matplotlib-users Mailing List for matplotlib (Page 5)

Sun, 6 Oct 2013 15:41:07 -0500 Tony Yu <ts...@gm...>:

> The return value for streamplot is a bit hacked together. Its just a
> simple object containing a line collection and an arrow collection.
> Instead of passing the set of collections, just pass one of the
> collections to the colorbar. For example:
> 
>     sset = grid[i].streamplot(XPTS, YPTS, zx, zy, color=zr)
>     grid.cbar_axes[i].colorbar(sset.lines)
> 
> Does that work for you?

works like a charm - thank you!

best regards,
Yoshi

On Thu, Sep 26, 2013 at 10:37 AM, Yoshi Rokuko <yo...@ro...> wrote:

> Hey,
>
> I'm trying to plot streamplots into an axesgrid object with something
> like:
>
> fig = pl.figure(1, (13, 20))
> grid = AxesGrid(fig, 111,
>                 nrows_ncols = (3, 2),
>                 axes_pad = 0.6,
>                 cbar_location = 'top',
>                 cbar_mode = 'each',
>                 cbar_size = '2%',
>                 cbar_pad = '1%',
>                )
> [...]
>     norm = mpl.colors.LogNorm(vmin=1, vmax=5000)
>     im = grid[i].streamplot(XPTS, YPTS, zx, zy,
>                             color=zr,
>                             arrowsize=.001,
>                             norm=norm)
>     grid.cbar_axes[i].colorbar(im)
> [...]
>
> and then it failes with:
>
> Traceback (most recent call last):
>   File "./results.py", line 96, in <module>
>     grid.cbar_axes[i].colorbar(im)
>   File
> "/usr/lib/python2.7/site-packages/mpl_toolkits/axes_grid1/axes_grid.py",
> line 85, in colorbar cb = Colorbar(self, mappable,
> orientation=orientation, **kwargs) File
> "/usr/lib/python2.7/site-packages/mpl_toolkits/axes_grid1/colorbar.py",
> line 706, in __init__ mappable.autoscale_None() # Ensure
> mappable.norm.vmin, vmax AttributeError: 'StreamplotSet' object has no
> attribute 'autoscale_None'
>
> can't I use streamplots in axesgrid? If I comment out the colorbar for
> the streamplot colors it works ...
> Is this a bug? Is there a right way to do it? Is there a work around?
>

Hi Yoshi,

The return value for streamplot is a bit hacked together. Its just a simple
object containing a line collection and an arrow collection. Instead of
passing the set of collections, just pass one of the collections to the
colorbar. For example:

    sset = grid[i].streamplot(XPTS, YPTS, zx, zy, color=zr)
    grid.cbar_axes[i].colorbar(sset.lines)

Does that work for you?

Best,
-Tony


>
> Many thanks in advance!
>
> Regards, Yoshi

Thank you Mike, Werner and Benjamin for the good, and very fast, support.

Kind regards,
Antonio



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Hi,

On Thu, Oct 3, 2013 at 1:29 PM, Russell E. Owen <ro...@uw...> wrote:
> In article
> <CAH6Pt5q=Z_m...@ma...>,
>  Matthew Brett <mat...@gm...>
>  wrote:
>
>> Hi,
>>
>> On Thu, Oct 3, 2013 at 5:59 AM, Michael Droettboom
>> <md...@st...> wrote:
>> > Matthew Terry, as part of his Mac testing project, has done a great deal of
>> > reconnaissance on this.
>> >
>> > https://github.com/matplotlib/mpl_mac_testing
>> >
>> > I know he was looking into statically linking some of the C dependencies
>> > (freetype, libpng etc.) as a way to make the installer more robust to
>> > different environments.
>>
>> Thanks - that looks like a useful testing grid.
>>
>> Are there any near-term plans for something like a .dmg or .mpkg or
>> .pkg installer?
>
> Building a binary installer with statically linked libraries is not
> terribly hard (see
> <http://www.astro.washington.edu/users/rowen/BuildingMatplotlibForMac.htm
> l>). There are two problem:
> - As of 1.3.0 mpl does not include python-dateutil, pytz or six (for
> good reasons) and that makes it harder to make a really usable binary
> installer. This interacts with the next problem:
> - For unknown reasons running the 1.3.0 installer breaks existing
> installations of python-dateutil if those packages were installed using
> an older mpl binary installer.
>
> The missing packages can be added to the binary installer after it is
> produced by bdist_mpkg by post-processing the mpkg. That would take care
> of the second issue for most users (who would use the default
> installation and get everything). I have not had time to deal with that.
> Thus I never uploaded an official binary installer for 1.3.0 and stopped
> providing them. Matthew Terry has taken over that task.

Aha - yes - postprocessing the mpkg would be pretty easy.

So - I guess I should just build the installer myself and post it for
testing?  Is that the best way forward?

Cheers,

Matthew

In article 
<CAH6Pt5q=Z_m...@ma...>,
 Matthew Brett <mat...@gm...> 
 wrote:

> Hi,
> 
> On Thu, Oct 3, 2013 at 5:59 AM, Michael Droettboom 
> <md...@st...> wrote:
> > Matthew Terry, as part of his Mac testing project, has done a great deal of
> > reconnaissance on this.
> >
> > https://github.com/matplotlib/mpl_mac_testing
> >
> > I know he was looking into statically linking some of the C dependencies
> > (freetype, libpng etc.) as a way to make the installer more robust to
> > different environments.
> 
> Thanks - that looks like a useful testing grid.
> 
> Are there any near-term plans for something like a .dmg or .mpkg or
> .pkg installer?

Building a binary installer with statically linked libraries is not 
terribly hard (see 
<http://www.astro.washington.edu/users/rowen/BuildingMatplotlibForMac.htm
l>). There are two problem:
- As of 1.3.0 mpl does not include python-dateutil, pytz or six (for 
good reasons) and that makes it harder to make a really usable binary 
installer. This interacts with the next problem:
- For unknown reasons running the 1.3.0 installer breaks existing 
installations of python-dateutil if those packages were installed using 
an older mpl binary installer.

The missing packages can be added to the binary installer after it is 
produced by bdist_mpkg by post-processing the mpkg. That would take care 
of the second issue for most users (who would use the default 
installation and get everything). I have not had time to deal with that. 
Thus I never uploaded an official binary installer for 1.3.0 and stopped 
providing them. Matthew Terry has taken over that task.

I did put an unofficial binary installer for 1.3.0 here:
<http://www.astro.washington.edu/users/rowen/python/>
just be prepared to reinstall python-dateutil after you use it.

-- Russell

Hi,

On Thu, Oct 3, 2013 at 5:59 AM, Michael Droettboom <md...@st...> wrote:
> Matthew Terry, as part of his Mac testing project, has done a great deal of
> reconnaissance on this.
>
> https://github.com/matplotlib/mpl_mac_testing
>
> I know he was looking into statically linking some of the C dependencies
> (freetype, libpng etc.) as a way to make the installer more robust to
> different environments.

Thanks - that looks like a useful testing grid.

Are there any near-term plans for something like a .dmg or .mpkg or
.pkg installer?

Cheers,

Matthew

Hi

I am plotting a scatter plot where y axis has a log scale but in the graph
the y axis always starts from 10 to the power -1 . I tried setting the
limit with set_ylim() but i am not sure what value to give within this
method since its a log scale . Is there a way i can start y axis from 10 to
the power -0.25  .


Thanks
Dilpreet

Hi,

I would like to make Patch class (a compass) and be able to set its size in
points and its position finally interpeted in data coordinates once the
patch is added add to axes.
I tried start from a mix of existing patch classes (Patch, Polygon,
Shadow), but they all deal with transforms in a different way.

So, how to code it in a proper way ?

Thank for your help.

-- 
Stephane Raynaud

On Thu, Oct 3, 2013 at 9:22 AM, ajdcds <aj...@ho...> wrote:

> Benjamin, thank you very much for the tip!
>
> If I do
>
> import matplotlib
> matplotlib.use("TkAgg")
>
> This is only valid for the current script that is running, the matplotlibrc
> remains the same, right?
>
>
Yes, that is correct.

Benjamin, thank you very much for the tip!

If I do

import matplotlib
matplotlib.use("TkAgg")

This is only valid for the current script that is running, the matplotlibrc
remains the same, right?



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On Thu, Oct 3, 2013 at 6:35 AM, ajdcds <aj...@ho...> wrote:

> Sorry, of course it does not work, the import is incorrect!
>
> It should be
>
> import matplotlib as plt
> plt.rcParams['backend'] = 'TkAgg'
>
> or simply
> import matplotlib
> matplotlib.rcParams['backend'] = 'TkAgg'
>
>
Errr... no, don't do "import matplotlib as plt". That is just confusing.

To change backends, do the following:

import matplotlib
matplotlib.use("TkAgg")

Because backends are loaded upon import of matplotlib, changing the rcParam
after importing matplotlib is too late. You force a switch of the backend
via the "use()" function.

Matthew Terry, as part of his Mac testing project, has done a great deal 
of reconnaissance on this.

https://github.com/matplotlib/mpl_mac_testing

I know he was looking into statically linking some of the C dependencies 
(freetype, libpng etc.) as a way to make the installer more robust to 
different environments.

Mike

On 10/02/2013 04:15 PM, Matthew Brett wrote:
> Hi,
>
> Anything I can do to help get a binary installer for OSX?
>
> If I wanted to build one myself - is there a good place to start
> looking to understand the problems?
>
> Cheers,
>
> Matthew
>
> ------------------------------------------------------------------------------
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|  ||(_| |(_|(/_| |_/|(_)(/_|_ |_|_)(_)(_)| | |

http://www.droettboom.com

Sorry, of course it does not work, the import is incorrect!

It should be

import matplotlib as plt 
plt.rcParams['backend'] = 'TkAgg' 

or simply 
import matplotlib
matplotlib.rcParams['backend'] = 'TkAgg' 




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We were able to find the difference when installing Matplotlib via
Python(x,y) or as a separate package.
The difference is on paramater /backend/ on /matplotlibrc/ file.
/Python(x,y)-2.6.6.2.exe/ set the parameter to *Qt4Agg*
/matplotlib-1.0.1.win32-py2.6.exe/ sets the parameter to *TKAgg*

if backend : TKAgg
then the error
/  File
"C:\Python26\lib\site-packages\matplotlib\backends\qt4_editor\formlayout.py",
line 51, in <module>
    raise ImportError, "Warning: formlayout requires PyQt4 >v4.3"
ImportError: Warning: formlayout requires PyQt4 >v4.3/ 
Does not appear anymore.

Now looking how to use TKAgg without changing the matplotlibrc.
I've tried:

import matplotlib.pyplot as plt
plt.rcParams['backend'] = 'TkAgg'

But doesn't see to work.

Any suggestions?



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Hi,

On 03/10/2013 09:31, ajdcds wrote:
> If doing
>
> c:\Python26\python.exe file.py
>
> Then the error is on import private files, stated on my first post as
> /import <something>/
I didn't see a response from you on this:

c:\Python26\python.exe

from PyQt4.QtGui import QFormLayout

Does this give an import error?

If above does not give an import error can you try:

c:\Python26\python.exe 
folder_with_matplot_examples/user_interfaces/embedding_in_qt4.py

If this works then I am guessing that your 'file.py' does somehow 
manipulate the sys.path.

Werner

If doing

c:\Python26\python.exe file.py

Then the error is on import private files, stated on my first post as
/import <something>/



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Hi,

Anything I can do to help get a binary installer for OSX?

If I wanted to build one myself - is there a good place to start
looking to understand the problems?

Cheers,

Matthew

Hello,

I don't know what exactly happened but after upgrade my python from 2.7.3 to
2.7.5 and uninstall and install again the matplotlib using pip, the pylab
worked well... Thank you in advance for your help.




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I highly recommend macports[1] as the method to install matplotlib, as I have never had issues.

-Sterling

[1] http://www.macports.org/install.php

On Oct 2, 2013, at 7:39AM, pymilo wrote:

> Hello everyone,
> 
> I want to work whit matplotlib and I installed it using pip command.
> Apparently the installation was successful and when I open ipython and
> import matplotlib everything works well. Nevertheless when I try to import
> pyplot using: import matplotlib.pyplot I obtain this:
> 
> ---------------------------------------------------------------------------
> ImportError                               Traceback (most recent call last)
> <ipython-input-11-6f467123fe04> in <module>()
> ----> 1 import matplotlib.pyplot
> 
> /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/pyplot.py
> in <module>()
>     22 
>     23 import matplotlib
> ---> 24 import matplotlib.colorbar
>     25 from matplotlib import _pylab_helpers, interactive
>     26 from matplotlib.cbook import dedent, silent_list, is_string_like,
> is_numlike
> .
> .
> .
> /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/mathtext.py
> in <module>()
>     60 
>     61 import matplotlib.colors as mcolors
> ---> 62 import matplotlib._png as _png
>     63 ####################
>     64 
> 
> ImportError:
> dlopen(/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/_png.so,
> 2): Symbol not found: _png_set_longjmp_fn
>  Referenced from:
> /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/_png.so
>  Expected in: flat namespace
> in
> /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/_png.so
> ---------------------------------------------------------------------------
> 
> I have installed the libpng library as was suggested in other post but
> nothing worked. I am working with a Mac OS X 10.7.5 and I have installed the
> XQuartz 2.7.4. I really do not have a clue about what is happening with
> that, I would appreciate so much if you can help me figure this problem out.
> 
> 
> All the best!
> Milo.
> 
> 
> 
> 
> 
> 
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> 
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> Mat...@li...
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Hello everyone,

I have a small problem installing the latest release of matplotlib. The 
following problem occurs during building (I just used 'pip install 
matplotlib' for it):

    /opt/pkg/compiler/gnu/gcc/4.7.1/bin/g++-4.7.1 -pthread -shared
    build/temp.linux-x86_64-2.7/src/_image.o
    build/temp.linux-x86_64-2.7/src/mplutils.o
    build/temp.linux-x86_64-2.7/agg24/src/agg_bezier_arc.o
    build/temp.linux-x86_64-2.7/agg24/src/agg_curves.o
    build/temp.linux-x86_64-2.7/agg24/src/agg_image_filters.o
    build/temp.linux-x86_64-2.7/agg24/src/agg_trans_affine.o
    build/temp.linux-x86_64-2.7/agg24/src/agg_vcgen_contour.o
    build/temp.linux-x86_64-2.7/agg24/src/agg_vcgen_dash.o
    build/temp.linux-x86_64-2.7/agg24/src/agg_vcgen_stroke.o
    build/temp.linux-x86_64-2.7/agg24/src/agg_vpgen_segmentator.o
    build/temp.linux-x86_64-2.7/CXX/cxx_extensions.o
    build/temp.linux-x86_64-2.7/CXX/cxxsupport.o
    build/temp.linux-x86_64-2.7/CXX/IndirectPythonInterface.o
    build/temp.linux-x86_64-2.7/CXX/cxxextensions.o -L/usr/local/lib
    -L/usr/lib -L/usr/lib64 -lstdc++ -lm -o
    build/lib.linux-x86_64-2.7/matplotlib/_image.so

    /usr/bin/ld: /usr/lib/libm.a(s_sin.o): relocation R_X86_64_32S
    against `__sincostab' can not be used when making a shared object;
    recompile with -fPIC


I don't really understand the problem. Is it possible that the libary is 
to old or the standard libm.a isn't compiled the right way?
I'm trying to build it on a server:

    Distributor ID:    Ubuntu
    Description:    Ubuntu 12.04.2 LTS
    Release:    12.04
    Codename:    precise


Do you know a way how to avoid it and not trying to build a new libm or 
something similar?

Thank you.

Best regards,
Anton

Hi Antonio,

(forgot to copy list - for archive)

On 02/10/2013 17:05, António de Sousa wrote:
> Hi Werner,
>
> thank you for your reply.
>
> Yes, the path is C:\Python26\lib\
>
> Can it be that the error message is coming from a different location?
> Meaning that there may be duplicate files (e.g. python related 
> DLLs) in the system?
I am guessing/suspecting that you don't always run the Python version 
you think you are running.

So, just to double check, if you do:

c:\Python26\python.exe

from PyQt4.QtGui import QFormLayout

You get no error?

'file.py' is your script which runs matplotlib, yes?

if above gives no error what happens if you do:

c:\Python26\python.exe file.py

Werner

Hello everyone,

I want to work whit matplotlib and I installed it using pip command.
Apparently the installation was successful and when I open ipython and
import matplotlib everything works well. Nevertheless when I try to import
pyplot using: import matplotlib.pyplot I obtain this:

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-11-6f467123fe04> in <module>()
----> 1 import matplotlib.pyplot

/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/pyplot.py
in <module>()
     22 
     23 import matplotlib
---> 24 import matplotlib.colorbar
     25 from matplotlib import _pylab_helpers, interactive
     26 from matplotlib.cbook import dedent, silent_list, is_string_like,
is_numlike
.
.
.
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/mathtext.py
in <module>()
     60 
     61 import matplotlib.colors as mcolors
---> 62 import matplotlib._png as _png
     63 ####################
     64 

ImportError:
dlopen(/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/_png.so,
2): Symbol not found: _png_set_longjmp_fn
  Referenced from:
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/_png.so
  Expected in: flat namespace
 in
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/_png.so
---------------------------------------------------------------------------

I have installed the libpng library as was suggested in other post but
nothing worked. I am working with a Mac OS X 10.7.5 and I have installed the
XQuartz 2.7.4. I really do not have a clue about what is happening with
that, I would appreciate so much if you can help me figure this problem out.


All the best!
Milo.






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No error message:

>>> from PyQt4.QtGui import QFormLayout
>>>




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It looks like the PyQt4 installation in python(x,y) is somehow broken.  
If you just open up the python(x, y) interpreter and type

>>> from PyQt4.QtGui import QFormLayout


or

>>> from PyQt4 import QtGui


what happens?  If that fails too, I'd say the bug is in python(x, y) (or 
however PyQt4 got installled there).

Mike

On 10/02/2013 09:19 AM, ajdcds wrote:
> Hi Mike,
>
> thank you for your interest.
>
> If I replace the following statement on formlayout.py:
>
> /try:
>      from PyQt4.QtGui import QFormLayout
> except ImportError:
>      raise ImportError, "Warning: formlayout requires PyQt4 >v4.3"/
> 	
> With this one:
>
> /from PyQt4.QtGui import QFormLayout/
>
> Then the error is the following:
>
> /Traceback (most recent call last):
>    File "file.py", line 83, in <module>
>      import <something>
>    File "includes\something.py", line 31, in <module>
>      import matplotlib.pyplot as plt
>    File "C:\Python26\lib\site-packages\matplotlib\pyplot.py", line 95, in
> <module>
>      new_figure_manager, draw_if_interactive, show = pylab_setup()
>    File "C:\Python26\lib\site-packages\matplotlib\backends\__init__.py", line
> 25, in pylab_setup
>      globals(),locals(),[backend_name])
>    File
> "C:\Python26\lib\site-packages\matplotlib\backends\backend_qt4agg.py", line
> 12, in <module>
>      from backend_qt4 import QtCore, QtGui, FigureManagerQT, FigureCanvasQT,\
>    File "C:\Python26\lib\site-packages\matplotlib\backends\backend_qt4.py",
> line 18, in <module>
>      import matplotlib.backends.qt4_editor.figureoptions as figureoptions
>    File
> "C:\Python26\lib\site-packages\matplotlib\backends\qt4_editor\figureoptions.py",
> line 11, in <module>
>      import matplotlib.backends.qt4_editor.formlayout as formlayout
>    File
> "C:\Python26\lib\site-packages\matplotlib\backends\qt4_editor\formlayout.py",
> line 53, in <module>
>      from PyQt4.QtGui import QFormLayout
> ImportError: DLL load failed: The specified procedure could not be found./
>
>
>
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http://www.droettboom.com

Hi Mike,

thank you for your interest.

If I replace the following statement on formlayout.py:

/try: 
    from PyQt4.QtGui import QFormLayout 
except ImportError: 
    raise ImportError, "Warning: formlayout requires PyQt4 >v4.3"/
	
With this one:

/from PyQt4.QtGui import QFormLayout/

Then the error is the following:

/Traceback (most recent call last):
  File "file.py", line 83, in <module>
    import <something>
  File "includes\something.py", line 31, in <module>
    import matplotlib.pyplot as plt
  File "C:\Python26\lib\site-packages\matplotlib\pyplot.py", line 95, in
<module>
    new_figure_manager, draw_if_interactive, show = pylab_setup()
  File "C:\Python26\lib\site-packages\matplotlib\backends\__init__.py", line
25, in pylab_setup
    globals(),locals(),[backend_name])
  File
"C:\Python26\lib\site-packages\matplotlib\backends\backend_qt4agg.py", line
12, in <module>
    from backend_qt4 import QtCore, QtGui, FigureManagerQT, FigureCanvasQT,\
  File "C:\Python26\lib\site-packages\matplotlib\backends\backend_qt4.py",
line 18, in <module>
    import matplotlib.backends.qt4_editor.figureoptions as figureoptions
  File
"C:\Python26\lib\site-packages\matplotlib\backends\qt4_editor\figureoptions.py",
line 11, in <module>
    import matplotlib.backends.qt4_editor.formlayout as formlayout
  File
"C:\Python26\lib\site-packages\matplotlib\backends\qt4_editor\formlayout.py",
line 53, in <module>
    from PyQt4.QtGui import QFormLayout
ImportError: DLL load failed: The specified procedure could not be found./



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