matplotlib-users Mailing List for matplotlib

I've written a python gui to matplotlib which allows the user to plot either cartesian, semi-log, or log-log plots. Log plots can be generated for typical base values except for base 2. Is this a bug, or is there some reason that matplotlib does not do log plots using base 2?

I've written a python gui to matplotlib which allows the user to plot either cartesian, semi-log, or log-log plots. Log plots can be generated for typical base values except for base 2. Is this a bug, or is there some reason that matplotlib does not do log plots using base 2?

Hello,
Yes, the problem was really related to my version of matplot: i used matplot 
0.98.5.2-4.fc11 before.
I tried it with the latest svn revision (r7279) and it worked.

Thanks,
Lukas

Am Dienstag 21 Juli 2009 21:02:03 schrieb Darren Dale:
> On Tue, Jul 21, 2009 at 3:01 PM, Darren Dale<dsd...@gm...> wrote:
> > On Tue, Jul 21, 2009 at 2:47 PM, Lukas Hetzenecker<Lu...@gm...> wrote:
> >> Hello,
> >> the matplotlib widget has an incorrect default size (the left one in the
> >> attatched screenshot).
> >> I couldn't reproduce this behaviour with any Qt widget - so it seems
> >> that this is specific to matplotlib. But as I'm not really sure of the
> >> cause I posted it to both lists.
> >
> > Please keep in mind that these are both heavily subscribed lists. It
> > would be better not to burden the pyqt list with suspected matplotlib
> > problems.
> >
> > What versions of qt, pyqt and matplotlib are you using? I have
> > qt-4.5.2, PyQt-4.5.2, and an up to date matplotlib svn checkout, and I
> > don't see a problem. Maybe recent changes in svn have fixed the
> > problem, you could try downloading backend_qt4.py and
> > backend_qt4agg.py from
> > http://matplotlib.svn.sourceforge.net/viewvc/matplotlib/trunk/matplotlib/
> >lib/matplotlib/backends/ if you can't build an svn checkout.
>
> Forgot the attachment.

The height of the box will scale with the font size. If you want to
change the height independent of the font size, you need to manually
adjust the properties of the individual legend handles.

l = legend()
patches = l.get_patches() # list of legend handles whose type is
matplotlib.Patch.
for p in patches:
    p.set_height(20) # height in point. you can also adjust y
positionwith set_y method. Note that y=0 is the baseline.

Regards,

-JJ




On Tue, Jul 21, 2009 at 3:30 PM, Chuck Pepe-Ranney<cp...@mi...> wrote:
> I know that there is a keyword argument for adjusting the width of legend
> handles but how would I reduce the height of rectangle label handles?
>
> -Chuck
>
> ------------------------------------------------------------------------------
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>

I know that there is a keyword argument for adjusting the width of legend
handles but how would I reduce the *height* of rectangle label handles?

-Chuck

davide lasagna wrote:
> Hello everybody,
> this is my first post in this list. 
> 
> I'm plotting a spectrogram with
> 
> Pxx, freqs, bins, im = specgram(y, nfft=256, f_sampling=12000)
> 
> and i want to add a colorbar with
> 
> colorbar()
> 
> 
> The problem is that the color scale seems to be wrong with respect to
> the data in Pxx, i.e. Pxx is of the order of 1e-2 while in the colorbar
> i have tick values spanning from -20 to -180. What is the problem??

specgram and psd plot power in decibels: 10*log10(Pxx).

Because they involve heavy computation and application-specific choices, 
like the decibel scale, they really should not be axes methods.

You can make a function plot the spectrogram however you like by looking 
at the source code in the Axes.specgram method (the pyplot specgram 
function is just a thin wrapper for this method), which is using 
mlab.specgram to do the calculation and is then just scaling and plotting.

Eric


> 
> Thanks in advance!
> 
> 
> Davide
> 
> 
> ------------------------------------------------------------------------------
> Enter the BlackBerry Developer Challenge  
> This is your chance to win up to $100,000 in prizes! For a limited time, 
> vendors submitting new applications to BlackBerry App World(TM) will have
> the opportunity to enter the BlackBerry Developer Challenge. See full prize  
> details at: http://p.sf.net/sfu/Challenge
> _______________________________________________
> Matplotlib-users mailing list
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> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

On Tue, Jul 21, 2009 at 3:01 PM, Darren Dale<dsd...@gm...> wrote:
> On Tue, Jul 21, 2009 at 2:47 PM, Lukas Hetzenecker<Lu...@gm...> wrote:
>> Hello,
>> the matplotlib widget has an incorrect default size (the left one in the
>> attatched screenshot).
>> I couldn't reproduce this behaviour with any Qt widget - so it seems that this
>> is specific to matplotlib. But as I'm not really sure of the cause I posted it
>> to both lists.
>
> Please keep in mind that these are both heavily subscribed lists. It
> would be better not to burden the pyqt list with suspected matplotlib
> problems.
>
> What versions of qt, pyqt and matplotlib are you using? I have
> qt-4.5.2, PyQt-4.5.2, and an up to date matplotlib svn checkout, and I
> don't see a problem. Maybe recent changes in svn have fixed the
> problem, you could try downloading backend_qt4.py and
> backend_qt4agg.py from
> http://matplotlib.svn.sourceforge.net/viewvc/matplotlib/trunk/matplotlib/lib/matplotlib/backends/
> if you can't build an svn checkout.

Forgot the attachment.

On Tue, Jul 21, 2009 at 2:47 PM, Lukas Hetzenecker<Lu...@gm...> wrote:
> Hello,
> the matplotlib widget has an incorrect default size (the left one in the
> attatched screenshot).
> I couldn't reproduce this behaviour with any Qt widget - so it seems that this
> is specific to matplotlib. But as I'm not really sure of the cause I posted it
> to both lists.

Please keep in mind that these are both heavily subscribed lists. It
would be better not to burden the pyqt list with suspected matplotlib
problems.

What versions of qt, pyqt and matplotlib are you using? I have
qt-4.5.2, PyQt-4.5.2, and an up to date matplotlib svn checkout, and I
don't see a problem. Maybe recent changes in svn have fixed the
problem, you could try downloading backend_qt4.py and
backend_qt4agg.py from
http://matplotlib.svn.sourceforge.net/viewvc/matplotlib/trunk/matplotlib/lib/matplotlib/backends/
if you can't build an svn checkout.

Darren

Hello,
the matplotlib widget has an incorrect default size (the left one in the 
attatched screenshot).
I couldn't reproduce this behaviour with any Qt widget - so it seems that this 
is specific to matplotlib. But as I'm not really sure of the cause I posted it 
to both lists.

Lukas

Am Dienstag 21 Juli 2009 20:31:55 schrieb Darren Dale:
> On Tue, Jul 21, 2009 at 12:06 PM, Lukas Hetzenecker<Lu...@gm...> wrote:
> > Sorry for annoying you, but I attatched a new example to this message:
> > I've rewritten the PyQt4-example from the website to draw the Figure in a
> > tab widget. The same happens ;)
>
> In your original post, you said:
>
> "the widget in the Tab is incorrectly sized.
> If I embed the FigureCanvas in a QTabWidget the widget is to big, but if I
> put it in a QWidget it is shown correctly."
>
> Could you be more specific? What does "incorrectly sized" mean? What
> do you mean by the widget is "too big", as opposed to "shown
> correctly"? Is this really a PyQt issue, or is it specific to
> matplotlib? If the latter we should continue the discussion on the mpl
> mailing list instead of cross-posting.
>
> Darren

On Tue, Jul 21, 2009 at 12:06 PM, Lukas Hetzenecker<Lu...@gm...> wrote:
> Sorry for annoying you, but I attatched a new example to this message: I've
> rewritten the PyQt4-example from the website to draw the Figure in a tab
> widget. The same happens ;)

In your original post, you said:

"the widget in the Tab is incorrectly sized.
If I embed the FigureCanvas in a QTabWidget the widget is to big, but if I put
it in a QWidget it is shown correctly."

Could you be more specific? What does "incorrectly sized" mean? What
do you mean by the widget is "too big", as opposed to "shown
correctly"? Is this really a PyQt issue, or is it specific to
matplotlib? If the latter we should continue the discussion on the mpl
mailing list instead of cross-posting.

Darren

Robert C, Robert K, folks,

  messing with the nice delaunay/testfuncs.py to time
linear_interpolate_grid nn_interpolate_grid and nn_interpolate_unstructured
in _delaunay, I see linear ~ 100 times faster than the nn_ s:

# from: trigrid Ntri=1000 Ngrid=100  run: 21 Jul 2009 17:33  mac 10.4.11 ppc

time: 0.027 sec trigrid: build Triangulation 1000
time: 0.0059 sec trigrid 100 "linear"  corners: 0 1 2 1
time: 0.5 sec trigrid 100 "nn_grid"  corners: 0 1 2 1
time: 0.49 sec trigrid 100 "nn_unstruct"  corners: 0 1 2 1

Correct me: if all 3 methods do gridpoint-to-triangle in the same way, 
then the huge diff is in find-neighboring-triangles (6 on average ?), not in
gridpoint-to-triangle ?

This is with the _delaunay.so that comes with the mac 98.5.3 egg,
however that was compiled (-O3 ?)


What to do ?

1) does it matter, how many people care ? (all who believe in telekinesis,
raise my right hand)

2) natgrid ? don't see it in matplotlib.sf.net

3) stick with fast linear, smooth the triangle planes a la 3t^2 - 2t^3  or
fancier smoothing

In any case, add griddata( ... method = "linear" / "nn" ... ) so users have
a choice.

Can a real user or two tell us about the flow,
with some rough numbers for Ntri Ngrid Npix --
    Ntri = nr original sample points, say 1000
    Ngrid 100 x 100
    Npix 800 x 600 ?
(Ntri -> Ngrid slowly and accurately,
then Ngrid -> Npix w fast inaccurate image interpolation ? hmm.)

cheers
  -- denis

-- 
View this message in context: http://www.nabble.com/speeding-up-griddata%28%29-tp24467055p24591133.html
Sent from the matplotlib - users mailing list archive at Nabble.com.

On Tue, Jul 21, 2009 at 10:51 AM, Domenico
Nappo<dom...@gm...> wrote:
> "C:\Python25\Lib\site-packages\matplotlib\backends\backend_gtkagg.py", line
> 14, in <module>
>   from matplotlib.backends._gtkagg import agg_to_gtk_drawable
> ImportError: No module named _gtkagg
>
> I have the suspect that matplotlib windows support simply doesn't exist:)
> I'll try prepackaged windows distributions like EPD or Python(x,y) and hope
> this will solve this issue...


I'm pretty sure they do not package mpl with the gtk backend, but
Christoph Gohlke has a version that does

http://www.lfd.uci.edu/~gohlke/#pythonlibs

Hi Blaine,

let me first of all give you the reference to some documentation about the 
usage of show:
http://matplotlib.sourceforge.net/faq/howto_faq.html#use-show

Furthermore I may recommend you to replace your call of show in 'p' by a call 
of draw, which will yield the expected behaviour in ipythons pylab mode.

Hopefully these hints are helpful to you.

best regards Matthias
 
On Monday 20 July 2009 19:36:24 Blaine Booher wrote:
> hey everyone,
>   I have an interactive python application that I am using pylab with.  I
> am having a problem where I can only create a graph ONE time.  all other
> calls to plot() and show() cause nothing to happen.
>
>   I have used ipython -pylab as well, but the problem I am having with
> ipython is that all the graphs will show up AFTER i close my interactive
> shell.  Of course, ipython works interatively every time I 'plot' or 'show'
> at the ipython command line.
>
>   Is this a backend issue? Does anyone else have this problem?
>
> issue can be summarized as such:
> >>>from pylab import *
> >>>def p():
>
>   plot([1,2], [1,2])
>   show()
>
> >>>p() // works fine. graph pops up.
> >>>p() //returns nothing, no graph shows up
> >>>p() //same as above
>
> I am on Debian Lenny, pylab .98.3-5
>
> Blaine

Sorry for annoying you, but I attatched a new example to this message: I've 
rewritten the PyQt4-example from the website to draw the Figure in a tab 
widget. The same happens ;)

Am Montag 20 Juli 2009 21:58:46 schrieb Lukas Hetzenecker:
> Hm.. I added a resize() after the show():
>
> class Plot_tab(QTabWidget, tab):
>     def __init__(self):
>         super(Plot_tab, self).__init__()
>         self.setupUi(self)
>
>         self.show()
>         self.resize(self.size().width()+1, self.size().height()+1)
>         self.resize(self.size().width()-1, self.size().height()-1)
>
> if __name__ == "__main__":
>     import sys
>     app = QApplication(sys.argv)
>
>     plot_t = Plot_tab()
>
>     sys.exit(app.exec_())
>
>
> Now it works, but I really want to know why..?
> Is there a way to avoid this ugly workaround?
>
> Thanks,
> Lukas
>
> Am Sonntag 19 Juli 2009 12:58:53 schrieb Lukas Hetzenecker:
> > Hello,
> >
> > I've tried to resize the QTabWidget, I've searched for examples on the
> > internet, added a QTabWidget and used this as the Mainwindows central
> > widget - but exactly the same happened.
> >
> > It works if I replace the FigureCanvas with a Qt Widget - for example a
> > text edit or a QWebView.
> >
> > Am Sonntag 19 Juli 2009 11:54:12 schrieb projetmbc:
> > > Lukas Hetzenecker a écrit :
> > > > I tried to embed a Matplotlib FigureCanvas into a QTabWidget.
> > > > But at the first start of my script - the main.py in the attatched
> > > > example - the widget in the Tab is incorrectly sized.
> > > > If I embed the FigureCanvas in a QTabWidget the widget is to big, but
> > > > if I put it in a QWidget it is shown correctly.
> > >
> > > I'm not sure that is a pure MatPlotLib issue. Have you try with a big
> > > standard widget instead of the FigureCanvas ?
> > >
> > > Christophe
> >
> > -------------------------------------------------------------------------
> >-- --- Enter the BlackBerry Developer Challenge
> > This is your chance to win up to $100,000 in prizes! For a limited time,
> > vendors submitting new applications to BlackBerry App World(TM) will have
> > the opportunity to enter the BlackBerry Developer Challenge. See full
> > prize details at: http://p.sf.net/sfu/Challenge
> > _______________________________________________
> > Matplotlib-users mailing list
> > Mat...@li...
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
> ---------------------------------------------------------------------------
>--- Enter the BlackBerry Developer Challenge
> This is your chance to win up to $100,000 in prizes! For a limited time,
> vendors submitting new applications to BlackBerry App World(TM) will have
> the opportunity to enter the BlackBerry Developer Challenge. See full prize
> details at: http://p.sf.net/sfu/Challenge
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Hi all,
I'd like to do a histogram with barstacked style. Well, I'm not able
to make it in any way :(

- what is the format of the the data to pass?
- what's the value of bins? (related to the above question, I suppose)

for example, let's say I want to plot this series

s1 = 2,3,6,3,1
s2 = 1,2,2,4,1
s3 = 4,1,0,3,7

what's the format of data to pass to hist() ? by row? by column?

Thanks a lot in advance,
-- 
Sandro Tosi (aka morph, morpheus, matrixhasu)
My website: http://matrixhasu.altervista.org/
Me at Debian: http://wiki.debian.org/SandroTosi

Thanks for your reply, anyway.
I've tried to change the backend to GTKAgg and now when I startt ipython
-pylab I receive:
Traceback (most recent call last):
  File "C:\Python25\scripts\ipython.py", line 28, in <module>
  IPython.Shell.start().mainloop()
  File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 1233, in start
  return shell(user_ns = user_ns)
  File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 1108, in
__init__
  shell_class=MatplotlibMTShell)
  File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 793, in
__init__
  on_kill=[mainquit])
  File "C:\Python25\Lib\site-packages\IPython\ipmaker.py", line 103, in
make_IPython
  embedded=embedded,**kw)
  File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 639, in
__init__
  user_ns,user_global_ns,b2 =
self._matplotlib_config(name,user_ns,user_global_ns)
  File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 559, in
_matplotlib_config
  import matplotlib.pylab as pylab
  File "C:\Python25\Lib\site-packages\matplotlib\pylab.py", line 253, in
<module>
  from matplotlib.pyplot import *
  File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 75, in
<module>
  new_figure_manager, draw_if_interactive, show = pylab_setup()
  File "C:\Python25\Lib\site-packages\matplotlib\backends\__init__.py", line
25, in pylab_setup
  globals(),locals(),[backend_name])
  File
"C:\Python25\Lib\site-packages\matplotlib\backends\backend_gtkagg.py", line
14, in <module>
  from matplotlib.backends._gtkagg import agg_to_gtk_drawable
ImportError: No module named _gtkagg

I have the suspect that matplotlib windows support simply doesn't exist:)
I'll try prepackaged windows distributions like EPD or Python(x,y) and hope
this will solve this issue...
Thanks again.

2009/7/21 Jae-Joon Lee <lee...@gm...>

> As the warning message indicates, I think this is a backend issue.
> The recommended backend (for screen display) is the Agg family, e.g.,
> TkAgg, GTKAgg, etc.
>
> I rarely use Windows and I never used matplotlib on Windows, so there
> is not much I can help.
> I'm not sure which backend is available on Windows, but try some other
> backend.
>
> http://matplotlib.sourceforge.net/faq/installing_faq.html#what-is-a-backend
>
> Also, please check out the binary installer for windows,
>
> http://matplotlib.sourceforge.net/faq/installing_faq.html#windows-questions
>
> Regards,
>
> -JJ
>
>
> On Tue, Jul 21, 2009 at 4:01 AM, Domenico Nappo<dom...@gm...>
> wrote:
> > Hi JJ,
> > thanks for your reply.
> > Let me say first that I've some problems with installation, I think: when
> I
> > try to run ipython -pylab I got the following:
> > C:\Documents and Settings\user>ipython -pylab
> > Traceback (most recent call last):
> >   File "C:\Python25\scripts\ipython.py", line 28, in <module>
> >   IPython.Shell.start().mainloop()
> >   File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 1233, in
> start
> >   return shell(user_ns = user_ns)
> >   File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 1108, in
> > __init__
> >   shell_class=MatplotlibMTShell)
> >   File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 793, in
> > __init__
> >   on_kill=[mainquit])
> >   File "C:\Python25\Lib\site-packages\IPython\ipmaker.py", line 103, in
> > make_IPython
> >   embedded=embedded,**kw)
> >   File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 639, in
> > __init__
> >   user_ns,user_global_ns,b2 =
> > self._matplotlib_config(name,user_ns,user_global_ns)
> >   File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 559, in
> > _matplotlib_config
> >   import matplotlib.pylab as pylab
> >   File "C:\Python25\Lib\site-packages\matplotlib\pylab.py", line 253, in
> > <module>
> >   from matplotlib.pyplot import *
> >   File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 75, in
> > <module>
> >   new_figure_manager, draw_if_interactive, show = pylab_setup()
> >   File "C:\Python25\Lib\site-packages\matplotlib\backends\__init__.py",
> line
> > 25, in pylab_setup
> >   globals(),locals(),[backend_name])
> >   File
> "C:\Python25\Lib\site-packages\matplotlib\backends\backend_gtk.py",
> > line 25, in <module>
> >   from matplotlib.backends.backend_gdk import RendererGDK,
> FigureCanvasGDK
> >   File
> "C:\Python25\lib\site-packages\matplotlib\backends\backend_gdk.py",
> > line 29, in <module>
> >   from matplotlib.backends._backend_gdk import pixbuf_get_pixels_array
> > ImportError: No module named _backend_gdk
> >
> > If I comment the import statement for _backend_gdk in backend_gdk.py,
> > ipython runs well.
> > Below, the code:
> > In [20]:
> >
> X=load('E:\\user\\Applicazioni\\EFGExtractor\\dataJan03Dec08.matplotlibtest',converters={0:strpdate2num('%Y-%m-%d')})
> >
> > In [21]: time = X[:,0]
> >
> > In [22]: time
> > Out[22]: array([ 731216., 731217., 731218., ..., 733040., 733041.,
> 733042.])
> >
> > In [23]: data = X[:,1]
> >
> > In [24]: data
> > Out[24]: array([ 150., 140., 142., ..., 92., 84., 76.])
> >
> >
> > In [30]: fig = figure()
> >
> > In [31]: ax = fig.add_subplot(111)
> >
> > In [32]: ax.plot_date(time, data, '-')
> > Out[32]: [<matplotlib.lines.Line2D object at 0x0218B030>]
> >
> > In [33]: show()
> >
> > In [34]: fig.autofmt_xdate()
> >
> >
> > In [37]:
> > C:\Python25\lib\site-packages\matplotlib\backends\backend_gdk.py:148:
> > UserWarning: backend_gdk: unable to draw text at angles other than 0 or
> 90
> >   'other than 0 or 90')
> > This time I've noticed the warning above: "unable to draw text at angles
> > other than 0 or 90"
> > Thanks in advance for any clarification...
> > 2009/7/17 Jae-Joon Lee <lee...@gm...>
> >>
> >> Please post a simple, standalone script that reproduces your problem,
> >> so that we can track down what is causing the problem. I don't think
> >> there has been any report of a similar issue (but not sure). As far as
> >> I know, autofmt_xdata only adjusts the alignment and rotation of the
> >> ticklabels and does not change the font property.
> >>
> >> -JJ
> >>
> >>
> >> On Thu, Jul 16, 2009 at 10:55 AM, Domenico
> >> Nappo<dom...@gm...> wrote:
> >> > Whenever I try to use autofmt_xdate() on a Figure(), dates on x axis
> >> > disappear...I guess this is related with something concerning font
> >> > management...
> >> > Anyone experienced this kind of issues?
> >> >
> >> > I use most recent versions of matplotlib, numpy, gtk2, pygtk on a
> Python
> >> > 2.5
> >> > platform (installed via binaries on a window xp machine).
> >> >
> >> >
> >> >
> ------------------------------------------------------------------------------
> >> > Enter the BlackBerry Developer Challenge
> >> > This is your chance to win up to $100,000 in prizes! For a limited
> time,
> >> > vendors submitting new applications to BlackBerry App World(TM) will
> >> > have
> >> > the opportunity to enter the BlackBerry Developer Challenge. See full
> >> > prize
> >> > details at: http://p.sf.net/sfu/Challenge
> >> > _______________________________________________
> >> > Matplotlib-users mailing list
> >> > Mat...@li...
> >> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> >> >
> >> >
> >
> >
>

As the warning message indicates, I think this is a backend issue.
The recommended backend (for screen display) is the Agg family, e.g.,
TkAgg, GTKAgg, etc.

I rarely use Windows and I never used matplotlib on Windows, so there
is not much I can help.
I'm not sure which backend is available on Windows, but try some other backend.

http://matplotlib.sourceforge.net/faq/installing_faq.html#what-is-a-backend

Also, please check out the binary installer for windows,

http://matplotlib.sourceforge.net/faq/installing_faq.html#windows-questions

Regards,

-JJ


On Tue, Jul 21, 2009 at 4:01 AM, Domenico Nappo<dom...@gm...> wrote:
> Hi JJ,
> thanks for your reply.
> Let me say first that I've some problems with installation, I think: when I
> try to run ipython -pylab I got the following:
> C:\Documents and Settings\user>ipython -pylab
> Traceback (most recent call last):
>   File "C:\Python25\scripts\ipython.py", line 28, in <module>
>   IPython.Shell.start().mainloop()
>   File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 1233, in start
>   return shell(user_ns = user_ns)
>   File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 1108, in
> __init__
>   shell_class=MatplotlibMTShell)
>   File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 793, in
> __init__
>   on_kill=[mainquit])
>   File "C:\Python25\Lib\site-packages\IPython\ipmaker.py", line 103, in
> make_IPython
>   embedded=embedded,**kw)
>   File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 639, in
> __init__
>   user_ns,user_global_ns,b2 =
> self._matplotlib_config(name,user_ns,user_global_ns)
>   File "C:\Python25\Lib\site-packages\IPython\Shell.py", line 559, in
> _matplotlib_config
>   import matplotlib.pylab as pylab
>   File "C:\Python25\Lib\site-packages\matplotlib\pylab.py", line 253, in
> <module>
>   from matplotlib.pyplot import *
>   File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 75, in
> <module>
>   new_figure_manager, draw_if_interactive, show = pylab_setup()
>   File "C:\Python25\Lib\site-packages\matplotlib\backends\__init__.py", line
> 25, in pylab_setup
>   globals(),locals(),[backend_name])
>   File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_gtk.py",
> line 25, in <module>
>   from matplotlib.backends.backend_gdk import RendererGDK, FigureCanvasGDK
>   File "C:\Python25\lib\site-packages\matplotlib\backends\backend_gdk.py",
> line 29, in <module>
>   from matplotlib.backends._backend_gdk import pixbuf_get_pixels_array
> ImportError: No module named _backend_gdk
>
> If I comment the import statement for _backend_gdk in backend_gdk.py,
> ipython runs well.
> Below, the code:
> In [20]:
> X=load('E:\\user\\Applicazioni\\EFGExtractor\\dataJan03Dec08.matplotlibtest',converters={0:strpdate2num('%Y-%m-%d')})
>
> In [21]: time = X[:,0]
>
> In [22]: time
> Out[22]: array([ 731216., 731217., 731218., ..., 733040., 733041., 733042.])
>
> In [23]: data = X[:,1]
>
> In [24]: data
> Out[24]: array([ 150., 140., 142., ..., 92., 84., 76.])
>
>
> In [30]: fig = figure()
>
> In [31]: ax = fig.add_subplot(111)
>
> In [32]: ax.plot_date(time, data, '-')
> Out[32]: [<matplotlib.lines.Line2D object at 0x0218B030>]
>
> In [33]: show()
>
> In [34]: fig.autofmt_xdate()
>
>
> In [37]:
> C:\Python25\lib\site-packages\matplotlib\backends\backend_gdk.py:148:
> UserWarning: backend_gdk: unable to draw text at angles other than 0 or 90
>   'other than 0 or 90')
> This time I've noticed the warning above: "unable to draw text at angles
> other than 0 or 90"
> Thanks in advance for any clarification...
> 2009/7/17 Jae-Joon Lee <lee...@gm...>
>>
>> Please post a simple, standalone script that reproduces your problem,
>> so that we can track down what is causing the problem. I don't think
>> there has been any report of a similar issue (but not sure). As far as
>> I know, autofmt_xdata only adjusts the alignment and rotation of the
>> ticklabels and does not change the font property.
>>
>> -JJ
>>
>>
>> On Thu, Jul 16, 2009 at 10:55 AM, Domenico
>> Nappo<dom...@gm...> wrote:
>> > Whenever I try to use autofmt_xdate() on a Figure(), dates on x axis
>> > disappear...I guess this is related with something concerning font
>> > management...
>> > Anyone experienced this kind of issues?
>> >
>> > I use most recent versions of matplotlib, numpy, gtk2, pygtk on a Python
>> > 2.5
>> > platform (installed via binaries on a window xp machine).
>> >
>> >
>> > ------------------------------------------------------------------------------
>> > Enter the BlackBerry Developer Challenge
>> > This is your chance to win up to $100,000 in prizes! For a limited time,
>> > vendors submitting new applications to BlackBerry App World(TM) will
>> > have
>> > the opportunity to enter the BlackBerry Developer Challenge. See full
>> > prize
>> > details at: http://p.sf.net/sfu/Challenge
>> > _______________________________________________
>> > Matplotlib-users mailing list
>> > Mat...@li...
>> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>> >
>> >
>
>

Hi,

I just created a hsv-like color map with gray levels only, now I'd like to
use this as default color map. But how? Calling it like hsv() does not work
and I did not find a hint in the documentation how to set a user defined
color map interactively as default color map.

Cheers

Philipp
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Hi, Darren,

  many thanks for your answer. Now all works.

Regards,
  Alexander Bruy

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Thanks!

On Mon, Jul 20, 2009 at 3:44 PM, Jae-Joon Lee<lee...@gm...> wrote:
> index for subplot starts from 1, not 0 (the convention is from Matlab).
>
> Regards,
>
> -JJ
>
>
> On Mon, Jul 20, 2009 at 6:31 PM, W. Augustine Dunn
> III<wad...@gm...> wrote:
>> Hello y'all:
>>
>> I am trying to plot a fig with three subplots.  However when I run my
>> script the subplots are all shifted way too high
>> (http://img.skitch.com/20090720-fp462u8ww4bq38j29u9bjtr2cx.png) and
>> the top subplot is cut off.
>>
>> I tried doing something like this from reading another poster's thread
>> but this did absolutely nothing:
>> mpl.figure.SubplotParams(left=      (48 / 72.0) / figW,   # 48-point left margin
>>                                      bottom=    (36 / 72.0) / figH,   # etc.
>>                                      right= 1 - (18 / 72.0) / figW,
>>                                      top=   1 - (12 / 72.0) / figH)
>>
>> Anyone have an idea how to fix this.
>>
>> Thank you for your time.
>>
>> Gus
>>
>> The code is below for those interested:
>> <code>
>> supTitle = 'Ortholog Pairs Matching "Real" or "Control" Ag miRNA seeds.'
>>
>> data = []
>> for dFile in iFiles:
>>    data.append(pickle.load(open(dFile,'rU')))
>>
>> ks = []
>> for i in range(len(data)):
>>    ks.append(sorted(data[i].keys()))
>>
>> for i in range(len(ks)):
>>    if "!doc" in ks[i]: ks[i].pop(0)  # if the pkl has a !doc entry.  pop it
>>    assert odd_or_even(len(ks[i])) == 'even', 'Error: len(ks[i]) must be even.'
>> pos1Data = eval('[%s]' % ('[],'*len(data)))
>> pos1Keys = eval('[%s]' % ('[],'*len(data)))
>> pos2Data = eval('[%s]' % ('[],'*len(data)))
>> pos2Keys = eval('[%s]' % ('[],'*len(data)))
>>
>> for i in range(len(ks)):
>>    for j in range(len(ks[i])):
>>        if odd_or_even(j) == 'even': # remember that we start with 0
>> which is even.
>>            pos1Data[i].append(data[i][ks[i][j]])
>>            pos1Keys[i].append(ks[i][j])
>>        else:
>>            pos2Data[i].append(data[i][ks[i][j]])
>>            pos2Keys[i].append(ks[i][j])
>>
>> figW = 16
>> figH = 8
>> plt.figure(num=None, figsize=None, dpi=None, facecolor='w', edgecolor='k')
>> subplotpars=mpl.figure.SubplotParams(left=      (48 / 72.0) / figW,
>> # 48-point left margin
>>                                     bottom=    (36 / 72.0) / figH,   # etc.
>>                                     right= 1 - (18 / 72.0) / figW,
>>                                     top=   1 - (12 / 72.0) / figH)
>>
>> plt.suptitle(supTitle)
>> for i in range(len(data)):
>>    matches1 = [x[0] for x in pos1Data[i]]
>>    ctrls1   = [-x[1] for x in pos1Data[i]]
>>    matches2 = [x[0] for x in pos2Data[i]]
>>    ctrls2   = [-x[1] for x in pos2Data[i]]
>>
>>    assert len(matches1) == len(matches2), 'Error: matches1 and
>> matches 2 do not have the same number of elements!'
>>    N = len(matches1)
>>
>>
>>
>>    ind = np.arange(N)    # the x locations for the groups
>>    width = 0.35       # the width of the bars: can also be len(x) sequence
>>
>>
>>    plt.subplot(len(data),1,i,)
>>    p1 = plt.bar(ind, ctrls1,   width, color='w',)
>>    p2 = plt.bar(ind, matches1, width, color='b',)
>>    p3 = plt.bar(ind+width, ctrls2,   width, color='w',)
>>    p4 = plt.bar(ind+width, matches2, width, color='b', )
>>    plt.ylabel(subTitles[i])
>>    if i == len(data)-1:
>>        plt.xlabel('miRNA seed')
>>
>>    axMax = max(matches1+matches2)*1.1
>>    axMin = min(ctrls1+ctrls2)*1.1
>>    #plt.axis([0,len(matches1),axMin,axMax])
>>    if i == 0:
>>        plt.legend( (p2[0], p1[0]), ('Real', 'Ctrls'), loc=(1.01,0.65) )
>> </code>
>>
>> ------------------------------------------------------------------------------
>> Enter the BlackBerry Developer Challenge
>> This is your chance to win up to $100,000 in prizes! For a limited time,
>> vendors submitting new applications to BlackBerry App World(TM) will have
>> the opportunity to enter the BlackBerry Developer Challenge. See full prize
>> details at: http://p.sf.net/sfu/Challenge
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>



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