matplotlib-users Mailing List for matplotlib

Charles R. Twardy wrote:
> For some reason, the FIRST time I try to plot something in an ipython
> session, I get:
> 
> SystemError: ../Objects/moduleobject.c:48: bad argument to internal function
> 
>>/usr/lib/python2.3/site-packages/matplotlib/pylab.py(774)figtext()
> 
> -> ret = gcf().text(*args, **kwargs)
> 
> The last entry in the stacktrace is:
> /usr/lib/python2.3/site-packages/matplotlib/pylab.py in figtext(*args,
> **kwargs) 772 def figtext(*args, **kwargs):
> 773
> --> 774 ret = gcf().text(*args, **kwargs)
> 775 draw_if_interactive()
> 776 return ret
> 
> After that everything works fine. This error is robust: every first
> plot in ipython. Haven't tried command-line yet.
Mmh, this may be the tip of the thread to unravel a long-standing problem 
which has stumped both John and me several times. I've seen the message
SystemError: ../Objects/moduleobject.c:48: bad argument to internal function
when using the GtkAgg backend, but the funny thing is that the issue wouldn't 
appear for John even when we were both running _as the same user, on the same 
box_. The only difference was that I was executing from the console and he 
was logged in remotely. However, in that case it would always silently 
segfault, so we never saw the traceback you are seeing, which made the problem 
very hard to debug without really sinking time into it. But with your 
behavior, we may get more info.
Some things to try which will help:
1. Version info, for everything (OS, python, ipython, mpl, gcc)
2. In ipython, type 'xmode verbose' before testing, and paste the entire 
ipython traceback. I don't care if it's big, for this problem anything can help.
3. Backend info. Try cycling through all the backends, and see if the problem 
appears with all or only with some.
With more details, it may be possible to make some progress on this one...
Cheers,
f

For some reason, the FIRST time I try to plot something in an ipython
session, I get:
SystemError: ../Objects/moduleobject.c:48: bad argument to internal functio=
n
> /usr/lib/python2.3/site-packages/matplotlib/pylab.py(774)figtext()
-> ret =3D gcf().text(*args, **kwargs)
The last entry in the stacktrace is:
/usr/lib/python2.3/site-packages/matplotlib/pylab.py in figtext(*args,
**kwargs) 772 def figtext(*args, **kwargs):
 773
--> 774 ret =3D gcf().text(*args, **kwargs)
 775 draw_if_interactive()
 776 return ret
After that everything works fine. This error is robust: every first
plot in ipython. Haven't tried command-line yet.
-C
--
Charles R. Twardy

Hi Folks,
Has anyone got any code for making a Wind Rose with MPL? (I'd like to hear 
about other pythonic methods too)
If you don't know what a Wind Rose is, you probably don't have code for making 
one, but just in case you're curious, it's essentially a histogram in polar 
coordinates. It can show you what fraction of the time the wind (or any 
directional phenomenon) is is blowing from what direction.
here's some examples:
http://www.enviroware.com/windrose.htm
Or google it yourself.
If you don't mind self contained, Windows only software!
Thanks
-Chris
PS: Jeff, I cc's you, because you seemed a very likely candidate for having 
something.
-- 
Christopher Barker, Ph.D.
Oceanographer
 		
NOAA/OR&R/HAZMAT (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chr...@no...

Dear John,
Thanks for your support.
Pressing the X/Y key works fine in the pan menu! I tested it!
But my first suggestion would be an additional keyword in the subplot 
command, something like:
ax2 = subplot(312, sharex=ax1, freezey=True)
In fact, there would be necessary 2 additional keywords (freezex, 
freezey) that would disable
limit changes after the subplot creation. Obviouly, if freezey=False or 
None, the axis limits would
be free to be changed by the zooming tool.
Clovis
John Hunter wrote:
>>>>>>"Clovis" == Clovis Goldemberg <cl...@pe...> writes:
>>>>>> 
>>>>>>
>
> Clovis> When I use the zoom feature of the NavigationToolbar, the
> Clovis> xaxis is shared between all 3 graphs. But the yaxis
> Clovis> limits are free. Obviously, they could also be shared but
> Clovis> this is not want I want. I would like to "force" or
> Clovis> "freeze" the Y axis to a given value. Consequently, the
> Clovis> zoom feature would act only along the X axis.
>
>When using the right mouse zoom in pan/zoom mode, if you hold 'x' down
>the zoom will only be in the x direction. ditto for 'y'. It would be
>nice to support this for zoom to rect as well. On the todo list!
>
>JDH
>
>
>-------------------------------------------------------
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>
>
> 
>

>>>>> "Clovis" == Clovis Goldemberg <cl...@pe...> writes:
 Clovis> When I use the zoom feature of the NavigationToolbar, the
 Clovis> xaxis is shared between all 3 graphs. But the yaxis
 Clovis> limits are free. Obviously, they could also be shared but
 Clovis> this is not want I want. I would like to "force" or
 Clovis> "freeze" the Y axis to a given value. Consequently, the
 Clovis> zoom feature would act only along the X axis.
When using the right mouse zoom in pan/zoom mode, if you hold 'x' down
the zoom will only be in the x direction. ditto for 'y'. It would be
nice to support this for zoom to rect as well. On the todo list!
JDH

Consider the following code (adapted from shared_axis_demo.py):
from pylab import *
t = arange(0.01, 5.0, 0.01)
s1 = sin(2*pi*t)
s2 = sin(4*pi*t)
s3 = sin(6*pi*t)
ax1 = subplot(311)
plot(t,s1)
grid('True')
ax2 = subplot(312, sharex=ax1)
plot(t, s2)
grid('True')
ax3 = subplot(313, sharex=ax1)
plot(t, s3)
grid('True')
show()
When I use the zoom feature of the NavigationToolbar, the xaxis is 
shared between all 3 graphs.
But the yaxis limits are free. Obviously, they could also be shared but 
this is not want I want.
I would like to "force" or "freeze" the Y axis to a given value. 
Consequently, the zoom feature would act only
along the X axis.
Any ideas??
Clovis Goldemberg
University of Sao Paulo

Apologies for the double-post.
An update: installing scipy, then rebuilding and reinstalling 
matplotlib get things working using Numeric; numarray still fails. That 
fragility makes me worry something is still wrong, but I just got a 
basic test plot (1,2,3) to display using ipython, and that's good enough 
for me for now. Advice would still be welcome, but is no longer as 
desperate. =)
Also, I should have mentioned that the machine in question is Ubuntu 
5.10 PPC. Tomorrow I'll see if I can get matplotlib successfully 
installed on the MacOS X side...
Hoping this message helps someone else down the line (and that the list 
will forgive me asking and then answering my own question...),
Andrew Stout
Andrew Stout wrote:
> Hi--
> 
> I'm trying to get matplotlib installed on my laptop before my holiday 
> travels begin. I've acquired all the dependencies through synaptic and 
> built matplotlib from source, but when I attempt to import pylab I get 
> the following error:
> 
> andrew@idioteque:~/.matplotlib$ python
> Python 2.4.2 (#2, Sep 30 2005, 22:23:39)
> [GCC 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu8)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import pylab
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "lines.data_clipping" on line 55 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.major.size" on line 145 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.minor.size" on line 146 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.major.pad" on line 147 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.minor.pad" on line 148 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.color" on line 149 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.labelsize" on line 150 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "/usr/lib/python2.4/site-packages/pylab.py", line 1, in ?
> from matplotlib.pylab import *
> File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line 194, 
> in ?
> import cm
> File "/usr/lib/python2.4/site-packages/matplotlib/cm.py", line 5, in ?
> import colors
> File "/usr/lib/python2.4/site-packages/matplotlib/colors.py", line 33, 
> in ?
> from numerix import array, arange, take, put, Float, Int, where, \
> File 
> "/usr/lib/python2.4/site-packages/matplotlib/numerix/__init__.py", line 
> 62, in ?
> from Matrix import Matrix
> ImportError: No module named Matrix
> >>>
> 
> This happens with Numeric specified in my matplotlibrc. If I specify 
> numarray, I get a different import error:
> 
> andrew@idioteque:~/.matplotlib$ python
> Python 2.4.2 (#2, Sep 30 2005, 22:23:39)
> [GCC 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu8)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import pylab
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "lines.data_clipping" on line 55 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.major.size" on line 145 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.minor.size" on line 146 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.major.pad" on line 147 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.minor.pad" on line 148 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.color" on line 149 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> /usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
> UserWarning: Bad key "tick.labelsize" on line 150 in 
> /home/andrew/.matplotlib/matplotlibrc
> warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "/usr/lib/python2.4/site-packages/pylab.py", line 1, in ?
> from matplotlib.pylab import *
> File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line 194, 
> in ?
> import cm
> File "/usr/lib/python2.4/site-packages/matplotlib/cm.py", line 5, in ?
> import colors
> File "/usr/lib/python2.4/site-packages/matplotlib/colors.py", line 33, 
> in ?
> from numerix import array, arange, take, put, Float, Int, where, \
> File 
> "/usr/lib/python2.4/site-packages/matplotlib/numerix/__init__.py", line 
> 53, in ?
> from numarray.convolve import cross_correlate, convolve
> ImportError: No module named convolve
> >>>
> 
> 
> So, I suspect something is wrong in Numerix, but I have no idea what, or 
> more importantly how to fix it. Could anyone help? It would be much 
> appreciated.
> 
> Please cc me; I am not subscrived to the list.
> 
> Thanks in advance,
> Andrew Stout
> 

Hi--
I'm trying to get matplotlib installed on my laptop before my holiday 
travels begin. I've acquired all the dependencies through synaptic and 
built matplotlib from source, but when I attempt to import pylab I get 
the following error:
andrew@idioteque:~/.matplotlib$ python
Python 2.4.2 (#2, Sep 30 2005, 22:23:39)
[GCC 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu8)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import pylab
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "lines.data_clipping" on line 55 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.major.size" on line 145 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.minor.size" on line 146 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.major.pad" on line 147 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.minor.pad" on line 148 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.color" on line 149 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.labelsize" on line 150 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
 File "/usr/lib/python2.4/site-packages/pylab.py", line 1, in ?
 from matplotlib.pylab import *
 File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line 
194, in ?
 import cm
 File "/usr/lib/python2.4/site-packages/matplotlib/cm.py", line 5, in ?
 import colors
 File "/usr/lib/python2.4/site-packages/matplotlib/colors.py", line 
33, in ?
 from numerix import array, arange, take, put, Float, Int, where, \
 File 
"/usr/lib/python2.4/site-packages/matplotlib/numerix/__init__.py", line 
62, in ?
 from Matrix import Matrix
ImportError: No module named Matrix
 >>>
This happens with Numeric specified in my matplotlibrc. If I specify 
numarray, I get a different import error:
andrew@idioteque:~/.matplotlib$ python
Python 2.4.2 (#2, Sep 30 2005, 22:23:39)
[GCC 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu8)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import pylab
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "lines.data_clipping" on line 55 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.major.size" on line 145 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.minor.size" on line 146 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.major.pad" on line 147 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.minor.pad" on line 148 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.color" on line 149 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
/usr/lib/python2.4/site-packages/matplotlib/__init__.py:843: 
UserWarning: Bad key "tick.labelsize" on line 150 in 
/home/andrew/.matplotlib/matplotlibrc
 warnings.warn('Bad key "%s" on line %d in %s' % (key, cnt, fname))
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
 File "/usr/lib/python2.4/site-packages/pylab.py", line 1, in ?
 from matplotlib.pylab import *
 File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line 
194, in ?
 import cm
 File "/usr/lib/python2.4/site-packages/matplotlib/cm.py", line 5, in ?
 import colors
 File "/usr/lib/python2.4/site-packages/matplotlib/colors.py", line 
33, in ?
 from numerix import array, arange, take, put, Float, Int, where, \
 File 
"/usr/lib/python2.4/site-packages/matplotlib/numerix/__init__.py", line 
53, in ?
 from numarray.convolve import cross_correlate, convolve
ImportError: No module named convolve
 >>>
So, I suspect something is wrong in Numerix, but I have no idea what, or 
more importantly how to fix it. Could anyone help? It would be much 
appreciated.
Please cc me; I am not subscrived to the list.
Thanks in advance,
Andrew Stout