplots_adjust#matplotlib.pyplot.subplots_adjust
Eric
> 
> Bruce
> ---------------------------------------
> Bruce W. Ford
> Clear Science, Inc.
> br...@cl...
> bru...@na...
> http://www.ClearScienceInc.com
> Phone/Fax: 904-379-9704
> 8241 Parkridge Circle N.
> Jacksonville, FL 32211
> Skype: bruce.w.ford
> Google Talk: fo...@gm...
> 
> ------------------------------------------------------------------------------
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Using the code below, I'm placing a second title on a figure. However
this title is placed over the figure and does not adjust the figure
placement for the title. Is there a way to adjust the placement of
the figure further down? I'm not seeing any such setting.
 pyplot.suptitle(MakeTitle(param, hour, day, year, month,
model, figure_type,date_time_type,mei_span,composite_year,composite_years,year_array,year1,day1,month1),
fontsize=10)
 if plot_another == 1:
 pyplot.suptitle(MakeTitle(param1, hour1, day1, year1,
month1, model1,
figure_type1,date_time_type1,mei_span1,composite_year1,composite_years1,year_array1,year11,day11,month11),
fontsize=10, y=.90)
Any help would be appreciated.
Bruce
---------------------------------------
Bruce W. Ford
Clear Science, Inc.
br...@cl...
bru...@na...
http://www.ClearScienceInc.com
Phone/Fax: 904-379-9704
8241 Parkridge Circle N.
Jacksonville, FL 32211
Skype: bruce.w.ford
Google Talk: fo...@gm...

Perry Greenfield wrote:
> To give an idea, when you ask matplotlib to render an image, it 
> processes it (resamples, rescales, maps to colors, etc) in order to 
> actually display it. Since it may redo all that if you resize or 
> otherwise re-render the figure, it needs to keep a reference to the 
> original image. Even if you delete your reference to it, it still has 
> it, and thus it won't be deleted until the figure is cleared. So if the 
> input to the imshow call is the full size array, you will have that 
> around. You may want to downsample that image to lower resolution (and 
> make sure that the downsampled version is a copy, not a view of the 
> original array).
This is what I already did, at least that was what I thought. I
calculated a downsampled image, but ignored it ... :(
So now I was able to do the stitching of >30 images with a resolution of
1224x1632, yielding a total picture of 6600 x 5450 pixels, with 600 dpi.
Thanks for your help!
Cheers, Gerd
-- 
Dr. Gerd Wellenreuther
beamline scientist P06 "Hard X-Ray Micro/Nano-Probe"
Petra III project
HASYLAB at DESY
Notkestr. 85
22603 Hamburg
Tel.: + 49 40 8998 5701

On 16/12/2009, at 7:47 PM, Christopher Fonnesbeck wrote:
> I have built matplotlib from svn on OSX 10.6, using the make.osx script that is included with the source, except with the 32-bit build flags removed. The resulting module fails on import, however, with the following:
> 
> 
I was able to get a build that imports without error, but on several plots I get the very bizarre error:
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8035-py2.6-macosx-10.6-universal.egg/matplotlib/backends/backend_agg.py", line 221, in _get_agg_font
 font = FT2Font(str(fname))
RuntimeError: Could not open facefile /Library/Python/2.6/site-packages/matplotlib-1.0.svn_r7956-py2.6-macosx-10.6-universal.egg/matplotlib/mpl-data/fonts/ttf/Vera.ttf; Cannot_Open_Resource
Notice that the current matplotlib .egg package (r8035) looks for resources in a previous build (r7956)! I have eradicated all previous matplotlib builds and deleted the build folder from within the matplotlib source folder. I have no idea why this is happening.

I have built matplotlib from svn on OSX 10.6, using the make.osx script that is included with the source, except with the 32-bit build flags removed. The resulting module fails on import, however, with the following:
In [1]: from pylab import *
------------------------------------------------------------
Traceback (most recent call last):
 File "<ipython console>", line 1, in <module>
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/pylab.py", line 1, in <module>
 from matplotlib.pylab import *
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/pylab.py", line 206, in <module>
 from matplotlib import mpl # pulls in most modules
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/mpl.py", line 2, in <module>
 from matplotlib import axis
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/axis.py", line 14, in <module>
 import matplotlib.text as mtext
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/text.py", line 30, in <module>
 from matplotlib.backend_bases import RendererBase
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/backend_bases.py", line 40, in <module>
 import matplotlib.textpath as textpath
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/textpath.py", line 9, in <module>
 from matplotlib.mathtext import MathTextParser
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/mathtext.py", line 52, in <module>
 import matplotlib._png as _png
ImportError: dlopen(/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/_png.so, 2): Symbol not found: _png_create_info_struct
 Referenced from: /Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/_png.so
 Expected in: flat namespace
in /Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/_png.so
This seems like this is related to 32-bit code lurking somewhere, but I'm not sure where. I am surely using 64-bit python.
Any ideas or solutions are appreciated.

I have built matplotlib from svn on OSX 10.6, using the make.osx script that is included with the source, except with the 32-bit build flags removed. The resulting module fails on import, however, with the following:
In [1]: from pylab import *
------------------------------------------------------------
Traceback (most recent call last):
 File "<ipython console>", line 1, in <module>
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/pylab.py", line 1, in <module>
 from matplotlib.pylab import *
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/pylab.py", line 206, in <module>
 from matplotlib import mpl # pulls in most modules
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/mpl.py", line 2, in <module>
 from matplotlib import axis
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/axis.py", line 14, in <module>
 import matplotlib.text as mtext
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/text.py", line 30, in <module>
 from matplotlib.backend_bases import RendererBase
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/backend_bases.py", line 40, in <module>
 import matplotlib.textpath as textpath
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/textpath.py", line 9, in <module>
 from matplotlib.mathtext import MathTextParser
 File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/mathtext.py", line 52, in <module>
 import matplotlib._png as _png
ImportError: dlopen(/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/_png.so, 2): Symbol not found: _png_create_info_struct
 Referenced from: /Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/_png.so
 Expected in: flat namespace
 in /Library/Python/2.6/site-packages/matplotlib-1.0.svn_r8034-py2.6-macosx-10.6-universal.egg/matplotlib/_png.so
This seems like this is related to 32-bit code lurking somewhere, but I'm not sure where. I am surely using 64-bit python.
Any ideas or solutions are appreciated.