matplotlib-users Mailing List for matplotlib

>>>>> "Michael" == Michael P Mossey <mo...@jp...> writes:
 Michael> Is there any different between Subplots and Axes, other
 Michael> than adding a subplot lets one use the matlab 3-digit
 Michael> specification (e.g., 221 )?
Subplot inherits from Axes. It is the special case where your axes
like on a grid, eg 3 rows by 2 columns. An Axes is created by
defining the rectangle [left, bottom, width, height] that the Axes
occupies. Subplot simply computes these for you given the layout
you specify and the subplot parameters from the rc file. These
parameters govern things like the leftmost point of the subplots, or
the horizontal space between the rows. 
Subplot also provides some helper functions like is_last_row which are
useful when creating lots-o-subplots in a loop, where you may want to
set the xlabel only for the last row
for i in range(9):
 ax = subplot(3,3,i+1)
 plot_something(i)
 if ax.is_last_row():
 ax.set_xlabel('time')
Other useful functions are is_first_col, is_first_row, is_last_col and
change_geometry.
See examples/axes_demo.py 
 http://matplotlib.sf.net/screenshots.html#axes_demo
for an example which uses both subplots and axes...
JDH

Is there any different between Subplots and Axes, other than adding a 
subplot lets one use the matlab 3-digit specification (e.g., 221 )?
Mike

Just a simple bar chart question. How do I display the values above each
bar?

 locator = ax.xaxis.get_major_
 ^^^
cut and paste error -- should read
 locator = ax.xaxis.get_major_locator()
JDH

>>>>> "Michael" == Michael P Mossey <mo...@jp...> writes:
 Michael> Is there a way to autoscale just the x axis or just the y
 Michael> axis? Mike
Sort of, kind of. But not automatically <wink>
Turn off autoscaling for the given axes, either
 ax = subplot(111, autoscaleon=False)
or 
 ax.set_autoscaleon(False)
Then, supposing you want to use the autoscaling (locator)
functionality for the x-axis but not y, do 
 ax.set_ylim(somemin, somemax)
 locator = ax.xaxis.get_major_
 ax.set_xlim(locator.autoscale())
With a minimal amount of work we could have an autoscalex and
autoscaley property so that these could be controlled separately.c
JDH

Is there a way to autoscale just the x axis or just the y axis?
Mike

I am using the SVN build of matplotlib last week.
I have included console dumps below.
The first is using pythonw the second using ipython
pythonw anim.py
loaded rc file /Users/smithsm/.matplotlib/matplotlibrc
matplotlib version 0.87.1
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']
$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
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 "anim.py", line 27, in ?
 line, = plot(x,sin(x))
 File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/pylab.py", line 2127, in plot
 b = ishold()
 File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/pylab.py", line 967, in ishold
 return gca().ishold()
 File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/pylab.py", line 918, in gca
 ax = gcf().gca(**kwargs)
 File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/pylab.py", line 928, in gcf
 return figure()
 File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/pylab.py", line 898, in figure
 draw_if_interactive()
 File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/backends/backend_wx.py", line 
1172, in draw_if_interactive
 figManager.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
 ***********************************************
ipython -pylab
loaded rc file /Users/smithsm/.matplotlib/matplotlibrc
matplotlib version 0.87.1
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']
$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([1,2,3])
------------------------------------------------------------------------ 
---
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)
/Users/smithsm/<ipython console>
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/pylab.py in plot(*args, **kwargs)
 2125 def plot(*args, **kwargs):
 2126 # allow callers to override the hold state by passing 
hold=True|False
-> 2127 b = ishold()
 2128 h = popd(kwargs, 'hold', None)
 2129 if h is not None:
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/pylab.py in ishold()
 965 Return the hold status of the current axes
 966 """
--> 967 return gca().ishold()
 968
 969 def isinteractive():
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/pylab.py in gca(**kwargs)
 916 """
 917
--> 918 ax = gcf().gca(**kwargs)
 919 return ax
 920
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/pylab.py in gcf()
 926 return figManager.canvas.figure
 927 else:
--> 928 return figure()
 929
 930 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)
 896 figManager.canvas.figure.number = num
 897
--> 898 draw_if_interactive()
 899 return figManager.canvas.figure
 900
/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
On 11 Mar, 2006, at 10:25, Ken McIvor wrote:
> On Mar 10, 2006, at 2:01 PM, Onsi Fakhouri wrote:
>> Ken, if you want me to try something let me know -- my guess is 
>> I'm using a different version of either the AGG library or wx.
>
> I'm afraid that I'm at a loss right now. Knowing exactly what 
> version of MacOS, Python, wxPython, and matplotlib you're using 
> might help.
>
> If you have MacOS 10.4, Python 2.3, and wxPython 2.6.2.1, then you 
> could see if you have the same problem with my build of matplotlib:
>
> 	http://agni.phys.iit.edu/~kmcivor/downloads/matplotlib-0.87.1- 
> py2.3-macosx-10.4-ppc.egg
>
>> As an aside, does the cpp implementation run much faster than the 
>> python implementation?
>
> You probably won't notice a difference unless you're doing 
> animations. If you are, then it provides a big speedup under Linux 
> but much less of a speedup on a Mac. I think the difference is due 
> to the way wxWidgets is implemented on the two platforms.
>
> Ken
>
>
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>>>>> "Yogesh" == Yogesh Wadadekar <wad...@st...> writes:
 Yogesh> Hi,
 Yogesh> I would like to do the following:
 Yogesh> 1. Display an image using pylab.imshow. Works well and I
 Yogesh> am happy with the v1,v2 values that are auto computed.
 Yogesh> Next I need to:
 Yogesh> 2. Display a second image using the EXACT v1,v2 values
 Yogesh> that matplotlib determined for the first image.
 Yogesh> I read through the documentation for
 Yogesh> matplotlib.image.AxesImage that the fisrt imshow would
 Yogesh> return, but could not determine exactly how to access the
 Yogesh> v1,v2 values for that object.
You can access the vmin and vmax attributes from the image
normalization instance and pass them on to subsequent images
 In [3]: im = imshow(rand(20,20))
 In [4]: im.norm.vmin
 Out[4]: 0.001056874287314713
 In [5]: im.norm.vmax
 Out[5]: 0.99817508459091187
 In [6]: newim = imshow(rand(30,30), vmin=im.norm.vmin, vmax=im.norm.vmax)
FYI, imshow returns an image.AxesImage (which derives from
colors.ScalarMappable) and this contains a colors.normalize instance,
which has the attributes you are looking for. The clim command works
by setting the vmin and vmax attrs. More details are documented here:
 http://matplotlib.sourceforge.net/matplotlib.image.html#AxesImage
 http://matplotlib.sourceforge.net/matplotlib.cm.html#ScalarMappable
 http://matplotlib.sourceforge.net/matplotlib.colors.html#normalize
JDH

Hi,
I would like to do the following:
1. Display an image using pylab.imshow. Works well and I am happy with the
v1,v2 values that are auto computed.
Next I need to:
2. Display a second image using the EXACT v1,v2 values that matplotlib
determined for the first image.
I read through the documentation for matplotlib.image.AxesImage that the
fisrt imshow would return, but could not determine exactly how to access
the v1,v2 values for that object.
Thanks in advance for your help.
Yogesh
Yogesh Wadadekar			 Tel: (410)338-4993
Space Telescope Science Institute e-mail: wad...@st...
3700 San Martin Drive
Baltimore, MD 21218

Last week I got this message several times.
This is a test to see if I still have this problem.
Your message did not reach some or all of the intended recipients.
 Subject:	FW: [Matplotlib-users] update to: I can not get
matplotlib to work on a windows xp professional machine
 Sent:	3/8/2006 1:00 PM
The following recipient(s) could not be reached:
 mat...@li... on 3/8/2006 1:04 PM
 There was a SMTP communication problem with the recipient's
email server. Please contact your system administrator.
 < -a #5.5.0 SMTP; 550 Don't like your HELO/EHLO. Hostname
must contain a dot.>

John Hunter wrote:
>>>>>>"Marc" == Marc AHRENS <ma...@ph...> writes:
> 
> Marc> NB The absence of an "app.MainLoop()" call at the end, since
> Marc> I've called this from ipython, which is supposed to be
> Marc> clever and automatically the wxPython main loop in another
> Marc> thread automatically (I read this somewhere). I've tried
> Marc> running multi-threaded stuff from the regular python shell,
> Marc> but without success.
> 
> ipython is only clever if you launch it in ipython -pylab for pylab
> mode (which is not compatible with MPlot) or if launched in the
> --wthread mode for wx threading. So you'll definitely need to do the
> latter. I haven't had a lot of experience with --wthread; is it
> correct that if you use wthread you should not use the explicit call
> to Mainloop?
No, in ipython -wthread we hijack Mainloop so that user calls to it actually 
call a dummy function. So it /should/ be OK for user scripts (as long as 
-wthread was given, or -pylab with a WX* backend) to call Mainloop. It will 
just call ipython's dummy replacement.
See
http://projects.scipy.org/ipython/ipython/browser/ipython/trunk/IPython/Shell.py
for details.
Cheers,
f