matplotlib-users Mailing List for matplotlib

Hi,

mpl does not build the wxagg bridge starting from wxPython 2.8, thanks to an
upgraded system. So you can use wx directly without (much ?) loss of speed.

Matthieu

2007/11/10, Jeff Peery <jef...@ya...>:
>
> Hello,
>   I've been using wxpython 2.6 unicode version and I recently upgraded
> to 2.8 unicode version. I'm using matplotlib 0.90.1 wxAgg in my wx app
> and when I fire it up it gives me a message that it cannot find
> 'wxmsw26uh_vc.dll'. I've had this problem before and the solution was to
> install the unicode version of wxpython. But it doesn't seem to solve the
> problem with wxpython 2.8.
>
>   how do I get rid of this error?
>   thanks!
>
>   Jeff
>
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-- 
French PhD student
Website : http://miles.developpez.com/
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On Saturday 10 November 2007 04:52:31 pm Michael McNeil Forbes wrote:
> On 10 Nov 2007, at 7:51 AM, Michael V. DePalatis wrote:
> ...
>
> > I recently discovered that if I import
> > pylab after importing numpy, I get tons of warnings:
> >
> > Warning: divide by zero encountered in divide
> > Warning: invalid value encountered in multiply
> > Warning: overflow encountered in long_scalars
> >
> > with the last occurring far most often (interestingly, I do not get
> > these warnings if pylab is imported before numpy). My question then is
> > two fold:
> >
> > (1) Why do I only get these warnings depending on when I import pylab?
>
> I am not sure: with the latest svn builds I get the message both
> ways.  Maybe the default error handling is different between the
> version of numpy and matplotlib you have installed.
>
> > (2) (a more general python question) How can I get these warning
> >     messages to give me *useful* information, such as where the
> > problems
> >     are happening?
>
> In numpy you can cause these to be exceptions by setting
>
> numpy.seterr("raise")
>
> Now you can see exactly where the exception happens.
>
> If you don't want to stop execution at this point, you use a
> callback.  This will pop-open the debugger at the point of error, but
> allow you to continue.
>
> def f(err,flag):
>      import pdb; pdb.set_trace()
>
> numpy.seterr("call")
> numpy.seterrcall(f)
>
> In general, with python warnings you can change them to exceptions by
> using warnings.simplefilter('error',Warning) (see http://
> docs.python.org/lib/module-warnings.html for details), however numpy
> does not seem to issue warnings, instead opting to directly print a
> message.  (Anyone know why the warnings library is not used?  Is this
> a bug that should be fixed?)

It would be better to discuss this on the numpy mailing list.

Darren

Hello, 
  I've been using wxpython 2.6 unicode version and I recently upgraded
 to 2.8 unicode version. I'm using matplotlib 0.90.1 wxAgg in my wx app
 and when I fire it up it gives me a message that it cannot find
 'wxmsw26uh_vc.dll'. I've had this problem before and the solution was to
 install the unicode version of wxpython. But it doesn't seem to solve the
 problem with wxpython 2.8. 
   
  how do I get rid of this error? 
  thanks!
   
  Jeff

 __________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
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On 10 Nov 2007, at 7:51 AM, Michael V. DePalatis wrote:
...

> I recently discovered that if I import
> pylab after importing numpy, I get tons of warnings:
>
> Warning: divide by zero encountered in divide
> Warning: invalid value encountered in multiply
> Warning: overflow encountered in long_scalars
>
> with the last occurring far most often (interestingly, I do not get
> these warnings if pylab is imported before numpy). My question then is
> two fold:
>
> (1) Why do I only get these warnings depending on when I import pylab?
>

I am not sure: with the latest svn builds I get the message both  
ways.  Maybe the default error handling is different between the  
version of numpy and matplotlib you have installed.


> (2) (a more general python question) How can I get these warning
>     messages to give me *useful* information, such as where the  
> problems
>     are happening?
>

In numpy you can cause these to be exceptions by setting

numpy.seterr("raise")

Now you can see exactly where the exception happens.

If you don't want to stop execution at this point, you use a  
callback.  This will pop-open the debugger at the point of error, but  
allow you to continue.

def f(err,flag):
     import pdb; pdb.set_trace()

numpy.seterr("call")
numpy.seterrcall(f)

In general, with python warnings you can change them to exceptions by  
using warnings.simplefilter('error',Warning) (see http:// 
docs.python.org/lib/module-warnings.html for details), however numpy  
does not seem to issue warnings, instead opting to directly print a  
message.  (Anyone know why the warnings library is not used?  Is this  
a bug that should be fixed?)

Michael.

On Nov 9, 2007 1:08 PM, Don Peterson <do...@gd...> wrote:

> Note: I had been using the Enthought edition of python (2.4.3 version of
> python) and matplotlib and everything worked great. I then tried to
> install the map addition to matplotlib and the installation failed. After
> that, I started getting the import error on gobject, which I assume is
> something from GTK.
>
> Does anyone have any suggestions on how to fix this? I'm pretty helpless
> right now without matplotlib, as I use it to generate graphs for a
> technical document I'm writing.

For some reason, your backend is being set to GTKAgg, though this
should not be the default on windows.  If you want to use GTK, you can
install pygtk which has a win32 installer.  But more likely, you don't
want this, so you need to find your matplotlib rc file and change the
backend bariable o TkAgg (i you ant to use TkInter) or WXAgg (if you
want to use wxpython).  If you are usin the enthought tools, you may
want to consider WxAgg since many of their tools work with wx.

The easiest  way to find your matplotlib rc file is to run a simple
script that imports pylab with the --verbose-helpful flag, eg

> python myscript.py --verbose-helpful

and it will print a line telling you the path to the matplotlib rc
file.  Change the backend line from GTKAgg to the desired backend.

JDH

Hello,

I am attempting to write a small simulation to reproduce something
from a paper. However, I'm having a whale of a time getting it to
work (as far as I have been able to tell, the calculations from the
paper at least are identical to what I am trying to do, which makes
this all the more frustrating). I recently discovered that if I import
pylab after importing numpy, I get tons of warnings:

Warning: divide by zero encountered in divide
Warning: invalid value encountered in multiply
Warning: overflow encountered in long_scalars

with the last occurring far most often (interestingly, I do not get
these warnings if pylab is imported before numpy). My question then is
two fold:

(1) Why do I only get these warnings depending on when I import pylab?

(2) (a more general python question) How can I get these warning
    messages to give me *useful* information, such as where the problems
    are happening?

Thanks,

-- 
Michael V. DePalatis
Georgia Institute of Technology
School of Physics
837 State Street
Atlanta, GA 30332-0430

em vee dee at gatech dot edu
http://mike.depalatis.net