matplotlib-users Mailing List for matplotlib

This was fixed in CVS. See the message to this list from Steve Chaplin 
dated approx Nov 9 2004.
m.
Chris Barker wrote:
> HI all,
> 
> When I do:
> 
> from matplotlib.matlab import *
> 
> I get the following warning message:
> 
> Could not load matplotlib icon: Couldn't recognize the image file format 
> for file '/usr/share/matplotlib/matplotlib.svg'
> 
> This is really just a minor annoyance, but it's been doing this for the 
> last couple of releases. Anyone know why? why is it trying to load an svg?
> 
> Gentoo Linux Python 2.3.3, matplotlib 0.64, pygtk2.0 (I think)
> 
> -Chris
> 
> 
> 
> 

Thank you for your help. The matplotlib is now installed properly on my =
win xp computer.
I think using mingw instead of msvc was the key. That's the way it =
worked on my machine:
1.) Download and install all the required things as descibed in the =
win32_static/README but use the newest versions and for the GTK stuff =
goto =
<http://prdownloads.sourceforge.net/gladewin32/gtk-win32-devel-2.4-rc23.e=
xe?download>.
There is no need to change the "cygwinccompiler.py" but I had to adjust =
the "profile24.bat" and the "importlib24.bat".
2.) Add the following code to line 234 in the setupext.py:
 if major=3D=3D2 and minor1=3D=3D4:
 print '\tBuilding for python24'
 module.include_dirs.extend(['win32_static/include/tcl84'])
 module.library_dirs.extend(['C:/Python24/dlls']) =20
 module.libraries.extend(['tk84', 'tcl84']) =20
 el
3.) python setup.py build --compiler=3Dmingw32 bdist_wininst
Regards,
Frederik
-----Urspr=FCngliche Nachricht-----
Von: John Hunter [mailto:jdh...@ni...]=20
Gesendet: Freitag, 26. November 2004 17:59
An: Transier, Frederik
Cc: 'mat...@li...'
Betreff: Re: [Matplotlib-users] Installing matplotlib with python 2.4
>>>>> "Transier," =3D=3D Transier, Frederik <fre...@sa...> =
writes:
 Frederik> Hello, while I was trying to build the matplotlib 0.64
 Frederik> with python 2.4 on my win xp machine
 Frederik> a lot of errors occurred. Has anyone managed to install
 Frederik> it under these conditions?
 Frederik> Or is there any location I can download the binaries
 Frederik> for python 2.4 and win xp?
 Frederik> Any help would be appreciated.
Building on windows is a pain. I'll try to include a python2.4rc1
installer with the next release, possibly next week. If you need
something sooner, you'll have to post some more information to the
list. Have you read the instructions for building win32 in
setupext.py, and downloaded the win32_static file from the matplotlib
web site that is pointed to in setupext?
JDH
=20

True. Just had to check this again to make sure, but even PS3 does not support 
Alpha transparency in any way. The big improvement there was bitmapped 
masking of images, but the whole concept of true transparency really seems to 
be an extremely new idea.
Am Donnerstag, 2. Dezember 2004 13:26 schrieb John Hunter:
> >>>>> "Carol" == Carol Leger <car...@sr...> writes:
>
> Carol> The that the polar plot overlayed on a rectangular plot is
> Carol> working in Postscipt, I am having trouble with the
> Carol> semi-transparent boxes around the text.
>
> postscript doesn't support the alpha channel and there is nothing
> matplotlib can do about it. It's a postscript limitation. Right now
> the only vector output that supports alpha is SVG. Hopefully we'll
> get a PDF backend one day which also supports alpha.
>
> JDH
>
>
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-- 
_________________________________________Norbert Nemec
 Bernhardstr. 2 ... D-93053 Regensburg
 Tel: 0941 - 2009638 ... Mobil: 0179 - 7475199
 eMail: <No...@Ne...>

>>>>> "Carol" == Carol Leger <car...@sr...> writes:
 Carol> The that the polar plot overlayed on a rectangular plot is
 Carol> working in Postscipt, I am having trouble with the
 Carol> semi-transparent boxes around the text.
postscript doesn't support the alpha channel and there is nothing
matplotlib can do about it. It's a postscript limitation. Right now
the only vector output that supports alpha is SVG. Hopefully we'll
get a PDF backend one day which also supports alpha.
JDH

OK, now I understand: my problem was just the ordering of show() and savefig()
Doing savefig first and show lateron solved the problem with no further 
changes...
Thanks!
Am Donnerstag, 2. Dezember 2004 10:26 schrieb Darren Dale:
> On Thursday 02 December 2004 04:12 am, Norbert Nemec wrote:
> > Hi there,
> >
> > probably a trivial question, but somehow, I'm stuck anyway:
> >
> > I have the following script:
> >
> > ----------
> > #!/usr/bin/env python
> > import matplotlib.matlab
> > ... do some data preparation ...
> > plot(something)
> > show()
> > savefig("output.eps")
> > ----------
> >
> > If I call this script with the -dGtkAgg option, it displays the plot on
> > screen and saves an empty eps file. If I call it with -dPS, it displays
> > nothing and outputs the correct eps - so far everything as I would expect
> > it.
> >
> > Up to now, I just used the -dGtkAgg backend (as default) to get an
> > impression about the plots and then ran the script again to create the
> > .eps.
> >
> > Now, I would like the script to do both in one run: display the plot on
> > screen, and save it to disk at the same time.
> >
> > Somehow I have not achieved doing so. My first idea was to place
> > matplotlib.use('PS')
> > right before the savefig, but that does not change anything and still
> > writes an empty .eps file.
> >
> > What should I do?
>
> Hi Norbert,
>
> Try running this:
>
> ----------
> #!/usr/bin/env python
> matplotlib.use('GTKAgg')
> import matplotlib.matlab
> ... do some data preparation ...
> plot(something)
> savefig("output.eps")
> show()
> ----------
>
> That should save the file as eps and show the plot using the GTK backend.
> matplotlib.use('PS') would have to be called before importing
> matplotlib.matlab, which is why it seemed unresponsive in your script. But
> you dont need to call it for what you want to accomplish.
-- 
_________________________________________Norbert Nemec
 Bernhardstr. 2 ... D-93053 Regensburg
 Tel: 0941 - 2009638 ... Mobil: 0179 - 7475199
 eMail: <No...@Ne...>

On Thu, 2004年12月02日 at 04:49, Darren Dale wrote:
> On Wednesday 01 December 2004 07:34 pm, Stephen Walton wrote:
> > On Tue, 2004年11月30日 at 17:06 -0500, Perry Greenfield wrote:
> > > Yesterday I brought up some user interface issues with John.
> >
> > A minor point: it would be nice if in toolbar2 the currently active
> > zoom or pan tool was highlighted in some way.
depending on the backend, it already is...(see fltk for example). I
think it is not too difficult to add this for other backends...but only
the other backends developers can tell :-)
It is also available in the message area (nothing, or "pan/zoom mode",
or "zoom to rect mode" is written before the cursor coordinates). 
> Also a minor point on toolbar2, I have a suggestion for the zoom tool. If one 
> wanted to zoom in on the a region near the corner or edge of a plot, I think 
> it would be helpful if the zoom tool would remember the lower limits of the 
> axis where the pointer exits the axis. The way it works now, you have to be 
> sure to have the pointer on that last pixel inside the axis boundary when you 
> release the mouse button.
Good point, the behavior was intentional (as a way to cancel a zoom when
you started it and though afterward is was not such a good idea), but I
have also found this to be more annoying than useful, and anyway the
back button is already there ready to help you cancel any action...
I will have a look at this to change the behavior (it should check the
coordinates of the zoom rect, and adjust it to clip to current axes
limits)

On Thursday 02 December 2004 04:12 am, Norbert Nemec wrote:
> Hi there,
>
> probably a trivial question, but somehow, I'm stuck anyway:
>
> I have the following script:
>
> ----------
> #!/usr/bin/env python
> import matplotlib.matlab
> ... do some data preparation ...
> plot(something)
> show()
> savefig("output.eps")
> ----------
>
> If I call this script with the -dGtkAgg option, it displays the plot on
> screen and saves an empty eps file. If I call it with -dPS, it displays
> nothing and outputs the correct eps - so far everything as I would expect
> it.
>
> Up to now, I just used the -dGtkAgg backend (as default) to get an
> impression about the plots and then ran the script again to create the
> .eps.
>
> Now, I would like the script to do both in one run: display the plot on
> screen, and save it to disk at the same time.
>
> Somehow I have not achieved doing so. My first idea was to place
> matplotlib.use('PS')
> right before the savefig, but that does not change anything and still
> writes an empty .eps file.
>
> What should I do?
>
Hi Norbert,
Try running this:
----------
#!/usr/bin/env python
matplotlib.use('GTKAgg')
import matplotlib.matlab
... do some data preparation ...
plot(something)
savefig("output.eps")
show()
----------
That should save the file as eps and show the plot using the GTK backend. 
matplotlib.use('PS') would have to be called before importing 
matplotlib.matlab, which is why it seemed unresponsive in your script. But 
you dont need to call it for what you want to accomplish.
-- 
Darren

Hi there,
probably a trivial question, but somehow, I'm stuck anyway:
I have the following script:
----------
#!/usr/bin/env python
import matplotlib.matlab
... do some data preparation ...
plot(something)
show()
savefig("output.eps")
----------
If I call this script with the -dGtkAgg option, it displays the plot on screen 
and saves an empty eps file. If I call it with -dPS, it displays nothing and 
outputs the correct eps - so far everything as I would expect it.
Up to now, I just used the -dGtkAgg backend (as default) to get an impression 
about the plots and then ran the script again to create the .eps.
Now, I would like the script to do both in one run: display the plot on 
screen, and save it to disk at the same time.
Somehow I have not achieved doing so. My first idea was to place
 matplotlib.use('PS')
right before the savefig, but that does not change anything and still writes 
an empty .eps file.
What should I do?
Thanks,
Norbert
-- 
_________________________________________Norbert Nemec
 Bernhardstr. 2 ... D-93053 Regensburg
 Tel: 0941 - 2009638 ... Mobil: 0179 - 7475199
 eMail: <No...@Ne...>

Hi all,
 
I tried to visualize the structure of large and sparse matrices using
from matplotlib.colors import LinearSegmentedColormap
from matplotlib.matlab import *
from scipy import *
import IPython
def spy2(Z):
 """
 SPY(Z) plots the sparsity pattern of the matrix S as an image
 """
 #binary colormap min white, max black
 cmapdata = {
 'red' : ((0., 1., 1.), (1., 0., 0.)),
 'green': ((0., 1., 1.), (1., 0., 0.)),
 'blue' : ((0., 1., 1.), (1., 0., 0.))
 }
 binary = LinearSegmentedColormap('binary', cmapdata, 2)
 Z = where(Z>0,1.,0.)
 imshow(transpose(Z), interpolation='nearest', cmap=binary)
rows, cols, entries, rep, field, symm = io.mminfo('k0.mtx')
print 'number of rows, cols and entries', rows, cols, entries
print 'Start reading matrix - this may take a minute'
ma = io.mmread('k0.mtx')
print 'Finished'
flag = 1
if flag == 1:
 spy2(ma)
 show()
It failed. Is it somehow possible to visualize sparse matrices ?
Any suggestion would be appreciated.
Thanks in advance
 Nils
number of rows, cols and entries 67986 67986 4222171
Start reading matrix - this may take a minute
Finished
Traceback (most recent call last):
 File "spy.py", line 29, in ?
 spy2(ma)
 File "spy.py", line 19, in spy2
 Z = where(Z>0,1.,0.)
 File "/usr/lib/python2.3/site-packages/scipy/sparse/Sparse.py", line 145, in __cmp__
 raise TypeError, "Comparison of sparse matrices is not implemented."
TypeError: Comparison of sparse matrices is not implemented.

On Wednesday 01 December 2004 07:34 pm, Stephen Walton wrote:
> On Tue, 2004年11月30日 at 17:06 -0500, Perry Greenfield wrote:
> > Yesterday I brought up some user interface issues with John.
>
> A minor point: it would be nice if in toolbar2 the currently active
> zoom or pan tool was highlighted in some way.
Also a minor point on toolbar2, I have a suggestion for the zoom tool. If one 
wanted to zoom in on the a region near the corner or edge of a plot, I think 
it would be helpful if the zoom tool would remember the lower limits of the 
axis where the pointer exits the axis. The way it works now, you have to be 
sure to have the pointer on that last pixel inside the axis boundary when you 
release the mouse button.
-- 
Darren

John Hunter wrote:
>Plea to distutils gurus: if you can figure out a way in the current
>matplotlib setup.py setup to get a module named pylab.py into
>site-packages, please advise! The current module layout is somewhat
>complicated and already stretches my distutils capabilities.
> 
>
I wouldn't call myself a distutils guru, but is this what you mean?
#!/usr/bin/env python
from distutils.core import setup
setup(py_modules=['pylab'],
 package_dir = {'':'path/to/where/pylab.py/source/is/located'})

The that the polar plot overlayed on a rectangular plot is working in 
Postscipt, I am having trouble with the semi-transparent boxes around 
the text.
The png file looks fine, but the postcript file does not show the 
differences in the alpha value.
Since the code is short, I'll supply it here:
#!/usr/bin python
from matplotlib.matlab import *
def OverlayText(xmax):
	x=0
	y = 0.65*xmax
	ystep = 0.2*xmax
	alpha = arange(0.0,1.2,0.2)
	
	for a in alpha:
		stext = 'Alpha = %.1f' % a
		t = text(x,y,stext)
		set(t,bbox={'edgecolor':'w','facecolor':'w','alpha':a})
		y = y - ystep
if __name__ == "__main__":
	# Make some kind of plot
	xmin = -750
	xmax = 750
	ymin = xmin
	ymax = xmax
	x = [xmin,xmax,xmax,xmin]
	y = [ymin,ymin,ymax,ymax]
	fill(x,y,'g',edgecolor='b')
	a = gca()
	a.set_xlim([xmin,xmax])
	a.set_ylim([ymin,ymax])
	OverlayText(xmax)
	savefig('overlay2.png')
	savefig('overlay2.ps')
	show()
-- 
Ms. Carol A. Leger
SRI International			Phone: (650) 859-4114
333 Ravenswood Avenue G-273
Menlo Park, CA 94025 e-mail: le...@sr...

I don't know where the problem is and I know Fernando is out there
somewhere. Try the following:
In [2]: import numarray.random_array as ra
=20
In [3]: x=3Dra.random((50,50))
=20
In [4]: x.size()
Out[4]: 2500
=20
In [5]: imshow(x)
Out[5]: <matplotlib.image.AxesImage instance at 0x5658c7cc>
=20
In [6]: axis('square')
=20
After the last step you get an error dialog, but clicking OK causes the
whole session to hang. IPython and matplotlib both at version 0.64,
running on Fedora Core 2, numerix: numarray, backend: GTKAgg.
I know now that the last command is incorrect :-), but it is something a
naive MATLAB user coming to matplotlib/ipython for the first time is
likely to try.
--=20
Stephen Walton, Professor, Dept. of Physics & Astronomy, Cal State Northrid=
ge
ste...@cs...

On Tue, 2004年11月30日 at 17:06 -0500, Perry Greenfield wrote:
> Yesterday I brought up some user interface issues with John.
A minor point: it would be nice if in toolbar2 the currently active
zoom or pan tool was highlighted in some way.
--=20
Stephen Walton, Professor, Dept. of Physics & Astronomy, Cal State Northrid=
ge
ste...@cs...