matplotlib-users Mailing List for matplotlib

On May 8, 2007, at 1:22 PM, Fernando Perez wrote:
> On 5/8/07, Aaron Hoover <ah...@ee...> wrote:
>
>> > I have been using the qt4 backend with ipython for maybe a year
>> > now, currently
>> > ipython 0.8.0. What is the output of "ipython -Version"?
>>
>> ipython -Version gives:
>>
>> 0.8.0
>>
>> Specifically, the error seems to be happening on line 838 of Shell.py
>> in the mainloop() function:
>> ...
>> --> 838 self.timer.start( self.TIMEOUT, True )
>> ...
>>
>> TypeError: too many arguments to QTimer.start(), 1 at most expected
>
> Is this an unaltered ipython, along with a matplotlib configured to
> use Qt4 as its backend? You mentioned having modified ipython
> yourself, which is most definitely NOT needed.
>
> I recently used this same ipython with the qt4 backend for several
> days without any problem, so your report is rather mysterious...
>
> So, make sure that:
>
> 1. You have a fully unmodified ipython.
>
> 2. Your matplotlibrc file has the proper backend setting:
>
> backend : Qt4Agg
>
>
> We should be able to track this down, since we know it works fine for
> others (myself and Darren included).
Indeed, I just removed my old IPython directory in site-packages and 
reinstalled - that fixed the problem.
Thanks for all the help.
Aaron

On 5/8/07, Aaron Hoover <ah...@ee...> wrote:
> > I have been using the qt4 backend with ipython for maybe a year
> > now, currently
> > ipython 0.8.0. What is the output of "ipython -Version"?
>
> ipython -Version gives:
>
> 0.8.0
>
> Specifically, the error seems to be happening on line 838 of Shell.py
> in the mainloop() function:
> ...
> --> 838 self.timer.start( self.TIMEOUT, True )
> ...
>
> TypeError: too many arguments to QTimer.start(), 1 at most expected
Is this an unaltered ipython, along with a matplotlib configured to
use Qt4 as its backend? You mentioned having modified ipython
yourself, which is most definitely NOT needed.
I recently used this same ipython with the qt4 backend for several
days without any problem, so your report is rather mysterious...
So, make sure that:
1. You have a fully unmodified ipython.
2. Your matplotlibrc file has the proper backend setting:
backend : Qt4Agg
We should be able to track this down, since we know it works fine for
others (myself and Darren included).
cheers,
f

>
> On Tuesday 08 May 2007 02:43:45 pm Aaron Hoover wrote:
>> Hi All,
>>
>> I was excited to see that a Qt4 backend is available for matplotlib -
>> I'm running 0.87.7. So, I installed PyQt4 from source from the
>> riverbankcomputing website (OSX comes with the Qt framework already
>> installed), and tried to give it a go.
>>
>> First off I got the error:
>>
>> "No module named qt"
>>
>> So, I went into the Shell.py script in the IPython subdirectory of
>> site-packages and changed all instances of "import qt" to "from PyQt4
>> import Qt as qt".
>
> There is already support for the qt4 backend in ipython, you should 
> not have
> to make any changes to (recent versions of) ipython.
>
>> It fixed the module not found error, but now
>> I get the following error in Shell.py
>>
>> "TypeError: too many arguments to QTimer.start(), 1 at most expected"
>>
>> I realize that this is more likely an error with ipython, but I'm
>> wondering if anyone else has seen this. If so, have people verified
>> that ipython (0.80) is indeed compatible with the Qt4Agg backend.
>
> I have been using the qt4 backend with ipython for maybe a year 
> now, currently
> ipython 0.8.0. What is the output of "ipython -Version"?
ipython -Version gives:
0.8.0
Specifically, the error seems to be happening on line 838 of Shell.py 
in the mainloop() function:
...
--> 838 self.timer.start( self.TIMEOUT, True )
...
TypeError: too many arguments to QTimer.start(), 1 at most expected
Thanks,
Aaron

Thanks, Philip. I wasn't aware of gmane. I only did a google search.
Regards,
> -----Original Message-----
> From: Philip Austin [mailto:pa...@eo...] 
> Sent: Tuesday, May 08, 2007 11:51 AM
> To: kc1...@ya...
> Cc: mat...@li...
> Subject: Re: [Matplotlib-users] plotting wind-speed time series
> 
> 
> kc1...@ya... writes:
> > 
> > I have not received a response from the author. Could you please
> > post version 5 of windrose.py?
> 
> The Gmane search page is a great resource for this kind of thing:
> 
http://search.gmane.org/?query=windrose&author=Lionel+Roubeyrie&group=gmane.comp.python.*&sort=date&DEFAULTOP=and&xP=windrose%09py&xFILTERS=Gcomp.python.*-Alionel+roubeyrie---A
http://article.gmane.org/gmane.comp.python.matplotlib.general/7041/match=windrose
regards, Phil
 
--
John Henry

On Tuesday 08 May 2007 02:43:45 pm Aaron Hoover wrote:
> Hi All,
>
> I was excited to see that a Qt4 backend is available for matplotlib -
> I'm running 0.87.7. So, I installed PyQt4 from source from the
> riverbankcomputing website (OSX comes with the Qt framework already
> installed), and tried to give it a go.
>
> First off I got the error:
>
> "No module named qt"
Are you setting your backend to qt4agg and not qtagg?

On Tuesday 08 May 2007 02:43:45 pm Aaron Hoover wrote:
> Hi All,
>
> I was excited to see that a Qt4 backend is available for matplotlib -
> I'm running 0.87.7. So, I installed PyQt4 from source from the
> riverbankcomputing website (OSX comes with the Qt framework already
> installed), and tried to give it a go.
>
> First off I got the error:
>
> "No module named qt"
>
> So, I went into the Shell.py script in the IPython subdirectory of
> site-packages and changed all instances of "import qt" to "from PyQt4
> import Qt as qt". 
There is already support for the qt4 backend in ipython, you should not have 
to make any changes to (recent versions of) ipython.
> It fixed the module not found error, but now 
> I get the following error in Shell.py
>
> "TypeError: too many arguments to QTimer.start(), 1 at most expected"
>
> I realize that this is more likely an error with ipython, but I'm
> wondering if anyone else has seen this. If so, have people verified
> that ipython (0.80) is indeed compatible with the Qt4Agg backend.
I have been using the qt4 backend with ipython for maybe a year now, currently 
ipython 0.8.0. What is the output of "ipython -Version"?

Jesper Larsen wrote:
> On Monday 07 May 2007 16:46, Jeff Whitaker wrote:
> 
>> Jesper: Can you be more specific about why you need a deepcopy? Those
>> methods you mention do not modify the Basemap instance, although they do
>> modify the axes instance they are used with. It shouldn't be a problem
>> reusing the Basemap instance with a new axes instance (without using
>> using deepcopy).
>> 
>
> Thanks Jeff,
>
> You are absolutely right, I have changed my code so that it does not perform a 
> deepcopy now. I must have done something wrong when I wrote the code some 
> time ago (I think, maybe I was confused by the memory issues we discussed a 
> while ago).
>
> I am considering reusing an entire figure instance (which I guess I will have 
> to copy) as well instead of just the basemap instance but I don't know if it 
> is worth the effort or it is just as fast to redo the figure based on the 
> basemap instance. I consider doing it because the map decorations are 
> unchanged between the plots - a profiling of the application reveals that 
> they take a considerable amount of time to perform. Any recommendations on 
> that issue?
>
> - Jesper
>
> Ps. You can see a test/development version of the web application for which I 
> am using matplotlib/basemap in (besides for my scientific work) here (if it 
> is running when you read this):
>
> http://ocean.dmi.dk/apps/forecast/
>
> (some bugs remain)
> 
Jesper: You might consider just deleting the figure elements that you 
don't want to re-use (instead of figuring out everything you do want to 
re-use).
Very nice web site! Are the plots generated on the fly, or are they 
pre-generated?
-Jeff
-- 
Jeffrey S. Whitaker Phone : (303)497-6313
NOAA/OAR/CDC R/PSD1 FAX : (303)497-6449
325 Broadway Boulder, CO, USA 80305-3328

kc1...@ya... writes:
 > 
 > I have not received a response from the author. Could you please
 > post version 5 of windrose.py?
The Gmane search page is a great resource for this kind of thing:
http://search.gmane.org/?query=windrose&author=Lionel+Roubeyrie&group=gmane.comp.python.*&sort=date&DEFAULTOP=and&xP=windrose%09py&xFILTERS=Gcomp.python.*-Alionel+roubeyrie---A
http://article.gmane.org/gmane.comp.python.matplotlib.general/7041/match=windrose
regards, Phil

Hi All,
I was excited to see that a Qt4 backend is available for matplotlib - 
I'm running 0.87.7. So, I installed PyQt4 from source from the 
riverbankcomputing website (OSX comes with the Qt framework already 
installed), and tried to give it a go.
First off I got the error:
"No module named qt"
So, I went into the Shell.py script in the IPython subdirectory of 
site-packages and changed all instances of "import qt" to "from PyQt4 
import Qt as qt". It fixed the module not found error, but now
I get the following error in Shell.py
"TypeError: too many arguments to QTimer.start(), 1 at most expected"
I realize that this is more likely an error with ipython, but I'm 
wondering if anyone else has seen this. If so, have people verified 
that ipython (0.80) is indeed compatible with the Qt4Agg backend.
Any ideas how I can fix this?
Thanks,
Aaron

Derek,
When you say "on version 5", do you mean windrose itself is on version 5? May be that's why in your sample code, you invoked windrose via:
freq,ax=windrose.windplot(ventV,ventD,counts=False,speed_classes=[0.1,0.2,0.3,0.4,0.5],sectors=8,style='bar2')
but the version of windrose from John Hunter's message (http://www.nabble.com/windrose-t1392107.html) doesn't look anywhere like that.
I have not received a response from the author. Could you please post version 5 of windrose.py?
Appreciate it.
<quote author='Derek Hohls'>
I would suggest contacting the author directly. windrose.py
is on version 5 (AFAIK). I have used it on a project and it works 
well.
Derek
>>> "John Hunter" <jd...@gm...> 05/04/07 10:34 PM >>>
On 5/4/07, Alan Jackson <al...@aj...> wrote:
> On Fri, 4 May 2007 12:15:13 -0700 (PDT)
> kc1...@ya... wrote:
>
> > Saw this:
> >
> >
http://www.originlab.com/www/products/GraphGallery.aspx?GID=26&s=8&lm=215
> >
> > Since I am not interested in wind direction, may be I can use
stacked bar-chart. Still, how would I tie plot_data with it though?
grab "windrose.py" at the end of this thread
http://www.nabble.com/windrose-t1392107.html
I've not used it but I think it is what you are looking for: a
windrose module for python.
JDH
</quote>
 
--
John Henry

On Monday 07 May 2007 16:46, Jeff Whitaker wrote:
> Jesper: Can you be more specific about why you need a deepcopy? Those
> methods you mention do not modify the Basemap instance, although they do
> modify the axes instance they are used with. It shouldn't be a problem
> reusing the Basemap instance with a new axes instance (without using
> using deepcopy).
Thanks Jeff,
You are absolutely right, I have changed my code so that it does not perform a 
deepcopy now. I must have done something wrong when I wrote the code some 
time ago (I think, maybe I was confused by the memory issues we discussed a 
while ago).
I am considering reusing an entire figure instance (which I guess I will have 
to copy) as well instead of just the basemap instance but I don't know if it 
is worth the effort or it is just as fast to redo the figure based on the 
basemap instance. I consider doing it because the map decorations are 
unchanged between the plots - a profiling of the application reveals that 
they take a considerable amount of time to perform. Any recommendations on 
that issue?
- Jesper
Ps. You can see a test/development version of the web application for which I 
am using matplotlib/basemap in (besides for my scientific work) here (if it 
is running when you read this):
http://ocean.dmi.dk/apps/forecast/
(some bugs remain)

Look at two_scales.py in the "examples" directory of the source 
distribution.
Johann
On Tuesday, 8 May 2007 09:59, Schmidt Michael wrote:
> Hi,
>
> I am pretty new to python and matplotlib -
>
> I am struggeling a bit doing a 2d plot with two graphs in one with
> different scaling on the left and right y-axis e.g. time vs
> temperature and rainfall?
>
> Can someone give me a hint or example-code?
>
> Cheers Michael
>

Hi,
I am pretty new to python and matplotlib -=20
I am struggeling a bit doing a 2d plot with two graphs in one with
different scaling on the left and right y-axis e.g. time vs temperature
and rainfall?
Can someone give me a hint or example-code?
Cheers Michael
=20
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John
 
If you look through the thread, you will see I have responded before
saying I that had used this code successfully. I did not find any 
detailed documentation necessary... the program is really self-
explanatory and well-commented.
 
Here is a sample that works for me:
 
from pylab import *
import windrose
figure(figsize=(8,8), facecolor='w')
ventV = [ 0.2, 0.2, 0.35, 0.09, 0.55, 0.5, 0.2, 0.33, 0.44, 0.22 ]
ventD = [ 65., 59., 74., 231., 268., 283., 166., 214., 66., 114.]
freq,ax=windrose.windplot(ventV,ventD,counts=False,speed_classes=[0.1,0.2,0.3,0.4,0.5],sectors=8,style='bar2')
title("And here is the title!", fontsize=14)
fig=ax.get_figure()
#for leg in fig.legends:
# setp(leg.get_texts(), fontsize=8)
draw()
show()
 
The commented code is in case you want to set the font
size for the legend.
 
Derek
 
PS As I said before, I suggest you get the latest version.
>>> <kc1...@ya...> 2007年05月07日 11:47 PM >>>
Thanks to everybody that responded to my question.
After looking at the different options, I do agree that windrose.py
fits my need the best. Unfortunately, there is insufficient information
embedded in the code to the point where I can use it. I sent the author
a email requesting more info and hopefully he would respond.
Just in case, have anybody used this code successfully? If so, could
you please share a sample dataset to use windrose.py?
Thanks,
> 
> 
> grab "windrose.py" at the end of this thread
> 
>http://www.nabble.com/windrose-t1392107.html 
>I've not used it but I think it is what you are looking for: a
windrose module for python.
>JDH
--
John Henry
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