matplotlib-users Mailing List for matplotlib

Hi,
I am writing some code for automated testing via GPIB using MPL and PyQt. To simulate automated data collection while debugging the program, I have added a for loop (see below) after reading in a data file that plots each point one by one. When I run the program in Linux, I see each point appear on the canvas one by one as designed, but when I run the same code in Windows, nothing shows up on the canvas during the for loop. Instead, once the loop has completed, all points appear simulataneously. Is there any reason the why calls to canvas.draw() show nothing when run in Windows? I'm really lost on this one and would appreciate it someone can tell me what I'm doing wrong. If you need more info on what I'm doing, please let me know.
Thanks in advance,
Steve
self.data = loadtxt('test_data2.csv',comments = '#',delimiter = ',',skiprows = 0)
for i in range(0,len(self.data)):
      line, = self.plotWidget.canvas.ax.plot([self.data[i,1]], [self.data[i,0]], 'bo')
      self.plotWidget.canvas.draw()
 
 

On Tue, Jun 9, 2009 at 3:05 PM, Lou Pecora <lou...@ya...> wrote:
>
> --- On *Tue, 6/9/09, Gökhan SEVER <gok...@gm...>* wrote:
> > Modified that section as to eliminate confusions:
>
> *> NOTE:* *Experimental work has been going on to integrate 3D plotting
> functionality into matplotlib. Please see the related mplot3d
> documentation<http://matplotlib.sourceforge.net/mpl_toolkits/mplot3d/index.html?highlight=mplot3d> or
> take a look at matplotlib gallery<http://matplotlib.sourceforge.net/gallery.html> for
> example 3D plots. For a more sophisticated 3D visualization and plotting
> interface, you can try Mayavi <http://code.enthought.com/projects/mayavi/> which
> is actively maintained and features an 'mlab' interface similar to
> matplotlib's 'pylab'. *
>
>
> ---------------------------------------------------------------------------------------------
>
> It is good news that matplotlib 3D functions are being upgraded. Thank
> you.
> But it is unclear from the message whether one still must stay with 0.91
> version or the 3D functions in pylab now work with 0.98 and higher. Can you
> give us some information on that?
>
> Thanks.
>
> -- Lou Pecora, my views are my own.
>
>
>
I have thought using the word "experimental" will make the state of mplot3d
clear :) Nevertheless, you have already been answered.
GS

On Tue, Jun 9, 2009 at 3:05 PM, Lou Pecora<lou...@ya...> wrote:
> ---------------------------------------------------------------------------------------------
> It is good news that matplotlib 3D functions are being upgraded. Thank you.
> But it is unclear from the message whether one still must stay with 0.91
> version or the 3D functions in pylab now work with 0.98 and higher. Can you
> give us some information on that?
They now work in matplotlib svn in the toolkit mpl_toolkits.mplot3d,
and will be available in the next release
http://matplotlib.sourceforge.net/faq/installing_faq.html#install-from-svn
JDH

On Tue, Jun 9, 2009 at 2:42 PM, Hani Nakhoul<na...@gm...> wrote:
> I'm sorry--here's the right listing:
>
> $ ls matplotlib
> agg24   examples   KNOWN_BUGS       PKG-INFO      setup.py
> build   __init__.py  lib          README.txt     src
> build.out __init__.pyc license        setup.cfg.template TODO
> CHANGELOG INSTALL    Makefile        setupegg.py     ttconv
> CXX    install.out  MANIFEST.in      setupext.py
> doc    INTERACTIVE  matplotlibrc.template setupext.pyc
>
es, this is your problem. You have the matplotlib source directory in
your HOME directory and when you run from your home directory, it is
being picked up instead of the installation directory. I usually name
my src tree "mpl" to avoid this problem
 > cd
 > mv matplotlib mpl
JDH

--- On Tue, 6/9/09, Gökhan SEVER <gok...@gm...> wrote:
> Modified that section as to eliminate confusions:
> NOTE: Experimental work has been going on to integrate 3D plotting functionality into matplotlib. Please see the related mplot3d documentation or take a look at matplotlib gallery for example 3D plots. For a more sophisticated 3D visualization and plotting interface, you can try Mayavi which is actively maintained and features an 'mlab' interface similar to matplotlib's 'pylab'. 
---------------------------------------------------------------------------------------------
It is good news that matplotlib 3D functions are being upgraded. Thank you.
But it is unclear from the message whether one still must stay with 0.91 version or the 3D functions in pylab now work with 0.98 and higher. Can you give us some information on that? 
Thanks.
-- Lou Pecora, my views are my own.
 

I'm sorry--here's the right listing:
$ ls matplotlib
agg24 examples KNOWN_BUGS PKG-INFO setup.py
build __init__.py lib README.txt src
build.out __init__.pyc license setup.cfg.template TODO
CHANGELOG INSTALL Makefile setupegg.py ttconv
CXX install.out MANIFEST.in setupext.py
doc INTERACTIVE matplotlibrc.template setupext.pyc
Hani
On Tue, Jun 9, 2009 at 2:34 PM, John Hunter <jd...@gm...> wrote:
> On Tue, Jun 9, 2009 at 2:13 PM, Hani Nakhoul<na...@gm...> wrote:
> > Dear all,
> > Here is the listing:
> >
> > In [1]: import matplotlib
> >
> > In [2]: print matplotlib.__file__
> > matplotlib/__init__.pyc
> >
> > In [3]: ls -a
> > ./ .gimp-2.6/ Public/
> > ../ .gksu.lock .pulse/
> > .adobe/ .gnome2/ .pulse-cookie
> > ATLAS/ .gnome2_private/ pydstool/
> > .bash_history .gnupg/ PyDSTool/
> > .bash_logout .gstreamer-0.10/ .recently-used
> > .bashrc .gtk-bookmarks .recently-used.xbel
> > .bashrc~ .gvfs/ scipy-0.7.0b1/
> > .cache/ .hplip/ scipy_build/
> > .checkgmail/ .ICEauthority .ssh/
> > .compiz/ .icons/ .subversion/
> > .config/ .inkscape/ .sudo_as_admin_successful
> > .dbus/ .ipython/ SuiteSparse/
> > Desktop/ lapack-3.1.1/ Templates/
> > .dmrc .lftp/ .themes/
> > Documents/ .local/ .thumbnails/
> > .emacs .macromedia/ .tomboy/
> > .emacs.d/ matplotlib/ .tomboy.log
> > .esd_auth .matplotlib/ .tsclient/
> > .evolution/ .mozilla/ .update-manager-core/
> > Examples@ .mozilla-thunderbird/ .update-notifier/
> > fftw-3.2/ Music/ Videos/
> > .fontconfig/ .nautilus/ .viminfo
> > .gconf/ neuron/ .wapi/
> > .gconfd/ numpy-1.2.1/ .Xauthority
> > .geany/ .openoffice.org2/ .xsession-errors
> > .gegl-0.0/ Pictures/
> > .gftp/ .profile
>
>
>
> What I wanted was the listing of the "matplotlib" dir
>
> > ls matplotlib
>
> it looks like you have a matplotlib dir in your working directory that
> is being picked up and you probably don't want it.
>
> JDH
>

On Tue, Jun 9, 2009 at 2:13 PM, Hani Nakhoul<na...@gm...> wrote:
> Dear all,
> Here is the listing:
>
> In [1]: import matplotlib
>
> In [2]: print matplotlib.__file__
> matplotlib/__init__.pyc
>
> In [3]: ls -a
> ./      .gimp-2.6/     Public/
> ../      .gksu.lock     .pulse/
> .adobe/    .gnome2/       .pulse-cookie
> ATLAS/      .gnome2_private/    pydstool/
> .bash_history .gnupg/       PyDSTool/
> .bash_logout  .gstreamer-0.10/    .recently-used
> .bashrc    .gtk-bookmarks     .recently-used.xbel
> .bashrc~    .gvfs/       scipy-0.7.0b1/
> .cache/    .hplip/       scipy_build/
> .checkgmail/  .ICEauthority     .ssh/
> .compiz/    .icons/       .subversion/
> .config/    .inkscape/     .sudo_as_admin_successful
> .dbus/      .ipython/     SuiteSparse/
> Desktop/    lapack-3.1.1/     Templates/
> .dmrc      .lftp/       .themes/
> Documents/   .local/       .thumbnails/
> .emacs      .macromedia/     .tomboy/
> .emacs.d/   matplotlib/     .tomboy.log
> .esd_auth   .matplotlib/     .tsclient/
> .evolution/  .mozilla/     .update-manager-core/
> Examples@   .mozilla-thunderbird/ .update-notifier/
> fftw-3.2/   Music/       Videos/
> .fontconfig/  .nautilus/     .viminfo
> .gconf/    neuron/       .wapi/
> .gconfd/    numpy-1.2.1/     .Xauthority
> .geany/    .openoffice.org2/   .xsession-errors
> .gegl-0.0/   Pictures/
> .gftp/      .profile
What I wanted was the listing of the "matplotlib" dir
> ls matplotlib
it looks like you have a matplotlib dir in your working directory that
is being picked up and you probably don't want it.
JDH

Dear all,
Here is the listing:
In [1]: import matplotlib
In [2]: print matplotlib.__file__
matplotlib/__init__.pyc
In [3]: ls -a
./ .gimp-2.6/ Public/
../ .gksu.lock .pulse/
.adobe/ .gnome2/ .pulse-cookie
ATLAS/ .gnome2_private/ pydstool/
.bash_history .gnupg/ PyDSTool/
.bash_logout .gstreamer-0.10/ .recently-used
.bashrc .gtk-bookmarks .recently-used.xbel
.bashrc~ .gvfs/ scipy-0.7.0b1/
.cache/ .hplip/ scipy_build/
.checkgmail/ .ICEauthority .ssh/
.compiz/ .icons/ .subversion/
.config/ .inkscape/ .sudo_as_admin_successful
.dbus/ .ipython/ SuiteSparse/
Desktop/ lapack-3.1.1/ Templates/
.dmrc .lftp/ .themes/
Documents/ .local/ .thumbnails/
.emacs .macromedia/ .tomboy/
.emacs.d/ matplotlib/ .tomboy.log
.esd_auth .matplotlib/ .tsclient/
.evolution/ .mozilla/ .update-manager-core/
Examples@ .mozilla-thunderbird/ .update-notifier/
fftw-3.2/ Music/ Videos/
.fontconfig/ .nautilus/ .viminfo
.gconf/ neuron/ .wapi/
.gconfd/ numpy-1.2.1/ .Xauthority
.geany/ .openoffice.org2/ .xsession-errors
.gegl-0.0/ Pictures/
.gftp/ .profile
Hani
On Tue, Jun 9, 2009 at 10:30 AM, John Hunter <jd...@gm...> wrote:
> On Tue, Jun 9, 2009 at 10:22 AM, Hani Nakhoul<na...@gm...> wrote:
> > Dear all,
> > I'm running matplotlib 0.98.5.2 on a machine with Ubuntu Intrepid 8.10.
> It's
> > worked well for me so far, but I encounter problems running matplotlib
> when
> > trying to update the PYTHONPATH in the .bashrc file. Adding just the line
> > "export PYTHONPATH=$PYTHONPATH", for example, gives the following:
> >
> > $ ipython -pylab
> > Traceback (most recent call last):
> > File "/usr/bin/ipython", line 27, in <module>
> > IPython.Shell.start().mainloop()
> > File "/var/lib/python-support/python2.5/IPython/Shell.py", line 1219,
> in
> > start
> > shell = _select_shell(sys.argv)
> > File "/var/lib/python-support/python2.5/IPython/Shell.py", line 1188,
> in
> > _select_shell
> > backend = matplotlib.rcParams['backend']
> > AttributeError: 'module' object has no attribute 'rcParams'
>
> Most likely you are adding a directory to the path that has a
> directory named matplotlib in it (eg the matplotlib src directory)
> which is not the matplotlib install directory. Try doing
>
> >>> import matplotlib
> >>> print matplotlib.__file__
>
> when the PYTHONPATH is set to the troublesome value and then do an ls
> on the directory that is reported by the __file__ printout. Post the
> listing here and we can advise further.
>
> JDH
>

On Tue, 9 Jun 2009 11:31:19 -0700 (PDT)
 Anton Vasilescu <vas...@ya...> wrote:
> I wasn't able to find one in Matplotlib but you can use 
>PIL library for all the imaging work. Really easy to use. 
> Here is the webpage for it: 
>http://www.pythonware.com/products/pil/index.htm
> 
> Anton
> 
> 
Hi Anton,
Thank you for your prompt reply.
I am aware of PIL.
However I didn't find an autocrop function within PIL.
Cheers,
 Nils
from PIL import Image
im = Image.open('test.png')
#
# Calculates the bounding box of the non-zero regions in 
the image.
# The bounding box is returned as a 4-tuple defining
# the left, upper, right, and lower pixel coordinate.
# If the image is completely empty, this method returns 
None.
#
print im.getbbox()
print im.size
#
# Returns a rectangular region from the current image.
# The box is a 4-tuple defining the left, upper, right, 
and lower
#
box = (100, 100, 800, 800)
region = im.crop(box)
region.show()
 
It would be nice to compute the box automatically.
Any idea ?

I wasn't able to find one in Matplotlib but you can use PIL library for all the imaging work. Really easy to use. 
Here is the webpage for it: http://www.pythonware.com/products/pil/index.htm
Anton
________________________________
From: Nils Wagner <nw...@ia...>
To: mat...@li...
Sent: Tuesday, June 9, 2009 10:22:05 AM
Subject: [Matplotlib-users] autocrop function
Hi all,
I am looking for an autocrop function.
It should remove borders from an image.
Is it available in matplotlib ?
Any pointer would be appreciated.
Thanks in advance
 Nils
 
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On Tue, Jun 9, 2009 at 1:00 PM, Esmail <eb...@ho...> wrote:
> Hi Gökhan,
>
>
> Gökhan SEVER wrote:
> >
> > I'll give mayavi/mlab a try, I think there was a note to the
> > effect that matplotlib quit supporting 3D plots and recommended
> > mayavi.
> >
> >
> > There is still work going on to improve matplotlib 3d plotting
> > functionality. You can see matplotlib gallery or check-out the latest
> > trunk of matplotlib and experiment with the 3d examples.
>
> Ah .. ok .. good to know. I was going by this note:
>
> NOTE: 3D plotting has been removed from matplotlib >= 0.98. You'll either
> need
> to use an older 0.91.x version or look at Mayavi which is actively
> maintained
> and features an 'mlab' interface similar to matplotlib's 'pylab'.
>
> posted here:
>
> http://www.scipy.org/Cookbook/Matplotlib
>
Modified that section as to eliminate confusions:
*NOTE:* *Experimental work has been going on to integrate 3D plotting
functionality into matplotlib*. Please see the related mplot3d
documentation<http://matplotlib.sourceforge.net/mpl_toolkits/mplot3d/index.html?highlight=mplot3d>or
take a look at matplotlib
gallery <http://matplotlib.sourceforge.net/gallery.html> for example 3D
plots. For a more sophisticated 3D visualization and plotting interface, you
can try Mayavi <http://code.enthought.com/projects/mayavi/> which is
actively maintained and features an 'mlab' interface similar to matplotlib's
'pylab'.
>
>
> > So much to learn, so little time :-)
> >
> >
> > Isn't that nice? Lifelong learning? Why are complaining? Are you not a
> > scientist or raising a kid something :)
>
> hehe .. I know it sounded like a complaint, but it's really not. I
> consider myself a lifelong student, and I love learning new things.
> I just have a big appetite :-)
>
No matter how big an appetite you have, you can only digest certain amount
of items at a time :)
Cheers for lifelong learning :)
>
> Cheers,
> Esmail
>
>

Hi Gökhan,
Gökhan SEVER wrote:
> 
> I'll give mayavi/mlab a try, I think there was a note to the
> effect that matplotlib quit supporting 3D plots and recommended
> mayavi.
> 
> 
> There is still work going on to improve matplotlib 3d plotting 
> functionality. You can see matplotlib gallery or check-out the latest 
> trunk of matplotlib and experiment with the 3d examples.
Ah .. ok .. good to know. I was going by this note:
NOTE: 3D plotting has been removed from matplotlib >= 0.98. You'll either need 
to use an older 0.91.x version or look at Mayavi which is actively maintained 
and features an 'mlab' interface similar to matplotlib's 'pylab'.
posted here:
http://www.scipy.org/Cookbook/Matplotlib
> So much to learn, so little time :-)
> 
> 
> Isn't that nice? Lifelong learning? Why are complaining? Are you not a 
> scientist or raising a kid something :)
hehe .. I know it sounded like a complaint, but it's really not. I
consider myself a lifelong student, and I love learning new things.
I just have a big appetite :-)
Cheers,
Esmail

On Tue, Jun 9, 2009 at 12:46 PM, Esmail <eb...@ho...> wrote:
> Sebastian Busch wrote:
> >
> >
> > Hey Esmail,
> >
> > there was the possibility for 3D plots in matplotlib:
> > http://www.scipy.org/Cookbook/Matplotlib/mplot3D
> >
> > however, the mayavi "mlab" interface was designed explicitly to be as
> > simple as pylab.
> >
> http://code.enthought.com/projects/mayavi/docs/development/html/mayavi/mlab.html
> >
> > have fun 3D plotting,
> > sebastian.
>
> I'll give mayavi/mlab a try, I think there was a note to the
> effect that matplotlib quit supporting 3D plots and recommended
> mayavi.
>
There is still work going on to improve matplotlib 3d plotting
functionality. You can see matplotlib gallery or check-out the latest trunk
of matplotlib and experiment with the 3d examples.
>
> So much to learn, so little time :-)
Isn't that nice? Lifelong learning? Why are complaining? Are you not a
scientist or raising a kid something :)
>
>
> Thanks,
> Esmail
>
>

Sebastian Busch wrote:
>
> 
> Hey Esmail,
> 
> there was the possibility for 3D plots in matplotlib:
> http://www.scipy.org/Cookbook/Matplotlib/mplot3D
> 
> however, the mayavi "mlab" interface was designed explicitly to be as
> simple as pylab.
> http://code.enthought.com/projects/mayavi/docs/development/html/mayavi/mlab.html
> 
> have fun 3D plotting,
> sebastian.
I'll give mayavi/mlab a try, I think there was a note to the
effect that matplotlib quit supporting 3D plots and recommended
mayavi.
So much to learn, so little time :-)
Thanks,
Esmail

Hi all,
I am looking for an autocrop function.
It should remove borders from an image.
Is it available in matplotlib ?
Any pointer would be appreciated.
Thanks in advance
 Nils
 

>
>> I am curious though why you prefer to alter the default color cycle
>> rather than just passing the color in to the plot command
[...]
> I got tired of the extra code involved with this method and went 
> looking for a way to change the defaults.
I do something similar to enforce style/substance separation; the 
plotting is the simplest possible line at the end of the data 
analysis, and all the stylistic choices are somewhere else. Makes it 
easy to keep all plot styles consistent during a project, and makes it 
slightly harder to futz with font prettiness when I should be doing 
real work.
Chloe Lewis
Graduate student, Amundson Lab
Division of Ecosystem Sciences, ESPM
University of California, Berkeley
137 Mulford Hall - #3114
Berkeley, CA 94720-3114
ch...@na...

On Tue, Jun 9, 2009 at 10:22 AM, Hani Nakhoul<na...@gm...> wrote:
> Dear all,
> I'm running matplotlib 0.98.5.2 on a machine with Ubuntu Intrepid 8.10. It's
> worked well for me so far, but I encounter problems running matplotlib when
> trying to update the PYTHONPATH in the .bashrc file. Adding just the line
> "export PYTHONPATH=$PYTHONPATH", for example, gives the following:
>
> $ ipython -pylab
> Traceback (most recent call last):
> File "/usr/bin/ipython", line 27, in <module>
> IPython.Shell.start().mainloop()
> File "/var/lib/python-support/python2.5/IPython/Shell.py", line 1219, in
> start
> shell = _select_shell(sys.argv)
> File "/var/lib/python-support/python2.5/IPython/Shell.py", line 1188, in
> _select_shell
> backend = matplotlib.rcParams['backend']
> AttributeError: 'module' object has no attribute 'rcParams'
Most likely you are adding a directory to the path that has a
directory named matplotlib in it (eg the matplotlib src directory)
which is not the matplotlib install directory. Try doing
>>> import matplotlib
>>> print matplotlib.__file__
when the PYTHONPATH is set to the troublesome value and then do an ls
on the directory that is reported by the __file__ printout. Post the
listing here and we can advise further.
JDH

On Tue, Jun 9, 2009 at 10:18 AM, Jouni K. Seppänen<jk...@ik...> wrote:
> Chaitanya Krishna <ic...@gm...> writes:
>
>> On Tue, Jun 9, 2009 at 12:05 PM, Paul Anton Letnes <pau...@gm...> wrote:
>>>
>>> When I run the script below, the xlabel and ylabel do not show up. If I
>>> increase the figure size, it all works fine.
>>
>> I am not sure if it is a bug. But, it is usual that such a thing
>> happens when you are making small figures (like in your case).
>
> Arguably it is a bug, since it is reasonable to expect that when you set
> an xlabel or ylabel (or, say, large yticklabels), it shows up in the
> figure. There are at least two problems to solve here: what should the
> user interface be like, and how can it best be implemented?
These FAQs are also probably relevant:
http://matplotlib.sourceforge.net/faq/howto_faq.html#move-the-edge-of-an-axes-to-make-room-for-tick-labels
http://matplotlib.sourceforge.net/faq/howto_faq.html#automatically-make-room-for-tick-labels
JDH

Dear all,
I'm running matplotlib 0.98.5.2 on a machine with Ubuntu Intrepid 8.10. It's
worked well for me so far, but I encounter problems running matplotlib when
trying to update the PYTHONPATH in the .bashrc file. Adding just the line
"export PYTHONPATH=$PYTHONPATH", for example, gives the following:
$ ipython -pylab
Traceback (most recent call last):
 File "/usr/bin/ipython", line 27, in <module>
 IPython.Shell.start().mainloop()
 File "/var/lib/python-support/python2.5/IPython/Shell.py", line 1219, in
start
 shell = _select_shell(sys.argv)
 File "/var/lib/python-support/python2.5/IPython/Shell.py", line 1188, in
_select_shell
 backend = matplotlib.rcParams['backend']
AttributeError: 'module' object has no attribute 'rcParams'
On the other hand,
$ ipython
permits ipython to load seemingly normally, but in that case
In [1]: import matplotlib.pyplot as plt
ImportError: No module named pyplot
Any ideas on what might be wrong? I'd be grateful for any advice.
Thanks,
Hani Nakhoul

Chaitanya Krishna <ic...@gm...> writes:
> On Tue, Jun 9, 2009 at 12:05 PM, Paul Anton Letnes <pau...@gm...> wrote:
>>
>> When I run the script below, the xlabel and ylabel do not show up. If I
>> increase the figure size, it all works fine.
>
> I am not sure if it is a bug. But, it is usual that such a thing
> happens when you are making small figures (like in your case).
Arguably it is a bug, since it is reasonable to expect that when you set
an xlabel or ylabel (or, say, large yticklabels), it shows up in the
figure. There are at least two problems to solve here: what should the
user interface be like, and how can it best be implemented?
The user interface question seems difficult to me. If you set the figure
size to something small (as in this case) and then add labels, should
matplotlib reduce the area available for the plot? Or should it reduce
the font size of the labels and the tick labels, and perhaps the amount
of white space between the axes and the labels? Or some combination of
these?
The implementation question could also be somewhat hairy, since the
bounding box of text objects depends on the backend. If agg and pdf
disagree on the size of a label, is it OK to get different-looking
results in png and pdf?
-- 
Jouni K. Seppänen
http://www.iki.fi/jks

On Tue, Jun 9, 2009 at 8:23 AM, Ulrich vor dem Esche<ulr...@we...> wrote:
> Greetings! I am new to matplotlib and python, and encountered a general problem:
> If i try to customize matplotlibrc, nothing changes. I changed the right thing:
> When i try
>
> import matplotlib
> matplotlib.matplotlib_fname()
>
> I get 'C:\\Python25\lib\\site-packages\\matplotlib\\mpl-data\\matplotlibrc'
> (as you see I'm in windows..)
>
> When I f.e. change
>
> #xtick.labelsize : 14 (from '12')
> #xtick.direction : out (from 'in')
>
By default, all lines are commented out. You must remove the leading
'#" symbol to see your changes take effect
JDH

Ulrich vor dem Esche wrote:
> ...
> #xtick.labelsize : 14 (from '12')
> #xtick.direction : out (from 'in')
> 
> nothing changes ...
> I must have missed something very basic..
I guess that would be the "#" which declares everything behind as a comment.
Does it work when you remove the #?
Best,
Sebastian.

Greetings! I am new to matplotlib and python, and encountered a general problem:
If i try to customize matplotlibrc, nothing changes. I changed the right thing:
When i try
import matplotlib
matplotlib.matplotlib_fname()
I get 'C:\\Python25\lib\\site-packages\\matplotlib\\mpl-data\\matplotlibrc'
(as you see I'm in windows..)
When I f.e. change
#xtick.labelsize : 14 (from '12')
#xtick.direction : out (from 'in')
nothing changes at all. My program starts with 'import matplotlib.pyplot as plt', so
that actually matplotlibrc should be in use.. I tried to change other things in
\\matplotlib aswell, they were all ignored. I must have missed something very basic..
What did i miss?
Ulli
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On Tue, Jun 9, 2009 at 4:44 AM, Nan Dun<du...@yl...> wrote:
> Hello,
>
> Currently, in navigation window, the coordinates of cursor show like
> x = "%.1f", y="%.1f"
>
> Is it possible to custom these labels such that they show like
>
> my_x="%.3f", my_y="%.6f"
def my_x(x): return '%.3f'%x
def my_y(y): return '%.3f'%y
ax.fmt_xdata = my_x
ax.fmt_ydata = my_y
JDH

You may just want to start with the "custom_ticker1.py" example here:
http://matplotlib.sourceforge.net/examples/pylab_examples/custom_ticker1.html
The meat of it is just to provide a function that converts the incoming 
values (in your case pixel positions) into whatever you want to be 
displayed.
Cheers,
Mike
Jeremy Lewi wrote:
> I want to let matplotlib control where the tick marks go, but I want 
> to scale the value of the tick labels. For example,
> if my matrix has a 100 columns the tick marks might be [0,25,50,100]. 
> I want to scale these tick labels by some value say .01 so that the 
> corresponding tick labels would be [0,.25,.5,1].
>
> Now say I zoom in on the image so that the xaxis limits are (0,50). 
> Lets suppose the tick marks are now [0,10,20,30,40,50]
> Then in this case the tick labels should be
> [0,.1,.2,.3,.4,.5]
>
> So how do I go about creating a custom formatter?
>
> Thanks
> Jeremy
>
> Michael Droettboom wrote:
>> What are you setting the x ticklabels to? If you want to control how 
>> the numbers are displayed, you can create a custom formatter (which 
>> is basically a function to convert a floating-point number to a 
>> string). If you want to control the number of ticks across the axis, 
>> you can make a custom ticker.
>>
>> If you can describe what your end goal is, I'm happy to describe the 
>> above options in more detail.
>>
>> Cheers,
>> Mike
>>
>> Jeremy Lewi wrote:
>> 
>>> Hi,
>>> I'm using imshow to make an image of a 2-d matrix. I use 
>>> set_xticklabels to adjust the x-axis labels. The problem is that 
>>> when I then zoom in on the plot, the axis labels are not adjusted 
>>> appropriately. Does anyone suggestions on how I can fix this?
>>>
>>> Thanks
>>> Jeremy
>>>
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Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA