matplotlib-users Mailing List for matplotlib

Hi Ryan,

On Sat, 25 Feb 2006, Ryan Krauss wrote:

> This is sort of not a matplotlib specific question, but it seems like
> people on this list might be able to point me in some good directions.
>  I need to give a lecture on feedback control systems.  I would like
> to talk about stabalizing unstable systems and use an inverted
> pendulum for an example.  I know that Matlab had a demo like this that
> included a fairly neat 2D visualization of a cart moving back and
> forth with an inverted pendulum on it.  I would need to run a
> simulation in the background that outputs the cart position and the
> pendulum angle and then I would want to create an animation of the
> cart and pendulum moving around.
>
> Can anyone recommend a python package for doing this kind of animation?

First, you might try to use techniques described at
  http://new.scipy.org/Wiki/Cookbook/Matplotlib/Animations
If you have a reasonably fast machine it might already work out
fine enough.
Other options are pygame (never used it myself)
and Vpython (www.vpython.org) which can do some very nice things
with remarkably little code.

Best, Arnd

This is sort of not a matplotlib specific question, but it seems like
people on this list might be able to point me in some good directions.
 I need to give a lecture on feedback control systems.  I would like
to talk about stabalizing unstable systems and use an inverted
pendulum for an example.  I know that Matlab had a demo like this that
included a fairly neat 2D visualization of a cart moving back and
forth with an inverted pendulum on it.  I would need to run a
simulation in the background that outputs the cart position and the
pendulum angle and then I would want to create an animation of the
cart and pendulum moving around.

Can anyone recommend a python package for doing this kind of animation?

Thanks,

Ryan

I'm having problems compiling matplotlib. I'm running suse 9.3 (linux) and
have python:
Python 2.4.1 (#1, Sep 13 2005, 00:39:20)

I downloaded matplotlib-0.87.tar.gz, and have not changed the setup.py or 
setupext.py at all. I think I have all the graphics things installed.

The error message goes:
>>> [snip]
building 'matplotlib._agg' extension
creating build/temp.linux-i686-2.4
creating build/temp.linux-i686-2.4/src
creating build/temp.linux-i686-2.4/agg23
creating build/temp.linux-i686-2.4/agg23/src
gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -march=i586 -mtune=i686 
-fmessage-length=0 -Wall -D_FORTIFY_SOURCE=2 -g -I/usr/X11R6/include -fPIC 
-Iagg23/include -Isrc -Iswig -I/usr/include/python2.4 -c src/agg.cxx -o 
build/temp.linux-i686-2.4/src/agg.o
cc1plus: error: invalid option `tune=i686'
error: command 'gcc' failed with exit status 1

>>  gcc --version
gcc (GCC) 3.3.5 20050117 (prerelease) (SUSE Linux)
Copyright (C) 2003 Free Software Foundation, Inc.

I cant find anywhere in the matplotlib-0.87 directory structure that sets 
this "tune=i686". I have searched all the files in the directory structure 
for "tune" and "i686", so I'm guessing it's set somewhere else, but I dont 
know where.
Can anyone help?

thanks
Sue

On Saturday 25 February 2006 12:32, Samuel M. Smith wrote:
> Rob,
>
> Is there a way for matplotlib to use the latex fonts in the plot
> window not just in the saved version of the graph?
> Even when I have usetex True it picks a font from the font list given
> in the matplotlibrc file.

This is a new feature, it uses the font list to select the appropriate latex 
font, and the same font is used in the saved version.

> How do I force it to use the type1cm or pslatex fonts?

For type1cm, use:

font.serif : serif (or "computer modern roman")
font.sans-serif : sans-serif (or "computer modern sans-serif")
font.monospace : monospace (or "computer modern typewriter")

for pslatex, use:

font.serif : times
font.sans-serif : helvetica
font.monospace : courier

I'm planning on updating the usetex wiki page, I just havent had time to do it 
yet.

Darren

Rob,

Is there a way for matplotlib to use the latex fonts in the plot  
window not just in the saved version of the graph?
Even when I have usetex True it picks a font from the font list given  
in the matplotlibrc file.
How do I force it to use the type1cm or pslatex fonts?

Sam

There are several fonts installed by matplotlib into the mpl_data  
folder. The names or
sort of cryptic. I tried matching them up with the family names in  
the matplotlibrc file list for
font.serif
font.sans-serif

but the only one that makes sense is Bitstream Vera
What is the family name for cmt, cms cmex and also the pXXX.afm fonts?







**********************************************************************
Samuel M. Smith Ph.D.
2966 Fort Hill Road
Eagle Mountain, Utah 84043
801-768-2768 voice
801-768-2769 fax
**********************************************************************
"The greatest source of failure and unhappiness in the world is
giving up what we want most for what we want at the moment"
**********************************************************************

Setting the WX_CONFIG environment variable before the build fixed one  
problem. It is now finding my matplotlibrc file.

I thought maybe it was a font corruption problem but it I use TkAgg  
everything works fine with my 0.87.1cvs build. So
I think maybe I have uncovered a bug in the WXAgg? I would like to  
help fix it but I don't have a clue of where to start.

I also tried WxAgg with the first fonts in the rc file set to the  
ones that come installed with matplotlib
font.serif          : Bitstream Vera Serif
font.sans-serif     : Bitstream Vera Sans

and it still crashes. So something is wrong. Maybe its my  
environment. It would be nice if someone could verify
if they get the same problem


Here is the debug output

AlBook:smithsm$ ipython -pylab
loaded rc file /Users/smithsm/.matplotlib/matplotlibrc
matplotlib version 0.87.1cvs
verbose.level debug
interactive is False
platform is darwin
loaded modules: ['IPython.Prompts', '_bisect', 'distutils',  
'IPython.iplib', 'IPython.signal', 'random', 'IPython.FakeModule',  
'datetime', 'matplotlib.tempfile', 'IPython.bdb',  
'distutils.sysconfig', 'pytz.datetime', 'IPython.time', 'struct',  
're', 'tempfile', 'pprint', 'IPython.copy_reg', 'imp',  
'IPython.OInspect', 'collections', 'IPython.pydoc',  
'IPython.cStringIO', 'zipimport', 'IPython.codecs', 'string',  
'matplotlib.dateutil', 'IPython.imp', 'repr',  
'matplotlib.__future__', 'pytz.tzinfo', 'IPython.Itpl',  
'IPython.Debugger', 'new', 'distutils.re', 'IPython.excolors',  
'IPython.Queue', 'IPython.os', 'resource', 'bisect', 'IPython.glob',  
'signal', 'cmd', 'pydoc', 'threading', 'token', 'shlex',  
'pytz.bisect', 'IPython.shlex', 'matplotlib.pytz',  
'IPython.exceptions', 'IPython.new', 'dis', 'cStringIO', 'locale',  
'IPython.path', 'Queue', 'IPython.types', 'atexit',  
'IPython.commands', 'encodings', 'IPython.threading', 'bdb',  
'IPython.ConfigLoader', 'matplotlib.warnings', 'matplotlib.sys',  
'encodings.types', 'posix', 'encodings.ascii', 'math',  
'IPython.platutils_dummy', 'fcntl', 'IPython.profile',  
'IPython.platutils_win32', 'dateutil', 'optparse', 'UserDict',  
'inspect', 'distutils.os', 'matplotlib', 'IPython.hooks',  
'exceptions', 'codecs', 'getopt', 'md5', 'IPython.ColorANSI',  
'commands', 'socket', 'thread', 'sre', 'IPython.StringIO',  
'traceback', 'IPython.pstats', 'pkg_resources', 'itertools',  
'opcode', 'pstats', 'IPython.tokenize', 'distutils.sys', 'os', 'pdb',  
'IPython.traceback', '__future__', '_sre', 'IPython.Shell',  
'__builtin__', 'IPython', 'distutils.string', 'matplotlib.datetime',  
'IPython.codeop', 'posixpath', 'popen2', 'errno', '_socket',  
'binascii', 'IPython.sys', 'IPython.re', 'sre_constants',  
'IPython.platutils_posix', 'IPython.PyColorize', 'matplotlib.md5',  
'types', 'IPython.genutils', 'tokenize', 'IPython.pdb', 'cPickle',  
'pytz.sys', 'IPython.platutils', 'IPython.macro', '_codecs',  
'IPython.token', '_locale', 'IPython.keyword', 'IPython.IPython',  
'IPython.string', 'pytz', 'IPython.__builtin__', 'copy',  
'matplotlib.os', 'IPython.socket', 'IPython.resource', 'IPython.cmd',  
'keyword', 'StringIO', 'IPython.linecache', 'IPython.__main__',  
'encodings.aliases', 'fnmatch', 'sre_parse', 'IPython.ultraTB',  
'IPython.tempfile', 'IPython.Release', 'IPython.OutputTrap',  
'copy_reg', 'sre_compile', '_random', 'site', 'IPython.getopt',  
'IPython.ipstruct', 'IPython.inspect', '__main__', 'shutil',  
'IPython.Magic', 'IPython.pprint', 'strop', 'IPython.bisect',  
'IPython.textwrap', 'IPython.shutil', 'encodings.codecs', 'gettext',  
'IPython.Logger', 'IPython.fnmatch', 'encodings.exceptions',  
'pytz.sets', 'profile', 'IPython.wildcard', 'stat', '_ssl',  
'warnings', 'IPython.deep_reload', 'glob', 'sets', 'textwrap', 'sys',  
'IPython.ipmaker', 'codeop', 'os.path', 'IPython.background_jobs',  
'IPython.DPyGetOpt', 'IPython.cPickle', 'IPython.usage',  
'matplotlib.distutils', 'distutils.errors', 'marshal',  
'IPython.__future__', 'linecache', 'matplotlib.shutil', 'time',  
'IPython.ipapi']
numerix numpy 0.9.5.2006
font search path ['/Library/Frameworks/Python.framework/Versions/2.4/ 
lib/python2.4/site-packages/matplotlib/mpl-data']
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/cmtt10.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/VeraMoBd.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/VeraMoBI.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/VeraBd.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/VeraSeBd.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/VeraMono.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/cmsy10.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/cmex10.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/cmmi10.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/VeraIt.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/cmr10.ttf
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/mpl-data/Vera.ttf
$HOME=/Users/smithsm
CONFIGDIR=/Users/smithsm/.matplotlib
loaded ttfcache file /Users/smithsm/.matplotlib/ttffont.cache
matplotlib data path /Library/Frameworks/Python.framework/Versions/ 
2.4/lib/python2.4/site-packages/matplotlib/mpl-data
backend WXAgg version 2.6.2.1
Python 2.4.2 (#3, Jan  8 2006, 20:33:07)
Type "copyright", "credits" or "license" for more information.

IPython 0.7.1.fix1 -- An enhanced Interactive Python.
?       -> Introduction to IPython's features.
%magic  -> Information about IPython's 'magic' % functions.
help    -> Python's own help system.
object? -> Details about 'object'. ?object also works, ?? prints more.

   Welcome to pylab, a matplotlib-based Python environment.
   For more information, type 'help(pylab)'.

In [1]: plot([-2.345,-12.349])
------------------------------------------------------------------------ 
---
exceptions.MemoryError                               Traceback (most  
recent call last)

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/backends/backend_wx.py in _onPaint(self, evt)
    1046             self.realize()
    1047         # Render to the bitmap
-> 1048         self.draw(repaint=False)
    1049         # Update the display using a PaintDC
    1050         self.gui_repaint(drawDC=wx.PaintDC(self))

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/backends/backend_wxagg.py in draw(self, repaint)
      60         FigureCanvasAgg.draw(self)
      61
---> 62         self.bitmap = _convert_agg_to_wx_bitmap 
(self.get_renderer(), None)
      63         if repaint:
      64             self.gui_repaint()

MemoryError: _wxagg.convert_agg_to_wx_bitmap(): could not create the  
wx.Bitmap
------------------------------------------------------------------------ 
---
exceptions.MemoryError                               Traceback (most  
recent call last)

/Install/Python/MacPython/Python2.4.2/MatPlotLib/examples/<ipython  
console>

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/pylab.py in plot(*args, **kwargs)
    2122 def plot(*args, **kwargs):
    2123     # allow callers to override the hold state by passing  
hold=True|False
-> 2124     b = ishold()
    2125     h = popd(kwargs, 'hold', None)
    2126     if h is not None:

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/pylab.py in ishold()
     962     Return the hold status of the current axes
     963     """
--> 964     return gca().ishold()
     965
     966 def isinteractive():

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/pylab.py in gca(**kwargs)
     913     """
     914
--> 915     ax =  gcf().gca(**kwargs)
     916     return ax
     917

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/pylab.py in gcf()
     923         return figManager.canvas.figure
     924     else:
--> 925         return figure()
     926
     927 def gci():

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/pylab.py in figure(num, figsize, dpi, facecolor,  
edgecolor, frameon)
     893         figManager.canvas.figure.number = num
     894
--> 895     draw_if_interactive()
     896     return figManager.canvas.figure
     897

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/IPython/genutils.py in wrapper(*args, **kw)
     802     def wrapper(*args,**kw):
     803         wrapper.called = False
--> 804         out = func(*args,**kw)
     805         wrapper.called = True
     806         return out

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/backends/backend_wx.py in draw_if_interactive()
    1170         figManager = Gcf.get_active()
    1171         if figManager is not None:
-> 1172             figManager.canvas.draw()
    1173
    1174

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/backends/backend_wxagg.py in draw(self, repaint)
      60         FigureCanvasAgg.draw(self)
      61
---> 62         self.bitmap = _convert_agg_to_wx_bitmap 
(self.get_renderer(), None)
      63         if repaint:
      64             self.gui_repaint()

MemoryError: _wxagg.convert_agg_to_wx_bitmap(): could not create the  
wx.Bitmap

In [2]:  
------------------------------------------------------------------------ 
---
exceptions.MemoryError                               Traceback (most  
recent call last)

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/backends/backend_wx.py in _onPaint(self, evt)
    1046             self.realize()
    1047         # Render to the bitmap
-> 1048         self.draw(repaint=False)
    1049         # Update the display using a PaintDC
    1050         self.gui_repaint(drawDC=wx.PaintDC(self))

/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/backends/backend_wxagg.py in draw(self, repaint)
      60         FigureCanvasAgg.draw(self)
      61
---> 62         self.bitmap = _convert_agg_to_wx_bitmap 
(self.get_renderer(), None)
      63         if repaint:
      64             self.gui_repaint()

MemoryError: _wxagg.convert_agg_to_wx_bitmap(): could not create the  
wx.Bitmap

Hi David,

I was in non interactive mode. But I finally solved the problem by replacin=
g=20
the GTKAgg backend by the TkAgg one. I don't understand why the GTKAgg does=
=20
not work, but well... if the TkAgg does...

Emmanuel

Le Vendredi 24 F=C3=A9vrier 2006 16:47, David TREMOUILLES a =C3=A9crit=C2=
=A0:
>    >>2006/2/24, David Huard <dav...@gm... >:
>    >>What if I want it to be non-interactive ? I want to save graphics
>    >>directly to a file from a script, without them being displayed. It's
>    >>weird that in this case close() crashes the whole thing.
>
> Yes your wright the script have to work in non interactive mode. (I was
> just trying to give an explanation to Emmanuel problem).
> The following script should work (but it crashes like Emmanuel reported):
>
> #!/usr/bin/python
> import matplotlib
> import pylab
> #Turn off interactive mode
> matplotlib.interactive(False)
> #plot figure 1
> pylab.figure()
> pylab.plot([1,2,3],[1,2,3])
> pylab.savefig("test_pylab1.png")
> pylab.close()
> #plot figure 2
> pylab.figure()
> pylab.plot([1,2,3],[1,2,3])
> pylab.savefig("test_pylab2.png")
> pylab.close()
>
> Second figure cannot be created due to the crash.
>
> We need the help of matplotlib Gurus !
>
> Regards,
>
> David
>
> 2006/2/24, David Huard <dav...@gm...>:
> > What if I want it to be non-interactive ? I want to save graphics
> > directly to a file from a script, without them being displayed. It's
> > weird that in this case close() crashes the whole thing.
> >
> > David
> >
> > 2006/2/23, David TREMOUILLES < dav...@gm...>:
> > > Could that be because interactive mode was set in your previous insta=
ll
> >
> > ?
> >
> > >  (in .matplotlibrc file)
> > >  if I try:
> > >
> > > #!/usr/bin/python
> > >  import matplotlib
> > >  import pylab
> > >  matplotlib.interactive(True)
> > >  pylab.figure()
> > >  pylab.close()
> > >
> > >  Then it works...
> > >  Hope this  could help you...
> > >
> > >  David
> > >
> > > 2006/2/23, Emmanuel Pecontal <pec...@ob...>:
> > > > Hello,
> > > >
> > > > If I run the following script on my system (SuSE 10.0,
> > > > matplotlib-0.87but same behaviour with 0.86):
> > > >
> > > > #!/usr/bin/python
> > > >
> > > > import matplotlib
> > > > import pylab
> > > >
> > > > pylab.figure()
> > > > pylab.close ()
> > > >
> > > > It crashes with the following error message:
> > > >
> > > > Traceback (most recent call last):
> > > >   File "./tmp.py", line 8, in ?
> > > >     pylab.close()
> > > >   File
> > >
> > > "/usr/lib/python2.4/site-packages/matplotlib/pylab.py",
> > > line 768, in
> > >
> > > > close
> > > >     else: _pylab_helpers.Gcf.destroy(figManager.num)
> > > >   File
> > >
> > > "/usr/lib/python2.4/site-packages/matplotlib/_pylab_helpers.py",
> > > line
> > >
> > > > 28, in destroy
> > > >     figManager.destroy()
> > > >   File
> > >
> > > "/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py",
> > >
> > > > line 456, in destroy
> > > >     gtk.main_quit()
> > > > RuntimeError: called outside of a mainloop
> > > >
> > > > Does someone has an idea of the problem?
> > > > I didn't have this kind of problem with my SuSE 9.3 and
> >
> > matplotlib-0.85
> >
> > > > --
> > > > Emmanuel P=C3=A9contal
> > > >
> > > > CRAL - Observatoire de Lyon
> > > > 9, Av. Charles Andre
> > > > F-69561 Saint Genis Laval Cedex
> > > >
> > > > tel (33) (0)4.78.86.83.76 - fax (33) (0)4.78.86.83.86
> > > >
> > > > email : pec...@ob...

=2D-=20
Emmanuel P=C3=A9contal

CRAL - Observatoire de Lyon
9, Av. Charles Andre
=46-69561 Saint Genis Laval Cedex

tel (33) (0)4.78.86.83.76 - fax (33) (0)4.78.86.83.86

email : pec...@ob...
~

David Chin wrote:
> Is it possible to layer a translucent contourf over an image?
> 
> I tried the obvious, but it didn't seem to work:
> 
> im = imshow(Z, interpolation='nearest', extent=extent, cmap=cm.bone)
> v = axis()
> cset = contourf(Z2, levels, hold='on', cmap=cm.jet, extent=extent, alpha=0.6)


Dave,

You are right, that should work, but it doesn't--support for the alpha 
kwarg just isn't there.  I'll fix it.  Thanks for pointing it out.

Eric

Sorry guys, just wrong file name and synyax lol.

Titi

--- Titi Anggono <tia...@ya...> wrote:

> Hi all,
> 
> I read in the manual that we can save file as
> binary.
> I tried following code and got error, I would like
> to
> have your comment.
> 
> =========================
> import Numeric
> import pylab
> 
> #ascii.dat is two dimensional array
> fout=pylab.load('C:/Python23/code/ascii.dat')
> t=fout[:,0]
> x=fout[:,1]
> X=Numeric.zeros((len(t),2),Numeric.Float)
> X[:,0]=t
> X[:,1]=x
> #I want to save as one dimensional array
>
file('C:/Python23/code/asciiBinary.dat','wb').write(X.tostring())
> ==============================
> the error is :
> Traceback (most recent call last):
>   File "C:/Python23/code/asciiBinary.py", line 4, in
> -toplevel-
>     fout=pylab.load('C:/Python23/code/ascii.dat')
>   File
> "C:\Python23\Lib\site-packages\matplotlib\pylab.py",
> line 1006, in load
>     r,c = X.shape
> ValueError: unpack tuple of wrong size
> 
> 
> Thanks
> Titi
> 
> 
> 
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Hi all,

I read in the manual that we can save file as binary.
I tried following code and got error, I would like to
have your comment.

=========================
import Numeric
import pylab

#ascii.dat is two dimensional array
fout=pylab.load('C:/Python23/code/ascii.dat')
t=fout[:,0]
x=fout[:,1]
X=Numeric.zeros((len(t),2),Float)
X[:,0]=t
X[:,1]=s
#I want to save as one dimensional array
file('C:/Python23/code/asciiBinary.dat','wb').write(X.tostring())
==============================
the error is :
Traceback (most recent call last):
  File "C:/Python23/code/asciiBinary.py", line 4, in
-toplevel-
    fout=pylab.load('C:/Python23/code/ascii.dat')
  File
"C:\Python23\Lib\site-packages\matplotlib\pylab.py",
line 1006, in load
    r,c = X.shape
ValueError: unpack tuple of wrong size


Thanks
Titi



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I had similar problems with zooming in extremely far.  My work around
was to use masked arrays before zooming.  Not perfect, but it worked.

On 2/24/06, John Hunter <jdh...@ac...> wrote:
> >>>>> "James" =3D=3D James Boyle <bo...@ll...> writes:
>
>     James> Note that the y array has a screwy point - 1.0e18.  What
>     James> happens is that the first plot ('plot1') looks fine but the
>
> This is an Agg bug and is unrelated to ticking.  In the agg routine
> for drawing a dashed line we are getting the freeze.  This occurs in
> the agg code and not in the matplotlib agg wrappers, so it will take
> some work to fix.  Basically I need to isolate a pure agg C++ example
> and hope Maxim can find a good solution.
>
> The basic problem occurs when you set your viewlimits to be such a
> small part of the data space that the transformed figure coordinate of
> your data point is in outer space.  In your case the transformed
> coordinates with a viewlim set to 0,7 on an 800x600 canvas are
>
>  100 540
>  168.889 471.429
>  237.778 402.857
>  306.667 334.286
>  375.556 265.714
>  444.444 197.143
>  513.333 128.571
>  582.222 60
>  651.111 -8.57143
>  720 -6.85714e+19
>
> It is possible that an earlier version handled this differently, as I
> did refactor that part of the code at one point ....
>
> Thanks for the report -- I'll keep you posted if I can figure out
> something.  One workaround is to drop points in the agg backend that
> are far removed from the canvas, but this isn't ideal, since it could
> lead to misleading results in zoomed images.
>
> JDH
>
>
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I found wx-config in
/usr/local/lib/wxPython-ansi-2.6.2.1/bin

./wx-config --version
2.6.2

there is another wx-config in /usr/bin that returns 2.5.3 for the  
version

in setupext.py  is the following function

def find_wx_config():
     """If the WX_CONFIG environment variable has been set, returns  
it value.
     Otherwise, search for `wx-config' in the PATH directories and  
return the
     first match found.  Failing that, return None.
     """

     wxconfig = os.getenv('WX_CONFIG')
     if wxconfig is not None:
         return wxconfig

     path = os.getenv('PATH') or ''
     for dir in path.split(':'):
         wxconfig = os.path.join(dir, 'wx-config')
         if os.path.exists(wxconfig):
             return wxconfig

     return None

I checked and I didn't have WX_CONFIG environment variable set to  
anything.

so I set the environment variable

export WX_CONFIG="usr/local/lib/wxPython-ansi-2.6.2.1/bin/wx-config"
AlBook:smithsm$ echo $WX_CONFIG
usr/local/lib/wxPython-ansi-2.6.2.1/bin/wx-config

I removed the build directory rm -r build then I
python setup.py clean
python setup.py build
sudo python setup.py clean

but the problem does not go away!
  from the debug output below it states that
the WXAgg backend is version 2.6.2.1
So I don't know what to do?

pythonw simple_plot.py --verbose-helpful
matplotlib data path /Library/Frameworks/Python.framework/Versions/ 
2.4/lib/python2.4/site-packages/matplotlib/mpl-data
$HOME=/Users/smithsm
CONFIGDIR=/Users/smithsm/.matplotlib
loaded rc file /Users/smithsm/.matplotlib/matplotlibrc
matplotlib version 0.87.1cvs
verbose.level helpful
interactive is False
platform is darwin
numerix numpy 0.9.5.2006
font search path ['/Library/Frameworks/Python.framework/Versions/2.4/ 
lib/python2.4/site-packages/matplotlib/mpl-data']
loaded ttfcache file /Users/smithsm/.matplotlib/ttffont.cache
backend WXAgg version 2.6.2.1
Traceback (most recent call last):
   File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/backends/backend_wx.py", line  
1048, in _onPaint
     self.draw(repaint=False)
   File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/backends/backend_wxagg.py", line  
62, in draw
     self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
MemoryError: _wxagg.convert_agg_to_wx_bitmap(): could not create the  
wx.Bitmap
Traceback (most recent call last):
   File "simple_plot.py", line 16, in ?
     show()
   File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/backends/backend_wx.py", line  
1193, in show
     figwin.canvas.draw()
   File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/backends/backend_wxagg.py", line  
62, in draw
     self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
MemoryError: _wxagg.convert_agg_to_wx_bitmap(): could not create the  
wx.Bitmap
AlBook:smithsm$


On 24 Feb, 2006, at 15:33, Christopher Barker wrote:

> Samuel M. Smith wrote:
>> MemoryError: _wxagg.convert_agg_to_wx_bitmap(): could not create  
>> the wx.Bitmap
>
> yes, if you are running OS-X 10.4. OS-X 10.4 comes with a version  
> of wxPython pre-installed. It's an older version that you probably  
> don't want to use, plus it's installed for python 2.3.5
>
> However, when you need to build wx code (which the wxagg back-end  
> does), you can use the wx-config utility to find out what libs to  
> link etc. Apple has installed a wx-config into /usr/bin/wx-config  
> that points to their install of wx. You need to make sure MPL uses  
> the wx-config that came with the version of wxPython you installed  
> instead.
>
> I think it's in /usr/local/lib/wxPython-Something-or-other/bin/ 
> wxconfig
>
> There is an environment variable you can set to tell MPL's setup.py  
> where to look for it. It escapes me for the moment what it's  
> called, but poke around setup.py and friends and you'll find it.
>
> When you've got this all working, it would be great if you could  
> contribute a binary mpkg to pythonmac.org.
>
> How did you link libpng and libfreetype? Statically I hope, so that  
> a binary would be useful to everyone.
>
> -Chris
>
>
>
> -- 
> Christopher Barker, Ph.D.
> Oceanographer
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>
>
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