matplotlib-users Mailing List for matplotlib

Hello,

I am experimenting with legends in Matplotlib 0.64 on WinXP.
I notice that when plotting at least two lines, the legend text appears 
horizontally, as expected, e.g. as in:

 >>> plot( [1,2,3], [4,5,6], [1,2,3], [-1,-3,-1] )
 >>> legend( ( 'line1', 'line2' ), 'lower right' )
 >>> show()

However, if I plot only one line, the legend appears vertically:

 >>> plot( [1,2,3], [4,5,6] )
 >>> legend( ( 'line1' ), 'lower right' )
 >>> show()

Finally,

 >>> plot( [1,2,3], [4,5,6] )
 >>> legend( ( 'line1', ), 'lower right' )
 >>> show()

(note the comma after 'line1') produces the horizontal text.

This isn't a big deal, but I am not sure where in legend.py I should fix 
that.

Thanks,
Dominique

>>>>> "Al" == Al Schapira <a.d...@wo...> writes:

    Al> Hi John, I just installed 0.64 apparently
    Al> successfully. However, none of the examples run because POLAR
    Al> cannot be imported.  I always get something like this:

    Al> [ads@ADS1 examples]$ python logo.py Traceback (most recent
    Al> call last): File "logo.py", line 3, in ?  from
    Al> matplotlib.matlab import * File
    Al> "/usr/local/lib/python2.3/site-packages/matplotlib/matlab.py",
    Al> line 162, in ?  from axes import Axes, PolarAxes File
    Al> "/usr/local/lib/python2.3/site-packages/matplotlib/axes.py",
    Al> line 9, in ?  from artist import Artist File
    Al> "/usr/local/lib/python2.3/site-packages/matplotlib/artist.py",
    Al> line 4, in ?  from transforms import identity_transform File
    Al> "/usr/local/lib/python2.3/site-packages/matplotlib/transforms.py",
    Al> line 189, in ?  from _transforms import IDENTITY, LOG10,
    Al> POLAR, Func, FuncXY ImportError: cannot import name POLAR

Please see my previous post with subject 

"if you have troubles installing"

Hi John,

I just installed 0.64 apparently successfully. However, none
of the examples run because POLAR cannot be imported.
I always get something like this:

[ads@ADS1 examples]$ python logo.py
Traceback (most recent call last):
  File "logo.py", line 3, in ?
    from matplotlib.matlab import *
  File "/usr/local/lib/python2.3/site-packages/matplotlib/matlab.py",
line 162,
in ?
    from axes import Axes, PolarAxes
  File "/usr/local/lib/python2.3/site-packages/matplotlib/axes.py", line
9, in ?    from artist import Artist
  File "/usr/local/lib/python2.3/site-packages/matplotlib/artist.py",
line 4, in ?
    from transforms import identity_transform
  File
"/usr/local/lib/python2.3/site-packages/matplotlib/transforms.py", line
189, in ?
    from _transforms import IDENTITY, LOG10, POLAR, Func, FuncXY
ImportError: cannot import name POLAR

I'm on Redhat linux 9 and have installed every version
of matplotlib since 0.50.

What gives?

Thanks.

	-Al

>>>>> "Chris" == Chris Barker <Chr...@no...> writes:

    Chris> BTW, is someone really successfully using PyGTK on Windows?
    Chris> Cool!

I've deployed pretty complex pygtk apps on windows, that incorporate
matplotlib and VTK.  Works great - my windows user have never
complained.

Of course I had to write the vtk gtkglext render window myself....

Really, though, I've been extremely happy with gtk on windows - more
so than on OSX, actually.

JDH

John Hunter wrote:
> Perhaps it would be better to define a constant in
> matplotlib.__init__.py, something like
> 
> matplotlib.PY2EXE = hasattr(sys, 'frozen')
> 
> because then the code which is conditional upon py2exe would be more
> readable
> 
>         if not matplotlib.PY2EXE
>            pygtk.require('2.0')
> 
> or something like that...

Except that Py2EXE is not the only method of "freezing" apps. In 
particular, you'd want this to work with OS-X's Py2App, and probably 
other methods of bundling apps.

you might want:

matplotlib.FROZEN = hasattr(sys, 'frozen')

and

if not matplotlib.FROZEN
    pygtk.require('2.0')

Then you could also accommodate other keywords that other bundling 
methods use.

BTW, is someone really successfully using PyGTK on Windows? Cool!

-Chris



-- 
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...

>>>>> "matthew" == matthew arnison <ma...@ca...> writes:


    matthew> 1. I had to change

      toolbar = NavigationToolbar(canvas)
    matthew> to

      toolbar = NavigationToolbar(canvas, win)

    matthew> where win is the GTK window object. I guess the
    matthew> matplotlib API is still unstable. :)

Oops.  This one slipped under my radar screen.  Sorry I didn't
announce it as an API change.  This also break
examples/embedding_in_gtk2.py, for the same reason (fixed in CVS).

Thanks for letting us know...
JDH

  Steve> I changed the code in cvs to
        import pygtk
        if not hasattr(sys, 'frozen'):
           pygtk.require('2.0')

  Steve> I think that should fix it.

Perhaps it would be better to define a constant in
matplotlib.__init__.py, something like

matplotlib.PY2EXE = hasattr(sys, 'frozen')

because then the code which is conditional upon py2exe would be more
readable

        if not matplotlib.PY2EXE
           pygtk.require('2.0')

or something like that...

JDH

On Tue, 2004-11-09 at 20:14, matthew arnison wrote:
> Thanks heaps. That made things quiet once more.
> 
> While I was in there I noticed the stanza at the top which includes:
> 
> import pygtk
> pygtk.require('2.0')
> 
> Can I suggest wrapping this with a check for py2exe? Like so:
> 
> if not hasattr(sys, 'frozen'):
>      import pygtk
>      pygtk.require('2.0')
> 
> This is because pygtk.require does not work with py2exe.
I changed the code in cvs to
import pygtk
if not hasattr(sys, 'frozen'):
    pygtk.require('2.0')

I think that should fix it.

Steve

Did I do something wrong?

After installing from the windows installer, from a DOS window:

Python 2.3.4 (#53, May 25 2004, 21:17:02) [MSC v.1200 32 bit (Intel)] on 
win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> from matplotlib.matlab import *
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
 File "C:\Python23\Lib\site-packages\matplotlib\matlab.py", line 162, in ?
   from axes import Axes, PolarAxes
 File "C:\Python23\Lib\site-packages\matplotlib\axes.py", line 9, in ?
   from artist import Artist
 File "C:\Python23\Lib\site-packages\matplotlib\artist.py", line 4, in ?
   from transforms import identity_transform
 File "C:\Python23\Lib\site-packages\matplotlib\transforms.py", line 
189, in ?
   from _transforms import IDENTITY, LOG10, POLAR, Func, FuncXY
ImportError: cannot import name POLAR
 >>>

If you have any trouble installing matplotlib, particularly if you get
error messages along the lines of 

  File "C:\Python23\Lib\site-packages\matplotlib\transforms.py", line
189, in ?
    from _transforms import IDENTITY, LOG10, POLAR, Func, FuncXY
ImportError: cannot import name POLAR
 >>>

Try removing site-packages/matplotlib and reinstalling.


JDH

Thanks heaps. That made things quiet once more.

While I was in there I noticed the stanza at the top which includes:

import pygtk
pygtk.require('2.0')

Can I suggest wrapping this with a check for py2exe? Like so:

if not hasattr(sys, 'frozen'):
     import pygtk
     pygtk.require('2.0')

This is because pygtk.require does not work with py2exe.

I guess this really a bug in pygtk. But since it is a show stopper at 
deployment time (as I discovered), I suggest it is important enough to 
provide this work around in matplotlib.

Cheers,
Matthew.

Steve Chaplin wrote:
> On Tue, 2004-11-09 at 12:24,
> mat...@li... wrote:
> 
>>Hi,
>>
>>I keep getting this error when my matplotlib gtk app starts up:
>>
>>Could not load matplotlib icon: Couldn't recognize the image file 
>>format 
>>for file 'C:\Python23\share\matplotlib\matplotlib.svg'
>>
>>I don't *think* it's my fault. It doesn't seem to do any harm but it's
>>untidy all the same.
>>
>>Any suggestions?
>>
>>Cheers,
>>Matthew.
> 
> 
> It looks like the problem is happening because your version of GTK does
> include a GDK pixbuf loader for SVG files.
> 
> You can disable the message by editing the installed backend_gtk.py
> (or editing the source file
> matplotlib\lib\matplotlib\backends\backend_gtk.py
> and reinstalling)
> and changing
> "verbose.report_error('Could not load matplotlib icon: %s' %
> sys.exc_info()[1])"
> to 
> "verbose.report('Could not load matplotlib icon: %s' %
> sys.exc_info()[1])"
> or just "pass".
> 
> The fix has also been applied to CVS.
> 
> Steve
> 

On Tue, 2004-11-09 at 12:24,
mat...@li... wrote:
> Hi,
> 
> I keep getting this error when my matplotlib gtk app starts up:
> 
> Could not load matplotlib icon: Couldn't recognize the image file 
> format 
> for file 'C:\Python23\share\matplotlib\matplotlib.svg'
> 
> I don't *think* it's my fault. It doesn't seem to do any harm but it's
> untidy all the same.
> 
> Any suggestions?
> 
> Cheers,
> Matthew.

It looks like the problem is happening because your version of GTK does
include a GDK pixbuf loader for SVG files.

You can disable the message by editing the installed backend_gtk.py
(or editing the source file
matplotlib\lib\matplotlib\backends\backend_gtk.py
and reinstalling)
and changing
"verbose.report_error('Could not load matplotlib icon: %s' %
sys.exc_info()[1])"
to 
"verbose.report('Could not load matplotlib icon: %s' %
sys.exc_info()[1])"
or just "pass".

The fix has also been applied to CVS.

Steve

Hello,

Matplotlib has been helping me a lot with my graphic needs. I am
still surprised by the looking of the pictures. Many thanks for
the great software.

I'm having some issues, though. Sometimes I get error messages,
usually an error in KERNEL32.DLL on Windows ME, and on Windows
only, I don't get this behaviour in Linux. It's not as bad as it
may seem, as every script runs completely, the pictures are saved
and, besides the message box informing the error, nothing weird
happens. I don't know how to reproduce the errors - when I run
from the DOS prompt or from IDLE, I get the messages. When I
run from my IDE (I use PSPad) I usually don't get error messages,
with the same scripts. Any hint to what I can be doing wrong, or
how to find out what is happening?

Also, I'm in need of some help. I must draw six subplots, one below
the other (subplot(6, ...)), but the way things are coming out, the
plots are to thin, and, although the picture looks good, I thought
that if I could make each subplot a little bigger, that would help
a lot. Is there any way this can be done?

In other plots, I need to index the subplots (label them '(a)',
'(b)', ... for reference in text). I was using xlabel to do that,
but when I have more than two subplots, the xlabel is shadowed by
the following subplot. Is there any way to make the space between
the plots bigger, so the xlabels can be shown, or is there any
other (better) way to do that?

Thanks in advance.

---
José Alexandre Nalon
na...@te...

Hi,

I keep getting this error when my matplotlib gtk app starts up:

Could not load matplotlib icon: Couldn't recognize the image file format 
for file 'C:\Python23\share\matplotlib\matplotlib.svg'

I don't *think* it's my fault. It doesn't seem to do any harm but it's 
untidy all the same.

Any suggestions?

Cheers,
Matthew.

Thanks for matplotlib 0.64. Great to see steady improvements continue to 
roll in.

First the good news. IPython (0.6.4) using pylab works for me again. It 
broke with 0.63 / 0.6.3 and gtk 2.4.x, complaining about gtk mainloop 
and gtk main in the middle of the IPython prompt and then freezing up.

I had some minor issues with my GTK matplotlib API code.

1. I had to change

toolbar = NavigationToolbar(canvas)

to

toolbar = NavigationToolbar(canvas, win)

where win is the GTK window object. I guess the matplotlib API is still 
unstable. :)

2. I was getting errors that the 
matplotlib.backends.backend_mod.IMAGE_FORMAT attribute was not found, 
during toolbar initialization. I put in a workaround.

works with matplotlib 0.63:

import matplotlib
matplotlib.use('GTK')

from matplotlib.backends.backend_gtk import FigureCanvasGTK
from matplotlib.backends.backend_ps import FigureCanvasPS
from matplotlib.backends.backend_gtk import NavigationToolbar2GTK as 
NavigationToolbar

using matplotlib 0.64:

import matplotlib
matplotlib.use('GTK')
from matplotlib.backends import backend_gtk
matplotlib.backends.backend_mod = backend_gtk

from matplotlib.backends.backend_gtk import FigureCanvasGTK
from matplotlib.backends.backend_ps import FigureCanvasPS
from matplotlib.backends.backend_gtk import NavigationToolbar2GTK as 
NavigationToolbar

This style was cribbed from matplotlib examples and / or emails on this 
list.

Cheers,
Matthew.