matplotlib-users Mailing List for matplotlib

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hey folks,

is there any way in matplotlib to find aout the X-Y locations of
the points plotted by markers,
without using Wx-python.....

pls let me know...if there is........

pranal

>>>>> "Adam" == Adam Miller <am...@gr...> writes:

    Adam> Hi, It is correct that the machine I'm building on does not
    Adam> have X11 running, though it is installed.  I can, however,
    Adam> enter python and import gtk without error.

    Adam> [root@localhost examples]# python Python 2.4.1 (#1, May 16
    Adam> 2005, 15:15:14) [GCC 4.0.0 20050512 (Red Hat 4.0.0-5)] on
    Adam> linux2 Type "help", "copyright", "credits" or "license" for
    Adam> more information.
    >>>> import gtk
    >>>> 
    Adam> [root@localhost examples]#

Hmm... something is fish, because the error message you printed in
your first message is triggered only by an attempt to import gtk.
Look in setup.py: here is what is happening

if BUILD_GTK:
    try:
        import gtk
    except ImportError:
        print 'GTK requires pygtk'
        BUILD_GTK = 0
    except RuntimeError:
        print 'pygtk present but import failed'

I submit that something is different in your build environment in
which you triggered the original message and the one you are testing
in now.

JDH

Hi,
   It is correct that the machine I'm building on does not have X11 
running,  though it is installed.  I can, however, enter python and import 
gtk without error.

[root@localhost examples]# python
Python 2.4.1 (#1, May 16 2005, 15:15:14)
[GCC 4.0.0 20050512 (Red Hat 4.0.0-5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import gtk
>>>
[root@localhost examples]#

Adam

On Tue, 21 Nov 2006, John Hunter wrote:

>>>>>> "Adam" == Adam Miller <am...@gr...> writes:
>
>    Adam> Hi, I'm having a bit of troulbe getting pylab.show() to
>    Adam> display a figure drawn with matplotlib.
>
>    Adam> The Test:
>
>    Adam> python import pylab pylab.plot([0,0],[1,1]) pylab.show()
>
>    Adam> I do not recieve an error, though I also do not see the
>    Adam> graph.
>
>    Adam> FC4 x86_64 install
>
>    Adam> python-matplotlib-debuginfo-0.87.7-2
>    Adam> python-matplotlib-0.87.7-2
>
>    Adam> gtk2-2.6.10-2.fc4.4.i386 gtk2-2.6.10-2.fc4.4.x86_64
>    Adam> gtk2-devel-2.6.10-2.fc4.4.i386
>    Adam> gtk2-devel-2.6.10-2.fc4.4.x86_64
>
>    Adam> When I build the rpms from the srpm I see the following,
>    Adam> though the build continues.
>
>    Adam> pygtk present but import failed pygtk present but import
>    Adam> failed
>
>
> matplotlib build has this annoying problem that it requires an X11
> environment to build the GTK runtime code.  Often if you are logged in
> as su you may not have access to the X display.  You need to build in
> an environment in which you can do:
>
>> python
>>>> import gtk
>
> Then mpl should build the gtk backend properly.  What you are
> currently seeing is that the GTK build is failing which is why you are
> getting the runtime error.
>
> JDH
>

>>>>> "Adam" == Adam Miller <am...@gr...> writes:

    Adam> Hi, I'm having a bit of troulbe getting pylab.show() to
    Adam> display a figure drawn with matplotlib.

    Adam> The Test:

    Adam> python import pylab pylab.plot([0,0],[1,1]) pylab.show()

    Adam> I do not recieve an error, though I also do not see the
    Adam> graph.

    Adam> FC4 x86_64 install

    Adam> python-matplotlib-debuginfo-0.87.7-2
    Adam> python-matplotlib-0.87.7-2

    Adam> gtk2-2.6.10-2.fc4.4.i386 gtk2-2.6.10-2.fc4.4.x86_64
    Adam> gtk2-devel-2.6.10-2.fc4.4.i386
    Adam> gtk2-devel-2.6.10-2.fc4.4.x86_64

    Adam> When I build the rpms from the srpm I see the following,
    Adam> though the build continues.

    Adam> pygtk present but import failed pygtk present but import
    Adam> failed

matplotlib build has this annoying problem that it requires an X11
environment to build the GTK runtime code.  Often if you are logged in
as su you may not have access to the X display.  You need to build in
an environment in which you can do:

> python 
>>> import gtk

Then mpl should build the gtk backend properly.  What you are
currently seeing is that the GTK build is failing which is why you are
getting the runtime error.

JDH

Hi,
   I'm having a bit of troulbe getting pylab.show() to display a figure 
drawn with matplotlib.

The Test:

python
import pylab
pylab.plot([0,0],[1,1])
pylab.show()

I do not recieve an error, though I also do not see the graph.

FC4 x86_64 install

python-matplotlib-debuginfo-0.87.7-2
python-matplotlib-0.87.7-2

gtk2-2.6.10-2.fc4.4.i386
gtk2-2.6.10-2.fc4.4.x86_64
gtk2-devel-2.6.10-2.fc4.4.i386
gtk2-devel-2.6.10-2.fc4.4.x86_64

When I build the rpms from the srpm I see the following, though the build 
continues.

pygtk present but import failed
pygtk present but import failed

In /usr/src/redhat/BUILD/matplotlib-0.87.7/examples I run

'python subplot_demo.py -dGTKAgg'

and get

'ImportError: No module named _ns_backend_gdk'

Am I missing something?

Thanks!
Adam Miller

>>>>> "Eric" == Eric Firing <ef...@ha...> writes:

    Eric> Anyone who has not done such a compilation is likely to run
    Eric> into missing devel packages (because they don't get
    Eric> installed by default), but installing them using synaptic or
    Eric> apt-get should be easy, and a matter of only a few minutes.
    Eric> (It might help if we had a list of exactly which packages
    Eric> are needed--has anyone compiled this?  Any volunteers for a
    Eric> wiki entry, if there isn't one already?)

Here is the starter list which I made from a redhat distro a couple of
years ago -- much of this is probably still accurate but should be
updated by distro and wiki-ized

    *  matplotlib core: zlib, zlib-devel, libpng, libpng-devel,
         freetype, freetype-devel, freetype-utils

    * gtk/gtkagg backend: gtk2-devel, gtk+-devel, pygtk2, glib-devel,
        pygtk2-devel, gnome-libs-devel, pygtk2-libglade

    * tk backend: tcl, tk, tkinter

    * wx/wxagg backends - the wxpython rpms from wxpython

For example, I think the tcl/tk need to have some devel libs added.

JDH

Josh Lifton wrote:
> As I posted a couple of days ago, Ubuntu users have the following options
> to avoid old versions of MPL:
> 
> * Upgrade to the Edgy (6.10) distribution, which uses MPL 0.87.5.
> Upgrading is easy, see
> http://www.ubuntu.com/download/releasenotes/610?highlight=%28edgy%29%7C%28upgrade%29

(I am a happy Edgy user, but I installed from scratch.) I have read that 
the upgrade to Edgy may or may not go smoothly, however, depending on 
whether things like Automatix or EasyUbuntu were used.

> 
> * Add a repository containing the newest MPL to your
> /etc/apt/sources.list.  Such a repository was announced on this list a
> couple of days ago.

But I seem to recall that there was a problem with this--the 
dependencies did not take care of making sure that compatible versions 
of numeric libraries were installed, meaning the ones against which the 
new mpl package was compiled.

> 
> * Compile MPL from source off the SVN repository.

Or from the latest tarball, which might be slightly easier and more 
stable, but misses the very latest changes.

Anyone who has not done such a compilation is likely to run into missing 
devel packages (because they don't get installed by default), but 
installing them using synaptic or apt-get should be easy, and a matter 
of only a few minutes.  (It might help if we had a list of exactly which 
packages are needed--has anyone compiled this?  Any volunteers for a 
wiki entry, if there isn't one already?)

Anyone wanting to use wxPython will run into the long-standing 
missing-headers-bug: 
https://launchpad.net/distros/ubuntu/+source/wxwidgets2.6/+bug/2887
but it is easy to fix, as described in the link.  (There is a typo in 
step 3 of the workaround: 2.6.3.2 should be 2.6.3.3.)  Don't bother 
unless you really want wx, though.

> 
> Cheers,
> Josh

>>>>> "Samuel" == Samuel M Smith <sm...@sa...> writes:

    Samuel> I figured it out.  It is saving the outside edge as
    Samuel> transparent not gray. I was viewing the images in Apple's
    Samuel> preview and it displays transparent as gray (not
    Samuel> checkerboard like photoshop or graphic converter).

I still don't understand where the transparency is coming from (unless
you are setting the alpha explicitly somewhere else).  In the example
output I posted previously, the 4th entry in the image RGBAs is 1,
indicating that the alpha channel is 1, fully opaque.

JDH

I figured it out.  It is saving the outside edge as transparent not  
gray. I was viewing the images in Apple's preview and it
displays transparent as gray (not checkerboard like photoshop or  
graphic converter).

Sorry.

On 21 Nov, 2006, at 12:21, John Hunter wrote:

>>>>>> "Samuel" == Samuel M Smith <sm...@sa...> writes:
>
>     Samuel> I recently upgraded matplotlib 87.7 Mac OS X PPC 10.4
>     Samuel> python 2.4 from sourceforge binary Using backend TkAgg
>     Samuel> version 8.4
>
>
>     Samuel> Whenever I save png plots using the toolbar save button or
>     Samuel> explicitly, the edgecolor around the outside of the plot
>     Samuel> is gray. I want it to be white.
>
>     Samuel> I have the following in my rc file.  savefig.edgecolor :
>     Samuel> white # figure edgecolor when saving
>
>     Samuel> I also tried this in my plotting program
>     Samuel> rc('savefig',edgecolor = 'w')
>
>     Samuel> and I also tried saving from the plotting program with
>     Samuel> savefig("paths4test.png",edgecolor= 'w')
>
> Strange -- I don't see that.  In the example below, the rows of
> [1,1,1,1] indicate white. What do you get?
>
>
> In [5]: plot([1,2,3])
> Out[5]: [<matplotlib.lines.Line2D instance at 0xb64dd74c>]
>
> In [6]: savefig('test.png')
>
> In [7]: im = imread('test.png')
>
> In [8]: im.shape
> Out[8]: (900, 1200, 4)
>
>
> In [10]: im[0:5,0:10,:]
> Out[10]:
> array([[[ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.]],
>
>        [[ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.]],
>
>        [[ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.]],
>
>        [[ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.]],
>
>        [[ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.],
>         [ 1.,  1.,  1.,  1.]]], dtype=float32)
>
>

**********************************************************************
Samuel M. Smith Ph.D.
2966 Fort Hill Road
Eagle Mountain, Utah 84005-4108
801-768-2768 voice
801-768-2769 fax
**********************************************************************
"The greatest source of failure and unhappiness in the world is
giving up what we want most for what we want at the moment"
**********************************************************************

>>>>> "John" == John Hunter <jdh...@ac...> writes:

    John> Strange -- I don't see that.  In the example below, the rows
    John> of [1,1,1,1] indicate white. What do you get?

And when I ask for red, I get that too:

In [1]: plot([1,2,3])
Out[1]: [<matplotlib.lines.Line2D instance at 0xb64c7f6c>]

In [2]: savefig('test.png', edgecolor='red')

In [3]: im = imread('test.png')

In [4]: im[0:5,0:10,:]
Out[4]:
array([[[ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.        ,  0.        ,  1.        ]],

       [[ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ]],

       [[ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ]],

       [[ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ]],

       [[ 1.        ,  0.        ,  0.        ,  1.        ],
        [ 1.        ,  0.45882353,  0.45882353,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ],
        [ 1.        ,  1.        ,  1.        ,  1.        ]]],
        dtype=float32)

>>>>> "Samuel" == Samuel M Smith <sm...@sa...> writes:

    Samuel> I recently upgraded matplotlib 87.7 Mac OS X PPC 10.4
    Samuel> python 2.4 from sourceforge binary Using backend TkAgg
    Samuel> version 8.4

    Samuel> Whenever I save png plots using the toolbar save button or
    Samuel> explicitly, the edgecolor around the outside of the plot
    Samuel> is gray. I want it to be white.

    Samuel> I have the following in my rc file.  savefig.edgecolor :
    Samuel> white # figure edgecolor when saving

    Samuel> I also tried this in my plotting program
    Samuel> rc('savefig',edgecolor = 'w')

    Samuel> and I also tried saving from the plotting program with
    Samuel> savefig("paths4test.png",edgecolor= 'w')

Strange -- I don't see that.  In the example below, the rows of
[1,1,1,1] indicate white. What do you get?

In [5]: plot([1,2,3])
Out[5]: [<matplotlib.lines.Line2D instance at 0xb64dd74c>]

In [6]: savefig('test.png')

In [7]: im = imread('test.png')

In [8]: im.shape
Out[8]: (900, 1200, 4)

In [10]: im[0:5,0:10,:]
Out[10]:
array([[[ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.]],

       [[ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.]],

       [[ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.]],

       [[ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.]],

       [[ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.],
        [ 1.,  1.,  1.,  1.]]], dtype=float32)

It also doesn't work with backend WXAgg version 2.6.3.3

On 21 Nov, 2006, at 12:13, Samuel M. Smith wrote:

> I recently upgraded matplotlib 87.7 Mac OS X PPC 10.4 python 2.4 from
> sourceforge binary
> Using backend TkAgg version 8.4
>
>
> Whenever I save png plots using the toolbar save button or explicitly,
>   the edgecolor around the outside of the plot is gray. I want it to
> be white.
>
> I have the following in my rc file.
> savefig.edgecolor : white    # figure edgecolor when saving
>
> I also tried this in my plotting program
> rc('savefig',edgecolor = 'w')
>
> and I also tried saving from the plotting program with
> savefig("paths4test.png",edgecolor= 'w')
>
> Nothing seems to work.
>
> I didn't have this problem with Matplotlib 85.x
>
>
>
> **********************************************************************
> Samuel M. Smith Ph.D.
> 2966 Fort Hill Road
> Eagle Mountain, Utah 84005-4108
> 801-768-2768 voice
> 801-768-2769 fax
> **********************************************************************
> "The greatest source of failure and unhappiness in the world is
> giving up what we want most for what we want at the moment"
> **********************************************************************
>
>
>
> ---------------------------------------------------------------------- 
> ---
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**********************************************************************
Samuel M. Smith Ph.D.
2966 Fort Hill Road
Eagle Mountain, Utah 84005-4108
801-768-2768 voice
801-768-2769 fax
**********************************************************************
"The greatest source of failure and unhappiness in the world is
giving up what we want most for what we want at the moment"
**********************************************************************

As I posted a couple of days ago, Ubuntu users have the following options
to avoid old versions of MPL:

* Upgrade to the Edgy (6.10) distribution, which uses MPL 0.87.5.
Upgrading is easy, see
http://www.ubuntu.com/download/releasenotes/610?highlight=%28edgy%29%7C%28upgrade%29

* Add a repository containing the newest MPL to your
/etc/apt/sources.list.  Such a repository was announced on this list a
couple of days ago.

* Compile MPL from source off the SVN repository.

Cheers,
Josh

On Tue, 21 Nov 2006, Eric Firing wrote:

>  From my point of view, version 82-5 is simply too old to bother with.
> In newer versions quiver has been completely rewritten including masked
> array support.  I recommend that you remove your ubuntu mpl package and
> install the latest release from the source tarball.
>
>
> Eric
>
> giovanni ruggiero wrote:
> > Hi ALL,
> > I am just starting to leave the matlab to work with matplotlib 82-5 in
> > my ubuntu linux. I have problens to make a vector fild plots using
> > quiver. I have a netcdf file that i extract a u_velocity and v_velocity
> > variables, after i mask the array and try to quiver.  i get the
> > following error
> >
> > Traceback (most recent call last):
> >   File "<stdin>", line 1, in ?
> >   File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line
> > 2256, in quiver
> >     ret =  gca().quiver(*args, **kwargs)
> >   File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line 828,
> > in quiver
> >     U = asarray(U)
> >   File "/usr/lib/python2.4/site-packages/Numeric/Numeric.py", line 134,
> > in asarray
> >     return multiarray.array(a, typecode, copy=0, savespace=savespace)
> >   File "/usr/lib/python2.4/site-packages/Numeric/MA/MA.py", line 632, in
> > __array__
> >     raise MAError, \
> > MA.MA.MAError: Cannot automatically convert masked array to Numeric
> > because data
> >                    is masked in one or more locations.
> >
> >
> > But if  i do not mask the array but i try to plot without the scale it
> > gets the   error :
> >
> >  File "<stdin>", line 1, in ?
> >   File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line
> > 2256, in quiver
> >     ret =  gca().quiver(*args, **kwargs)
> >   File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line 855,
> > in quiver
> >     if Nmax == 0: #jb
> > UnboundLocalError: local variable 'Nmax' referenced before assignment
> >
> > Could someone helps me?
> > Thanks
> >
> > ------------------------------------------------------------------------
> > Novidade no Yahoo! Mail: receba alertas de novas mensagens no seu
> > celular. Registre seu aparelho agora!
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I recently upgraded matplotlib 87.7 Mac OS X PPC 10.4 python 2.4 from  
sourceforge binary
Using backend TkAgg version 8.4

Whenever I save png plots using the toolbar save button or explicitly,
  the edgecolor around the outside of the plot is gray. I want it to  
be white.

I have the following in my rc file.
savefig.edgecolor : white    # figure edgecolor when saving

I also tried this in my plotting program
rc('savefig',edgecolor = 'w')

and I also tried saving from the plotting program with
savefig("paths4test.png",edgecolor= 'w')

Nothing seems to work.

I didn't have this problem with Matplotlib 85.x

**********************************************************************
Samuel M. Smith Ph.D.
2966 Fort Hill Road
Eagle Mountain, Utah 84005-4108
801-768-2768 voice
801-768-2769 fax
**********************************************************************
"The greatest source of failure and unhappiness in the world is
giving up what we want most for what we want at the moment"
**********************************************************************

 From my point of view, version 82-5 is simply too old to bother with. 
In newer versions quiver has been completely rewritten including masked 
array support.  I recommend that you remove your ubuntu mpl package and 
install the latest release from the source tarball.

Eric

giovanni ruggiero wrote:
> Hi ALL,
> I am just starting to leave the matlab to work with matplotlib 82-5 in 
> my ubuntu linux. I have problens to make a vector fild plots using 
> quiver. I have a netcdf file that i extract a u_velocity and v_velocity 
> variables, after i mask the array and try to quiver.  i get the 
> following error
> 
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line 
> 2256, in quiver
>     ret =  gca().quiver(*args, **kwargs)
>   File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line 828, 
> in quiver
>     U = asarray(U)
>   File "/usr/lib/python2.4/site-packages/Numeric/Numeric.py", line 134, 
> in asarray
>     return multiarray.array(a, typecode, copy=0, savespace=savespace)
>   File "/usr/lib/python2.4/site-packages/Numeric/MA/MA.py", line 632, in 
> __array__
>     raise MAError, \
> MA.MA.MAError: Cannot automatically convert masked array to Numeric 
> because data
>                    is masked in one or more locations.
> 
> 
> But if  i do not mask the array but i try to plot without the scale it 
> gets the   error :
> 
>  File "<stdin>", line 1, in ?
>   File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line 
> 2256, in quiver
>     ret =  gca().quiver(*args, **kwargs)
>   File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line 855, 
> in quiver
>     if Nmax == 0: #jb
> UnboundLocalError: local variable 'Nmax' referenced before assignment
> 
> Could someone helps me?
> Thanks
> 
> ------------------------------------------------------------------------
> Novidade no Yahoo! Mail: receba alertas de novas mensagens no seu 
> celular. Registre seu aparelho agora! 
> <http://us.rd.yahoo.com/mail/br/tagline/mobile_alerts/*http://br.mobile.yahoo.com/mailalertas/>
> 
> 
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> 
> -------------------------------------------------------------------------
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> Join SourceForge.net's Techsay panel and you'll get the chance to share your
> opinions on IT & business topics through brief surveys - and earn cash
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>>>>> "Eric" == Eric Firing <ef...@ha...> writes:

    Eric> Yes, it should be !=0.  The purpose is to show how sparse a
    Eric> matrix is--how much is filled with zeros--by displaying the
    Eric> non-zero entries.

OK I fixed it.  Thanks.

JDH

Hi ALL,=0AI am just starting to leave the matlab to work with matplotlib 82=
-5 in my ubuntu linux. I have problens to make a vector fild plots using qu=
iver. I have a netcdf file that i extract a u_velocity and v_velocity varia=
bles, after i mask the array and try to quiver.  i get the following error =
=0A=0ATraceback (most recent call last):=0A  File "<stdin>", line 1, in ?=
=0A  File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line 2256=
, in quiver=0A    ret =3D  gca().quiver(*args, **kwargs)=0A  File "/usr/lib=
/python2.4/site-packages/matplotlib/axes.py", line 828, in quiver=0A    U =
=3D asarray(U)=0A  File "/usr/lib/python2.4/site-packages/Numeric/Numeric.p=
y", line 134, in asarray=0A    return multiarray.array(a, typecode, copy=3D=
0, savespace=3Dsavespace)=0A  File "/usr/lib/python2.4/site-packages/Numeri=
c/MA/MA.py", line 632, in __array__=0A    raise MAError, \=0AMA.MA.MAError:=
 Cannot automatically convert masked array to Numeric because data=0A      =
             is masked in one or more locations.=0A=0A=0ABut if  i do not m=
ask the array but i try to plot without the scale it gets the   error :=0A=
=0A File "<stdin>", line 1, in ?=0A  File "/usr/lib/python2.4/site-packages=
/matplotlib/pylab.py", line 2256, in quiver=0A    ret =3D  gca().quiver(*ar=
gs, **kwargs)=0A  File "/usr/lib/python2.4/site-packages/matplotlib/axes.py=
", line 855, in quiver=0A    if Nmax =3D=3D 0: #jb=0AUnboundLocalError: loc=
al variable 'Nmax' referenced before assignment=0A=0ACould someone helps me=
?=0AThanks=0A=0A=0A=0A=0A=09=09=0A_________________________________________=
______________ =0AYahoo! Acesso Gr=E1tis - Internet r=E1pida e gr=E1tis. In=
stale =0Ao discador agora! =0Ahttp://br.acesso.yahoo.com
John Hunter wrote:
...
> I am not a spy user, though I wrote it.  I assume the test should be Z!=0?
> 
> Note spy2 (which arguably makes a nicer plot) has the same potential
> problem.  If there is consensus that it should be !=0 I am happy to
> change it.

Yes, it should be !=0.  The purpose is to show how sparse a matrix 
is--how much is filled with zeros--by displaying the non-zero entries.

Eric

I'm trying to upgrade things.  Upon doing so, I find that  pylab gives a 
warning about not finding wxmsw26uh_vc.dll

A search suggested that I need the unicode version of wx.  I installed 
that, but still get the same message.
(Thinking I accidently installed the ansi version, I downloaded and 
installed the unicode version again.)

what do you think?
-gary

>>>>> "Robert" == Robert Cimrman <cim...@nt...> writes:

    Robert> It looks like the 'spy' function ignores negative values
    Robert> (matplotlib 0.87.5).

    Robert> In [30]:spy( ones( (5, 5) ) )[0].get_xdata() Out[30]:
    Robert> array([ 0.5, 0.5, 0.5, 0.5, 0.5, 1.5, 1.5, 1.5, 1.5, 1.5,
    Robert> 2.5, 2.5, 2.5, 2.5, 2.5, 3.5, 3.5, 3.5, 3.5, 3.5, 4.5,
    Robert> 4.5, 4.5, 4.5, 4.5])

    Robert> In [31]:spy( -ones( (5, 5) ) )[0].get_xdata()
    Robert> Out[31]:array([], type=Float)

The implementation of spy is pretty simple:

    def spy(self, Z,  marker='s', markersize=10, **kwargs):
        """
        SPY(Z, **kwargs) plots the sparsity pattern of the matrix Z
        using plot markers.

        The line handles are returned

        kwargs control the Line2D properties of the markers:
%(Line2D)s        
        """
        if hasattr(Z, 'tocoo'):
            c = Z.tocoo()
            x = c.row
            y = c.col
            z = c.data
        else:
            x,y,z = matplotlib.mlab.get_xyz_where(Z, Z>0)
        return self.plot(x+0.5,y+0.5, linestyle='None',
                         marker=marker,markersize=markersize, **kwargs)

I am not a spy user, though I wrote it.  I assume the test should be Z!=0?

Note spy2 (which arguably makes a nicer plot) has the same potential
problem.  If there is consensus that it should be !=0 I am happy to
change it.

JDH

It looks like the 'spy' function ignores negative values (matplotlib
0.87.5).

In [30]:spy( ones( (5, 5) ) )[0].get_xdata()
Out[30]:
array([ 0.5,  0.5,  0.5,  0.5,  0.5,  1.5,  1.5,  1.5,  1.5,  1.5,
        2.5,  2.5,  2.5,  2.5,  2.5,  3.5,  3.5,  3.5,  3.5,  3.5,
        4.5,  4.5,  4.5,  4.5,  4.5])

In [31]:spy( -ones( (5, 5) ) )[0].get_xdata()
Out[31]:array([], type=Float)

regards,
r.

>>>>> "Simson" == Simson Garfinkel <si...@ac...> writes:

    Simson> Well, I manually installed pytz and got this error: File
    Simson> "make_stats.py", line 184, in ?  do_plot(hosts['ec2'])
    Simson> File "make_stats.py", line 80, in do_plot from
    Simson> matplotlib.dates import MonthLocator, WeekdayLocator,
    Simson> DateFormatter File
    Simson> "/Library/Frameworks/Python.framework/Versions/2.4/lib/
    Simson> python2.4/site-packages/matplotlib/dates.py", line 92, in
    Simson> ?  from dateutil.rrule import rrule, MO, TU, WE, TH, FR,
    Simson> SA, SU, YEARLY, \ ImportError: No module named
    Simson> dateutil.rrule

    Simson> So I did a fresh install of matplotlib from darwinports
    Simson> (port install py-matplotlib) and now I'm getting the SAME
    Simson> ERROR...

When you install matplotlib from src, it automatically installs pytz
and dateutil if they are not already on your system.  The darwinports
build may be broken.  Try grabbing datetuil yourself and installing it
-- it's pure python so it should be easy.

http://labix.org/python-dateutil

JDH

>>>>> "Willi" == Willi Richert <w.r...@gm...> writes:

    Willi> Thanks, that solved that problem, but if I use
    Willi> 'label="blabla"' in scatter, it does not show up in the
    Willi> legend. Only the label of the Polygon is shown.

There was a bug in the axes autolegend code that was preventing
scatter from being picked up but I have fixed it in svn.  Note that
automatically making a legend entry with scatter is a bit problematic,
since scatter can use many different colors.  We have a poor-man's
compromise, which is to make a rectangle the sample color as the first
scatter point plotted.

JDH

Well, I manually installed pytz and got this error:

   File "make_stats.py", line 184, in ?
     do_plot(hosts['ec2'])
   File "make_stats.py", line 80, in do_plot
     from matplotlib.dates import MonthLocator, WeekdayLocator,  
DateFormatter
   File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib/dates.py", line 92, in ?
     from dateutil.rrule import rrule, MO, TU, WE, TH, FR, SA, SU,  
YEARLY, \
ImportError: No module named dateutil.rrule

So I did a fresh install of matplotlib from darwinports (port install  
py-matplotlib) and now I'm getting the SAME ERROR...

Any thoughts?

On Nov 20, 2006, at 7:36 PM, Simson Garfinkel wrote:

> I'm using matplotlib on a Mac. I tried to do a date plot but got an  
> error message that pytz is not installed. According to the "using  
> matplotlib" tutorial pytz it is supposed to be installed  
> automatically...
>
> Traceback (most recent call last):
>   File "make_stats.py", line 184, in ?
>     do_plot(hosts['ec2'])
>   File "make_stats.py", line 80, in do_plot
>     from matplotlib.dates import MonthLocator, WeekdayLocator,  
> DateFormatter
>   File "/Library/Frameworks/Python.framework/Versions/2.4/lib/ 
> python2.4/site-packages/matplotlib/dates.py", line 89, in ?
>     from pytz import timezone
> ImportError: No module named pytz
> [simsong@Black s3bandwidth] %
>
> Any  
> cue?------------------------------------------------------------------ 
> -------
> Take Surveys. Earn Cash. Influence the Future of IT
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The information about Robery Kern and MacEnthon is out of date and  
should be removed or updated. I've tried to find an updated version  
of MacEnthon on the Enthon site and haven't been able to find it...

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