matplotlib-users Mailing List for matplotlib (Page 10)

On Friday, August 12, 2011, WALTER Alain <ala...@th...>
wrote:
> You're right I'm not clear. You thought I' am using text() from matplotlib
but If I'm looking to the text() invocation from the module Axes3D:
>         Axes3D.text(x, y, z, s, zdir=None, **kwargs)¶
>         Add text to the plot. kwargs will be passed on to Axes.text,
except for the zdir keyword, which sets the direction to be used as the z
direction.
> In my case:
>      ax. text(23.1, 14.0, 340.0, 'ABETI', color='red')
> Anyway, now I've replaced GTK backend by GTKagg backend, and Everything
seems better.
> Alan
>

Ah, that explains everything!  Because text on an axes3d object has to be
projected to 2d, it uses simple AGG text rotation behind the scenes to
achieve that effect (rather than actually performing the expensive tedious
calculations to fully project it).  So, even though you are not rotating the
text, mplot3d is.

Good to know that switching to GTKAgg fixed everything.

Ben Root

You're right I'm not clear. You thought I' am using text() from matplotlib but If I'm looking to the text() invocation from the module Axes3D:
         Axes3D.text(x, y, z, s, zdir=None, **kwargs)¶
         Add text to the plot. kwargs will be passed on to Axes.text, except for the zdir keyword, which sets the direction to be used as the z direction.
In my case:
      ax. text(23.1, 14.0, 340.0, 'ABETI', color='red')
Anyway, now I've replaced GTK backend by GTKagg backend, and Everything seems better.
Alan

________________________________________
De : ben...@gm... [ben...@gm...] de la part de Benjamin Root [ben...@ou...]
Date d'envoi : jeudi 11 août 2011 19:54
À : WALTER Alain
Cc : mat...@li...
Objet : Re: RE : [Matplotlib-users] unable to draw text at angles other than 0 or 90

On Thu, Aug 11, 2011 at 11:21 AM, WALTER Alain <ala...@th...<mailto:ala...@th...>> wrote:
Hi Ben,
I don't want to display rotate text ! I just need to display a simple text to my figure :
       ax.text(onevolume['long'][i],onevolume['lat'][i],onevolume['upper'][i],onevolume['point'][i],color=linecolor)
In addition, I do not understand your remark about GDK, If I remember, I need to use the following modules because FigureCanvas and NavigationToolbar are required.
from matplotlib.backends.backend_gtk import FigureCanvasGTK as FigureCanvas
from matplotlib.backends.backend_gtk import NavigationToolbar2GTK as NavigationToolbar

Anyway I cannot reproduce the warning, it is a little bit strange !
Thank you


Disregard what I said earlier.  I didn't see that you were not trying to rotate your text in the first place.

What is an example value for "onevolume['point'][i]"?  The function signature for ax.text() is that the first 2 positional arguments are the coordinates, the third is the string to display (I would presume that "onevolume['upper'][i]" has something to do with the text you are displaying).  However, the "onevolume['point'][i]" is in the position for the fontdict parameter of the function call.  This dictionary overrides the default text properties, which I believe include properties like the rotation angle.

Ben Root

There are a few options you can try. And I recommend you to use gridspec module.

http://matplotlib.sourceforge.net/users/gridspec.html

It can also be used with ImageGrid (at least in the master branch, but
not sure for 1.0.1 release).

I'm attaching a sample script.

Regards,

-JJ


On Sat, Aug 6, 2011 at 12:57 AM, astabada <ast...@gm...> wrote:
>
> Hi, I am using add_subplot(...) to create a row of 4 plots, and have a tricky
> question.
> I have an image (a figure instance) composed of 4 subplots in a single row.
> I'd like to know how to arrange a number of these rows in a bigger grid,
> namely a grid of 10x3 plots, each plot made up of 1x4 subplots. The ideal
> solution would be:
> * function that returns 1x4 plots
> * call that function repeatedly
> I tried to do this with
> def function(figure, which_one, index):
>  grid = ImageGrid(figure, 10,3,index, nrows_ncols = (1, 4))
>  grid[0].imshow(something(which_one))
>  grid[1].imshow(.....)
>  ...
>
> however the plots apparently share the y axis, which for me is unfeasable
> as:
> 1) the first of 4 images has about 10000 pixels, while the others have 24
> (6x4 pixels): no chance they can be on the same scale!
> 2) I want to plot a colorbar on top of the 6x4 subplots.
> 3) I want to write labels on top of the 6x4 subplots.
>
> This is what grid produces: an ugly white space if y axes don't have the
> same length.
> http://old.nabble.com/file/p32203453/grid.png
>
> This is my best attempt, still a lot of work to do, but don't know how to
> tile several of these in a 10x3 array.
> http://old.nabble.com/file/p32203453/ifu1_1plot.png
>
> Thank you very much.
>
> Desperately,
> astabada
> --
> View this message in context: http://old.nabble.com/Subplot-of-subplots.-tp32203453p32203453.html
> Sent from the matplotlib - users mailing list archive at Nabble.com.
>
>
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>

I ended up creating a wrapper around the toolbar and resetting the labels
and redrawing whenever something changes.  Is there a cleaner way?

 

class WrappedNavigationToolbar(NavigationToolbar):

    

    def __init__(self, viewer, canvas, parent):

        self.viewer = viewer

        super(WrappedNavigationToolbar, self).__init__(canvas, parent)

        

    def release_zoom(self, event):

        print "release zoom"

        super(WrappedNavigationToolbar, self).release_zoom(event)

        self.viewer.resetLabels()

        self.draw()

                

    def release_pan(self, event):

        print "release_pan"

        super(WrappedNavigationToolbar, self).release_pan(event)

        self.viewer.resetLabels()

        self.draw()

        

    def home(self, *args):

        print "home"        

        super(WrappedNavigationToolbar, self).home(*args)

        self.viewer.resetLabels()

        self.draw()

 

    def forward(self, *args):

        print "forward"        

        super(WrappedNavigationToolbar, self).forward(*args)

        self.viewer.resetLabels()

        self.draw()

 

    def back(self, *args):

        print "back"        

        super(WrappedNavigationToolbar, self).back(*args)

        self.viewer.resetLabels()

        self.draw()

 

 

.

    def resetLabels(self):

        xlabels = self.plotInfo.getXValues()

        xticks = self.axes.get_xticks()

        newticks = []

        for label in xticks:

            idx = int(label)

            if idx >=0 and idx < len(xlabels):

                newticks.append(xlabels[idx])

            else:

                newticks.append("")

                

        self.axes.set_xticklabels(newticks)

 

From: Fiedler, Lars - 0447 - MITLL 
Sent: Thursday, August 11, 2011 6:10 PM
To: mat...@li...
Cc: Fiedler, Lars - 0447 - MITLL
Subject: How to get correct xtick labels with zooming and panning

 

Hi,

  If I create a bar graph inside a FigureCanvas, how do I get the correct x
tick labels to display when someone does a zoom with the NavigationToolbar?

 

For example, lets say I've got the below code:

        self.axes.set_xticks = range(len(vals))

        self.axes.set_xticklabels(xLabels)

        self.axes.bar(

            left=range(len(vals)), 

            height=map(float, vals), 

            width=.2, 

            align='center', 

            alpha=0.44,

            picker=5)

 

If the number of values is very large, then matplotlib seems to select only
a few x labels to display (selecting far left and right, and some in the
middle), but it's choosing the first ones in the specified label array,
instead of indexing into it.  

 

I've tried setting the tick labels, based on the ticks it's selected,
(setting labels based on the ticks after the bar has been created) and that
seems to work on the initial load, but then if someone zooms into a
particular part, it doesn't update the labels to the correct range . It's
almost like I would need a callback to reset the labels .

 

Ideas?

 

Cheers,

  Lars

 

 

Hi,

  If I create a bar graph inside a FigureCanvas, how do I get the correct x
tick labels to display when someone does a zoom with the NavigationToolbar?

 

For example, lets say I've got the below code:

        self.axes.set_xticks = range(len(vals))

        self.axes.set_xticklabels(xLabels)

        self.axes.bar(

            left=range(len(vals)), 

            height=map(float, vals), 

            width=.2, 

            align='center', 

            alpha=0.44,

            picker=5)

 

If the number of values is very large, then matplotlib seems to select only
a few x labels to display (selecting far left and right, and some in the
middle), but it's choosing the first ones in the specified label array,
instead of indexing into it.  

 

I've tried setting the tick labels, based on the ticks it's selected,
(setting labels based on the ticks after the bar has been created) and that
seems to work on the initial load, but then if someone zooms into a
particular part, it doesn't update the labels to the correct range . It's
almost like I would need a callback to reset the labels .

 

Ideas?

 

Cheers,

  Lars

 

 

Benjamin Root, on 2011-08-11 11:25,  wrote:
> On Thu, Aug 11, 2011 at 11:19 AM, David Just <Jus...@ma...> wrote:
> > --onscroll--
> >         self.ax.set_array(imdta[n]) # 0 < n < num_images
> >         self.canvas.draw()

You last line here causes every artist on the canvas to draw.

Have you tried blitting just the relevant axis? Look at the
blitting animation examples (on the site) which have moved to
examples/animation/old_animation in git.

best,
-- 
Paul Ivanov
314 address only used for lists,  off-list direct email at:
http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7 

WALTER Alain, on 2011-08-11 11:31,  wrote:
> Hello,
> It's my first post on this forum and I'm very happy to discover a forum dedicated to matplotlib. I 've begun recently a development with matplotlib inside my python (2.7)application.
> In a first step I've developped a stand alone graphical display and it runs properly. In a second step, I try to manage this graphical display through gtk (because my main application is in python/gtk) : now, most of functionalities run well, but labels on my 3 axes are no more displayed and I don't understand why.
> Thank you for all suggestions.
> 
> Here is the source code with gtk
> ...
> from matplotlib.backends.backend_gtk import FigureCanvasGTK as FigureCanvas
> ...

Hi there,

glad you found us! I haven't looked closely, but I know there are
limitations to what the gtk backend can render without using Agg
(I recall a message on this list about rotated text not working,
due to the interface to GTK we were using) so perhaps you ran
into this. 

Can you try the gtkagg backend?

best,
-- 
Paul Ivanov
314 address only used for lists,  off-list direct email at:
http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7 

On Thursday, August 11, 2011 14:20:22 you wrote:
> but i instead use the following procedure to set up all of PyLab on Ubuntu  11.04:
> 
> $ sudo add-apt-repository ppa:chris-lea/zeromq
> $ sudo add-apt-repository ppa:pyside
> $ sudo apt-get update
> $ sudo apt-get build-dep python-numpy python-scipy matplotlib ipython pyzmq
> $ sudo apt-get install python-pyside
> $ ln -s /usr/lib/python2.7/dist-packages/PySide /opt/adverplex/lib/python2.7/site-packages/

sorry, this line should be:
$ ln -s /usr/lib/python2.7/dist-packages/PySide {env}/lib/python2.7/site-packages/

where {env} is the location of your virtual environment.  my company's standard environment happens to be 
at /opt/adverplex.

> $ pip install --upgrade numpy scipy ipython pyzmq
> $ pip install 
> http://sourceforge.net/projects/matplotlib/files/matplotlib/matplotlib-1.0.1/matplotlib-1.0.1.tar.gz
> 
> this has the benefit of being compatible with any virtual environment.  prepend ``sudo `` to the pip 
> commands if your Python environment is owned by root.

On Thursday, August 11, 2011 11:29:57 Benjamin Root wrote:
> > I'm running on ubuntu 10.04 32bit, with distro package 0.99 for
> > matplotlib.  I haven't been able to find anything that helps online
> > either.
> >
> I don't remember who was hosting it, but I recall someone had a matplotlib
> v1.0.1 PPA.  I also believe that we got everything fixed for release to
> Debian (and thus Ubuntu) for the upcoming Ubuntu.  Anybody know where that
> PPA is?

you can use any one of the PPAs listed here:

https://launchpad.net/ubuntu/+ppas?name_filter=matplotlib

but i instead use the following procedure to set up all of PyLab on Ubuntu  11.04:

$ sudo add-apt-repository ppa:chris-lea/zeromq
$ sudo add-apt-repository ppa:pyside
$ sudo apt-get update
$ sudo apt-get build-dep python-numpy python-scipy matplotlib ipython pyzmq
$ sudo apt-get install python-pyside
$ ln -s /usr/lib/python2.7/dist-packages/PySide /opt/adverplex/lib/python2.7/site-packages/
$ pip install --upgrade numpy scipy ipython pyzmq
$ pip install 
http://sourceforge.net/projects/matplotlib/files/matplotlib/matplotlib-1.0.1/matplotlib-1.0.1.tar.gz

this has the benefit of being compatible with any virtual environment.  prepend ``sudo `` to the pip 
commands if your Python environment is owned by root.

On Thu, Aug 11, 2011 at 11:21 AM, WALTER Alain <ala...@th...
> wrote:

> Hi Ben,
> I don't want to display rotate text ! I just need to display a simple text
> to my figure :
>
>  ax.text(onevolume['long'][i],onevolume['lat'][i],onevolume['upper'][i],onevolume['point'][i],color=linecolor)
> In addition, I do not understand your remark about GDK, If I remember, I
> need to use the following modules because FigureCanvas and NavigationToolbar
> are required.
> from matplotlib.backends.backend_gtk import FigureCanvasGTK as FigureCanvas
> from matplotlib.backends.backend_gtk import NavigationToolbar2GTK as
> NavigationToolbar
>
> Anyway I cannot reproduce the warning, it is a little bit strange !
> Thank you
>
>
Disregard what I said earlier.  I didn't see that you were not trying to
rotate your text in the first place.

What is an example value for "onevolume['point'][i]"?  The function
signature for ax.text() is that the first 2 positional arguments are the
coordinates, the third is the string to display (I would presume that
"onevolume['upper'][i]" has something to do with the text you are
displaying).  However, the "onevolume['point'][i]" is in the position for
the fontdict parameter of the function call.  This dictionary overrides the
default text properties, which I believe include properties like the
rotation angle.

Ben Root

On Thu, Aug 11, 2011 at 11:43 AM, David Just <Jus...@ma...> wrote:

>  All the images in the pile will be the same dimensions.  What I meant was
> depending on what pile I load into the viewer,  the dimensions of that pile
> may differ eg: 150x256x10  to 512x512x150
>
>
Ok, now I understand.  Have you tried setting the interpolation to
'nearest'?  This is effectively a no-op (compared to the other
interpolators).

Ben Root

On Thu, Aug 11, 2011 at 11:34 AM, David Just <Jus...@ma...> wrote:

>  The images are usually ~ 256x256 greyscale.  They vary a bit in size, but
> are not large by any shape or form.
>
> It seems interpolation is happening on each scroll.  This is evident by
> changing the interpolation scheme from linear to spline36.
>
> Linear takes ~0.25 seconds to re-draw the new image
> spline36 takes ~.36 seconds to re-draw the new image
>
> Each “pile” of images ranges in size from 10-150 so scrolling from top to
> bottom of 150 images can take upwards of 30 seconds!!!!!!
> (This is on a macbook pro with a  2.53 ghz core 2 duo processor. )
>
> I’m also trying to figure out how to change the size of the canvas that I
> get since it’s overly large and seems to be stopping me from reducing the
> size of my GTK window.
>
> Thanks,
> Dave.
>
>
>
Are all of the images in a "pile" the same size?  If they are different
sizes as you scroll through them, then that is what is causing the problem.
I would suggest sampling all of the images to a common resolution and
scrolling through that array of images..

Ben Root

On Thu, Aug 11, 2011 at 10:46 AM, Ned <a.g...@du...> wrote:

> Hi,
> I'm trying to sort out interactive use with standard python but am having
> problems.
> If I do:
> import matplotlib
> matplotlib.use("TkAgg")
> matplotlib.interactive(True)
> import pylab
> pylab.ion()
> pylab.plot([1,2,3,4])
>
> Then I would expect a plot to appear.  But it doesn't.  I then have to
> call:
>
> pylab.draw()
>
> twice before getting the plot (the first call brings up an empty plot
> window, while the second displays the plot).
>
> Then, if I do:
> pylab.plot([1,2,3,2,3,4,5])
> again, it does nothing, until I do
> pylab.draw()
>
> Also the window isn't sensitive to expose events - if it is blocked by
> another window/minimised etc, then the contents don't reappear, just go
> blank.
>
> So, it is semi-interactive, in that I can use the python command line to
> add new lines, but I have to call draw each time (which I shouldn't have
> to), and also it doesn't redraw itself correctly.
>
> Can anyone give ideas?
>
>
The problem is mostly with the version of matplotlib you have.  Significant
effort went into interactivity for v1.0.x, and I believe your problem would
be greatly eliminated by using v1.0.1.  You are right, you shouldn't have to
call draw() all the time.


> I'm running on ubuntu 10.04 32bit, with distro package 0.99 for
> matplotlib.  I haven't been able to find anything that helps online
> either.
>
>
I don't remember who was hosting it, but I recall someone had a matplotlib
v1.0.1 PPA.  I also believe that we got everything fixed for release to
Debian (and thus Ubuntu) for the upcoming Ubuntu.  Anybody know where that
PPA is?

Ben Root

On Thu, Aug 11, 2011 at 11:19 AM, David Just <Jus...@ma...> wrote:

>  Sorry if this get’s re-posted,  my earlier e-mail didn’t seem to go
> through.
>
> I have an array of images stored as an array of numpy arrays.   I need to
> be able to efficiently scroll through that set of images.   My first attempt
> at doing this goes something like this:
>
> --init--
>
>         self.ax = pyplot.imshow(imgdta[0], interpolation='spline36',
> cmap=cm.gray, picker=True)      # draw the plot @UndefinedVariable
>         pyplot.axes().set_axis_off()
>         self.fig = self.ax.get_figure()
>         self.canvas = FigureCanvasGTKAgg(self.fig)
>
> --onscroll--
>         self.ax.set_array(imdta[n]) # 0 < n < num_images
>         self.canvas.draw()
>
>
> This method ends up re-interpolating the image on each scroll event (which
> takes SIGNIFICANT time).   What I’d like to do is pre-build the images and
> then just change what image is displayed on the canvas on each scroll event.
>  I cannot seem to figure out how to do this.  Can anybody give me a pointer
> in the right direction.
>
> Thanks,
> Dave.
>
>
You are doing it how I would do it for animations of imshow, which does not
result in re-interpolations.  I wonder if the on_scroll event is getting
called more often than it needs?  How big are these images?

Ben Root

Hi Ben,
I don't want to display rotate text ! I just need to display a simple text to my figure :
	ax.text(onevolume['long'][i],onevolume['lat'][i],onevolume['upper'][i],onevolume['point'][i],color=linecolor)		
In addition, I do not understand your remark about GDK, If I remember, I need to use the following modules because FigureCanvas and NavigationToolbar are required.
from matplotlib.backends.backend_gtk import FigureCanvasGTK as FigureCanvas
from matplotlib.backends.backend_gtk import NavigationToolbar2GTK as NavigationToolbar

Anyway I cannot reproduce the warning, it is a little bit strange !
Thank you



________________________________________
De : ben...@gm... [ben...@gm...] de la part de Benjamin Root [ben...@ou...]
Date d'envoi : jeudi 11 août 2011 16:05
À : WALTER Alain
Cc : mat...@li...
Objet : Re: [Matplotlib-users] unable to draw text at angles other than 0 or 90

On Thursday, August 11, 2011, WALTER Alain <ala...@th...<mailto:ala...@th...>> wrote:
> Hello,
> Concernig the source code of my previous post, the use of "ax.set_title('Volumic definition')" generate the following message:
> /opt/IPASTEST/lib/python2.7/site-packages/matplotlib/backends/backend_gdk.py:150: UserWarning: backend_gdk: unable to draw text at angles other than 0 or 90
>  'other than 0 or 90')
> I thought that by default the drawing requested by my instruction set_title is 0
> Thank you for your suggestions

Alain,

Only the AGG-based backends can display rotated text.  Is there a particular reason why you are using GDK backend? Since you are doing Gtk programming, I would recommend using GTKAgg.

Ben Root

Sorry if this get¹s re-posted,  my earlier e-mail didn¹t seem to go through.

I have an array of images stored as an array of numpy arrays.   I need to be
able to efficiently scroll through that set of images.   My first attempt at
doing this goes something like this:

--init--

        self.ax = pyplot.imshow(imgdta[0], interpolation='spline36',
cmap=cm.gray, picker=True)      # draw the plot @UndefinedVariable
        pyplot.axes().set_axis_off()
        self.fig = self.ax.get_figure()
        self.canvas = FigureCanvasGTKAgg(self.fig)

--onscroll--
        self.ax.set_array(imdta[n]) # 0 < n < num_images
        self.canvas.draw()


This method ends up re-interpolating the image on each scroll event (which
takes SIGNIFICANT time).   What I¹d like to do is pre-build the images and
then just change what image is displayed on the canvas on each scroll event.
I cannot seem to figure out how to do this.  Can anybody give me a pointer
in the right direction.

Thanks,
Dave.

Hi,
I'm trying to sort out interactive use with standard python but am having 
problems.
If I do:
import matplotlib
matplotlib.use("TkAgg")
matplotlib.interactive(True)
import pylab
pylab.ion()
pylab.plot([1,2,3,4])

Then I would expect a plot to appear.  But it doesn't.  I then have to call:

pylab.draw()

twice before getting the plot (the first call brings up an empty plot 
window, while the second displays the plot).

Then, if I do:
pylab.plot([1,2,3,2,3,4,5])
again, it does nothing, until I do
pylab.draw()

Also the window isn't sensitive to expose events - if it is blocked by 
another window/minimised etc, then the contents don't reappear, just go 
blank.

So, it is semi-interactive, in that I can use the python command line to 
add new lines, but I have to call draw each time (which I shouldn't have 
to), and also it doesn't redraw itself correctly.

Can anyone give ideas?

I'm running on ubuntu 10.04 32bit, with distro package 0.99 for 
matplotlib.  I haven't been able to find anything that helps online 
either.

Thanks...

>>> This is what I have:
>>> OS X Lion
>>> Fresh install of python 2.6 from macports
>>> Numpy version 1.6.1 (from macports)
>>> freetype (from macports)
>>> libpng (from macports)
>>> matplotlib 1.0.1 (from macports)
>>> 
>>> When I run my plotting script, I get the following error as soon as the script starts (i.e., right after matplotlib is imported):
>>> /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/__init__.py:403: UserWarning: matplotlibrc text.usetex can not be used with *Agg backend unless dvipng-1.5 or later is installed on your system
>>>   warnings.warn( 'matplotlibrc text.usetex can not be used with *Agg '
>>> 
>>> Note: I am using the PDF backend.
>>> 
>>> When I try to save the plot to a pdf file, I get the following error:
>>> /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py:1242: UserWarning: findfont: Font family ['serif'] not found. Falling back to Bitstream Vera Sans
>>>   (prop.get_family(), self.defaultFamily[fontext]))
>>> 
>>> This is frustrating because it's a serif font that I need.
>>> 
>>> After much thought, and Googling, I found out how to suppress the first warning message, and that is to add the directory where dvipng lives to my PATH variable. It is worth noting here that dvipng version 1.5 does not exist. The latest version is 1.14 as can be seen here: http://download.savannah.gnu.org/releases/dvipng/
> 
> 
> Actually 1.5 does exist, it's just older than 1.14 (think of it as 1.05). Are you sure that Matplotlib could "see" dvipng when it was built? During the install, it should spit out a bunch of details at the beginning with a few headings in all caps. Under the heading "OPTIONAL USETEX DEPENDENCIES", what's listed next to dvipng?
> 
> -Tony

Hey Tony,

Thanks for your suggestion. I think it fixed the problem, at least for the build from source. I haven't tried the macports version, but for anyone with the same problem that's interested, you should run

sudo port install py26-matplotlib +dvipng +latex

if you want it to build with those optional dependencies.

Damon McDougall
d.m...@wa...
http://damon.is-a-geek.com
B2.39
Mathematics Institute
Coventry
West Midlands
CV4 7AL

On Thu, Aug 11, 2011 at 9:50 AM, Damon McDougall
<D.M...@wa...>wrote:

> More diagnostics.
>

<snip>

>
> This is what I have:
> OS X Lion
> Fresh install of python 2.6 from macports
> Numpy version 1.6.1 (from macports)
> freetype (from macports)
> libpng (from macports)
> matplotlib 1.0.1 (from macports)
>
> When I run my plotting script, I get the following error as soon as the
> script starts (i.e., right after matplotlib is imported):
> /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/__init__.py:403:
> UserWarning: matplotlibrc text.usetex can not be used with *Agg backend
> unless dvipng-1.5 or later is installed on your system
>   warnings.warn( 'matplotlibrc text.usetex can not be used with *Agg '
>
> Note: I am using the PDF backend.
>
> When I try to save the plot to a pdf file, I get the following error:
> /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py:1242:
> UserWarning: findfont: Font family ['serif'] not found. Falling back to
> Bitstream Vera Sans
>   (prop.get_family(), self.defaultFamily[fontext]))
>
> This is frustrating because it's a serif font that I need.
>
> After much thought, and Googling, I found out how to suppress the first
> warning message, and that is to add the directory where dvipng lives to my
> PATH variable. It is worth noting here that dvipng version 1.5 does not
> exist. The latest version is 1.14 as can be seen here:
> http://download.savannah.gnu.org/releases/dvipng/
>
>
Actually 1.5 does exist, it's just older than 1.14 (think of it as 1.05).
Are you sure that Matplotlib could "see" dvipng when it was built? During
the install, it should spit out a bunch of details at the beginning with a
few headings in all caps. Under the heading "OPTIONAL USETEX DEPENDENCIES",
what's listed next to dvipng?

-Tony

On Thursday, August 11, 2011, WALTER Alain <ala...@th...>
wrote:
> Hello,
> Concernig the source code of my previous post, the use of
"ax.set_title('Volumic definition')" generate the following message:
>
/opt/IPASTEST/lib/python2.7/site-packages/matplotlib/backends/backend_gdk.py:150:
UserWarning: backend_gdk: unable to draw text at angles other than 0 or 90
>  'other than 0 or 90')
> I thought that by default the drawing requested by my instruction
set_title is 0
> Thank you for your suggestions

Alain,

Only the AGG-based backends can display rotated text.  Is there a particular
reason why you are using GDK backend? Since you are doing Gtk programming, I
would recommend using GTKAgg.

Ben Root

More diagnostics.

I ran the fonts_demo.py example and saved the plot as a .png (this time using the macosx backend). See attached for the result, and compare with http://matplotlib.sourceforge.net/plot_directive/mpl_examples/pylab_examples/fonts_demo.hires.png

I also got the following font warnings (in addition to the Agg warning about dvipng again) while saving the figure. This time I took out the path where dvipng lives, so that I don't get that assertion error.

/Users/damon/python/lib/matplotlib/__init__.py:401: UserWarning: matplotlibrc text.usetex can not be used with *Agg backend unless dvipng-1.5 or later is installed on your system
  warnings.warn( 'matplotlibrc text.usetex can not be used with *Agg '
/Users/damon/python/lib/matplotlib/font_manager.py:1210: UserWarning: findfont: Font family ['serif'] not found. Falling back to Bitstream Vera Sans
  (prop.get_family(), self.defaultFamily[fontext]))
/Users/damon/python/lib/matplotlib/font_manager.py:1210: UserWarning: findfont: Font family ['Script MT'] not found. Falling back to Bitstream Vera Sans
  (prop.get_family(), self.defaultFamily[fontext]))



>> Hi,
>> 
>> I am having a ridiculous amount of trouble getting Computer Modern Roman to appear in my plots. So many problems, in fact, I nuked the whole of macports and installed the things I need again because I thought it might have been a problem with using an upgraded version of macports from Snow Leopard (I'm now using Lion).
>> 
>> This is what I have:
>> OS X Lion
>> Fresh install of python 2.6 from macports
>> Numpy version 1.6.1 (from macports)
>> freetype (from macports)
>> libpng (from macports)
>> matplotlib 1.0.1 (from macports)
>> 
>> When I run my plotting script, I get the following error as soon as the script starts (i.e., right after matplotlib is imported):
>> /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/__init__.py:403: UserWarning: matplotlibrc text.usetex can not be used with *Agg backend unless dvipng-1.5 or later is installed on your system
>>   warnings.warn( 'matplotlibrc text.usetex can not be used with *Agg '
>> 
>> Note: I am using the PDF backend.
>> 
>> When I try to save the plot to a pdf file, I get the following error:
>> /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py:1242: UserWarning: findfont: Font family ['serif'] not found. Falling back to Bitstream Vera Sans
>>   (prop.get_family(), self.defaultFamily[fontext]))
>> 
>> This is frustrating because it's a serif font that I need.
>> 
>> After much thought, and Googling, I found out how to suppress the first warning message, and that is to add the directory where dvipng lives to my PATH variable. It is worth noting here that dvipng version 1.5 does not exist. The latest version is 1.14 as can be seen here: http://download.savannah.gnu.org/releases/dvipng/
>> 
> 
> Once I do this the first warning DOES disappear, and the font error disappears, but I get a new error:
>> Traceback (most recent call last):
>>   File "refinement.py", line 60, in <module>
>>     fig.savefig('conv.pdf')
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/figure.py", line 1084, in savefig
>>     self.canvas.print_figure(*args, **kwargs)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backend_bases.py", line 1923, in print_figure
>>     **kwargs)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_pdf.py", line 2156, in print_pdf
>>     self.figure.draw(renderer)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
>>     draw(artist, renderer, *args, **kwargs)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/figure.py", line 798, in draw
>>     func(*args)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
>>     draw(artist, renderer, *args, **kwargs)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axes.py", line 1946, in draw
>>     a.draw(renderer)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
>>     draw(artist, renderer, *args, **kwargs)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 1017, in draw
>>     tick.draw(renderer)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
>>     draw(artist, renderer, *args, **kwargs)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 234, in draw
>>     self.label1.draw(renderer)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
>>     draw(artist, renderer, *args, **kwargs)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/text.py", line 571, in draw
>>     self._fontproperties, angle)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_pdf.py", line 1549, in draw_tex
>>     psfont = self.tex_font_mapping(dvifont.texname)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_pdf.py", line 1365, in tex_font_mapping
>>     dviread.PsfontsMap(dviread.find_tex_file('pdftex.map'))
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/dviread.py", line 668, in __init__
>>     self._parse(file)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/dviread.py", line 701, in _parse
>>     self._register(words)
>>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/dviread.py", line 727, in _register
>>     assert encoding is None
>> AssertionError
>> 
>> I have no idea what this means or how to fix it! I assumed it was a problem with the version of dvipng that I'm using, but I'm using the latest one.
>> 
>> I have also tried grabbing the matplotlib source from git and compiling it by hand (yes, both the macports install and the source install see that I have latex installed, I also have type1cm.sty installed from texlive-latex-extra so the fonts are there. typ1cm.sty lives in /opt/local/share/texmf-texlive-dist/tex/latex/type1cm/). Maybe it's a problem with matplotlib not looking in the right place for the fonts?
>> 
>> Can anybody out there provide any suggestions?

Damon McDougall
d.m...@wa...
http://damon.is-a-geek.com
B2.39
Mathematics Institute
Coventry
West Midlands
CV4 7AL

Sorry, I made a typo. See below.

> Hi,
> 
> I am having a ridiculous amount of trouble getting Computer Modern Roman to appear in my plots. So many problems, in fact, I nuked the whole of macports and installed the things I need again because I thought it might have been a problem with using an upgraded version of macports from Snow Leopard (I'm now using Lion).
> 
> This is what I have:
> OS X Lion
> Fresh install of python 2.6 from macports
> Numpy version 1.6.1 (from macports)
> freetype (from macports)
> libpng (from macports)
> matplotlib 1.0.1 (from macports)
> 
> When I run my plotting script, I get the following error as soon as the script starts (i.e., right after matplotlib is imported):
> /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/__init__.py:403: UserWarning: matplotlibrc text.usetex can not be used with *Agg backend unless dvipng-1.5 or later is installed on your system
>   warnings.warn( 'matplotlibrc text.usetex can not be used with *Agg '
> 
> Note: I am using the PDF backend.
> 
> When I try to save the plot to a pdf file, I get the following error:
> /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py:1242: UserWarning: findfont: Font family ['serif'] not found. Falling back to Bitstream Vera Sans
>   (prop.get_family(), self.defaultFamily[fontext]))
> 
> This is frustrating because it's a serif font that I need.
> 
> After much thought, and Googling, I found out how to suppress the first warning message, and that is to add the directory where dvipng lives to my PATH variable. It is worth noting here that dvipng version 1.5 does not exist. The latest version is 1.14 as can be seen here: http://download.savannah.gnu.org/releases/dvipng/
> 

Once I do this the first warning DOES disappear, and the font error disappears, but I get a new error:
> Traceback (most recent call last):
>   File "refinement.py", line 60, in <module>
>     fig.savefig('conv.pdf')
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/figure.py", line 1084, in savefig
>     self.canvas.print_figure(*args, **kwargs)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backend_bases.py", line 1923, in print_figure
>     **kwargs)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_pdf.py", line 2156, in print_pdf
>     self.figure.draw(renderer)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/figure.py", line 798, in draw
>     func(*args)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axes.py", line 1946, in draw
>     a.draw(renderer)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 1017, in draw
>     tick.draw(renderer)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 234, in draw
>     self.label1.draw(renderer)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/text.py", line 571, in draw
>     self._fontproperties, angle)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_pdf.py", line 1549, in draw_tex
>     psfont = self.tex_font_mapping(dvifont.texname)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_pdf.py", line 1365, in tex_font_mapping
>     dviread.PsfontsMap(dviread.find_tex_file('pdftex.map'))
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/dviread.py", line 668, in __init__
>     self._parse(file)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/dviread.py", line 701, in _parse
>     self._register(words)
>   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/dviread.py", line 727, in _register
>     assert encoding is None
> AssertionError
> 
> I have no idea what this means or how to fix it! I assumed it was a problem with the version of dvipng that I'm using, but I'm using the latest one.
> 
> I have also tried grabbing the matplotlib source from git and compiling it by hand (yes, both the macports install and the source install see that I have latex installed, I also have type1cm.sty installed from texlive-latex-extra so the fonts are there. typ1cm.sty lives in /opt/local/share/texmf-texlive-dist/tex/latex/type1cm/). Maybe it's a problem with matplotlib not looking in the right place for the fonts?
> 
> Can anybody out there provide any suggestions?

Damon McDougall
d.m...@wa...
http://damon.is-a-geek.com
B2.39
Mathematics Institute
Coventry
West Midlands
CV4 7AL

Hi,

I am having a ridiculous amount of trouble getting Computer Modern Roman to appear in my plots. So many problems, in fact, I nuked the whole of macports and installed the things I need again because I thought it might have been a problem with using an upgraded version of macports from Snow Leopard (I'm now using Lion).

This is what I have:
OS X Lion
Fresh install of python 2.6 from macports
Numpy version 1.6.1 (from macports)
freetype (from macports)
libpng (from macports)
matplotlib 1.0.1 (from macports)

When I run my plotting script, I get the following error as soon as the script starts (i.e., right after matplotlib is imported):
/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/__init__.py:403: UserWarning: matplotlibrc text.usetex can not be used with *Agg backend unless dvipng-1.5 or later is installed on your system
  warnings.warn( 'matplotlibrc text.usetex can not be used with *Agg '

Note: I am using the PDF backend.

When I try to save the plot to a pdf file, I get the following error:
/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py:1242: UserWarning: findfont: Font family ['serif'] not found. Falling back to Bitstream Vera Sans
  (prop.get_family(), self.defaultFamily[fontext]))

This is frustrating because it's a serif font that I need.

After much thought, and Googling, I found out how to suppress the first warning message, and that is to add the directory where dvipng lives to my PATH variable. It is worth noting here that dvipng version 1.5 does not exist. The latest version is 1.14 as can be seen here: http://download.savannah.gnu.org/releases/dvipng/

Once I do this the first warning message does not appear, and the font error disappears but I get a new error:
Traceback (most recent call last):
  File "refinement.py", line 60, in <module>
    fig.savefig('conv.pdf')
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/figure.py", line 1084, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backend_bases.py", line 1923, in print_figure
    **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_pdf.py", line 2156, in print_pdf
    self.figure.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/figure.py", line 798, in draw
    func(*args)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axes.py", line 1946, in draw
    a.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 1017, in draw
    tick.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 234, in draw
    self.label1.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/text.py", line 571, in draw
    self._fontproperties, angle)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_pdf.py", line 1549, in draw_tex
    psfont = self.tex_font_mapping(dvifont.texname)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_pdf.py", line 1365, in tex_font_mapping
    dviread.PsfontsMap(dviread.find_tex_file('pdftex.map'))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/dviread.py", line 668, in __init__
    self._parse(file)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/dviread.py", line 701, in _parse
    self._register(words)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/dviread.py", line 727, in _register
    assert encoding is None
AssertionError

I have no idea what this means or how to fix it! I assumed it was a problem with the version of dvipng that I'm using, but I'm using the latest one.

I have also tried grabbing the matplotlib source from git and compiling it by hand (yes, both the macports install and the source install see that I have latex installed, I also have type1cm.sty installed from texlive-latex-extra so the fonts are there. typ1cm.sty lives in /opt/local/share/texmf-texlive-dist/tex/latex/type1cm/). Maybe it's a problem with matplotlib not looking in the right place for the fonts?

Can anybody out there provide any suggestions?

Damon McDougall
d.m...@wa...
http://damon.is-a-geek.com
B2.39
Mathematics Institute
Coventry
West Midlands
CV4 7AL

Hello,
Is is possible to add buttons (and relative callback) to the default toolbar that is display at the bottom of a matplotlib panel and that proposes : 
"reset original view","back to previous view", "forward to next view ..."
Any examples are welcome.
thank you

Hello,
Concernig the source code of my previous post, the use of "ax.set_title('Volumic definition')" generate the following message:
/opt/IPASTEST/lib/python2.7/site-packages/matplotlib/backends/backend_gdk.py:150: UserWarning: backend_gdk: unable to draw text at angles other than 0 or 90
  'other than 0 or 90')
I thought that by default the drawing requested by my instruction set_title is 0
Thank you for your suggestions