matplotlib-users Mailing List for matplotlib (Page 8)

>>>>> "belinda" == belinda thom <bt...@cs...> writes:
 belinda> I can create plots to my hearts content in both, but when
 belinda> I ask to rescale the plots, e.g. axis([-.2,2.4,-2,2.4]),
 belinda> NOTHING happens to the figure drawn via IDLE, whereas the
 belinda> command works as expected in IPython.
Are you running matplotlib in idle in "interactive" mode, as described 
http://matplotlib.sourceforge.net/interactive.html
ipython in pylab mode automatically turns on interactive mode...
JDH

I have experienced the same problem with IDLE.
It only works with -n, but then you lose the nice feature of 'starting
over'.
Does anybody know a fix so we can do both?
Thanks,
Mark
BTW, when you use pylab in interactive mode, the axis() command should scale
your figure interactively, also under IDLE. Have you tried that?

Hi,
How can I use zoom for polar plots ?
I mean a circular cutout would be better than a rectangular cutout.
Nils

I also had a problem matching matplotlib's mathfonts with my Beamer
(http://latex-beamer.sourceforge.net) presentation's Helvetica (or
sans-serif) mathfonts.
As LaTeX does not support Helvetica Math unless you buy it from
Micropress, I was curious as to how Till Tantau managed to implement
sans-serif mathfonts in his beamer class.
After some hacking-and-slashing I've isolated the necessary LaTeX code
to generate "beamer compatible" sans-serif math fonts, see attached .tex
file:
The easiest way to "convert" your mpl installation to generate
sans-serif math fonts is to search for "\begin{document}" in your
backend_ps.py file and then to past the attached LaTeX code just above
it.
A more permanent solution to mpl, with Darren's approval, would be the
attached patches to backend_ps.py and texmanager.py
These patches also include the option to add to the default LaTeX
preamble used by texmanager.py & backend_ps.py, e.g.:
rcParams['latex.preamble']=3Dr"""\usepackage{amsmath,amssymb}
\usepackage[afrikaans]{babel}
\usepackage[iso,english]{isodate}
\usepackage{numprint}
"""
Kind regards,
Peter-Jan Randewijk
> -----Original Message-----
> From: mat...@li...=20
> [mailto:mat...@li...] On=20
> Behalf Of Lane Brooks
> Sent: 09 January 2007 19:56
> To: mat...@li...
> Subject: [Matplotlib-users] mathtext fonts
>=20
> Is there a way to get latex to use Ariel font and not italic?=20
> If I use the \rm{} command I can get rid of italic, but it=20
> is using a serif font and I cannot find any documentation on=20
> how to change that font.
>=20
> Thanks,
>=20
> Lane Brooks
>=20
> --------------------------------------------------------------
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>=20

I had the same problem about figures that freeze using IDLE and 
matplotlib but finally I manage to solve it with the help of Eric and 
also a bit of luck.
Instead of using TkAgg I use WxAgg and it never hangs.
I use Idle -n and in the matplotlibrc set Interactive
I use all latest version of Numpy, scipy, matplotlib and 
wxPython2.8-win32-unicode-2.8.0.1-py25
Hope this will help
Giorgio

Belinda -
The hold state is on by default when you use pylab. To clear a figure you
use clf().
Here's a brief example:
from pylab import *
figure() # Not really needed, you could have typed plot right away, but here
you can set some nice features like the size
plot([1,2,3])
plot([2,1,2]) # Will appear on same figure
clf() # Clears entire figure (back to what you had with figure() )
Mark
Message: 10
> Date: 2007年1月09日 19:50:15 -0800
> From: belinda thom <bt...@cs...>
> Subject: [Matplotlib-users] clearing a figure
> To: matplotlib-users <mat...@li...>
> Message-ID: <3E7...@cs...>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> Hello,
>
> I'm a new matplotlib user, coming from the Matlab end.
>
> Is there a standard way to create a figure (here I'd like the
> equivalent of matlab's hold on, so I can draw multiple things) and
> then clear the figure (so the drawing goes away) so I can repeat the
> process again? The commands to plot that I'll be using are fairly
> simple line commands.
>
>
>
>
>
>
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>
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> End of Matplotlib-users Digest, Vol 8, Issue 13
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>

belinda thom wrote:
> One of the reasons I'm confused is b/c when I poked around, I found a 
> clear method:
> 
> >>> help(pylab.gcf().clear)
> Help on method clear in module matplotlib.figure:
> 
> clear(self) method of matplotlib.figure.Figure instance
> Clear the figure
> 
> but when I execute this on my open figure:
> 
> >>>pylab.gcf().clear()
> 
> nothing happens; the figure's still displaying whatever was already 
> on it.
The reason is that in interactive mode (as with ipython -pylab) the 
figure is not redrawn after you execute this method. What you want 
instead is
pylab.clf()
which will call the clear and then call draw_if_interactive().
This is the big difference between most pylab functions and the 
corresponding axes or figure methods that they wrap: the pylab functions 
automatically take care of redrawing the figure if you are in an 
interactive mode.
> 
> So far, the only thing I've found that works is to call plot 
> differently when its time to clear the figure (pass hold=False). 
> Subsequent calls to plot (w/o this option) keep adding to, which is 
> great.
pylab also has a hold() function similar to the Matlab command, as an 
alternative to passing the hold state in the plotting command call:
def hold(b=None):
 """
 Set the hold state. If hold is None (default), toggle the
 hold state. Else set the hold state to boolean value b.
 Eg
 hold() # toggle hold
 hold(True) # hold is on
 hold(False) # hold is off
 When hold is True, subsequent plot commands will be added to the
 current axes. When hold is False, the current axes and figure
 will be cleared on the next plot command
Eric
> 
> Is passing a hold=False arg to a drawing command the preferred way to 
> clear a figure, or is clear() not working properly?
> 
> Many thanks,
> 
> --b
> 
> On Jan 9, 2007, at 7:50 PM, belinda thom wrote:
> 
>> Hello,
>>
>> I'm a new matplotlib user, coming from the Matlab end.
>>
>> Is there a standard way to create a figure (here I'd like the 
>> equivalent of matlab's hold on, so I can draw multiple things) and 
>> then clear the figure (so the drawing goes away) so I can repeat 
>> the process again? The commands to plot that I'll be using are 
>> fairly simple line commands.

Hi,
I've been playing w/both IDLE and IPython, using TkAgg in both cases 
as the back end. Also, I've got the latest matplotlib and ipython 
versions and am using MacPython's 2.4.4 IDLE.
It seems that if IDLE is not invoked w/the -n flag, the figures that 
are drawn can often get the "whirling swirl of death" (i.e. they 
hang). Has it been other users' experience that the "-n" removes that 
problem (it mentioned this flag in the manual, but I didn't catch he 
motivation)? And if so, is there no other way to use IDLE when using 
matplotlib interactively? (The nice thing about IDLE is its "fresh" 
state each time you run a file; this goes away when -n is used).
I'm pleased to report no whirling wheels when using matplotlib via 
IPython.
By being able to compare behavior on both I might have found a bug:
I can create plots to my hearts content in both, but when I ask to 
rescale the plots, e.g. axis([-.2,2.4,-2,2.4]), NOTHING happens to 
the figure drawn via IDLE, whereas the command works as expected in 
IPython.
I hope posting this is useful. Feedback welcome.
--b

One of the reasons I'm confused is b/c when I poked around, I found a 
clear method:
 >>> help(pylab.gcf().clear)
Help on method clear in module matplotlib.figure:
clear(self) method of matplotlib.figure.Figure instance
 Clear the figure
but when I execute this on my open figure:
 >>>pylab.gcf().clear()
nothing happens; the figure's still displaying whatever was already 
on it.
So far, the only thing I've found that works is to call plot 
differently when its time to clear the figure (pass hold=False). 
Subsequent calls to plot (w/o this option) keep adding to, which is 
great.
Is passing a hold=False arg to a drawing command the preferred way to 
clear a figure, or is clear() not working properly?
Many thanks,
--b
On Jan 9, 2007, at 7:50 PM, belinda thom wrote:
> Hello,
>
> I'm a new matplotlib user, coming from the Matlab end.
>
> Is there a standard way to create a figure (here I'd like the 
> equivalent of matlab's hold on, so I can draw multiple things) and 
> then clear the figure (so the drawing goes away) so I can repeat 
> the process again? The commands to plot that I'll be using are 
> fairly simple line commands.
>
>
>

Hello,
I'm a new matplotlib user, coming from the Matlab end.
Is there a standard way to create a figure (here I'd like the 
equivalent of matlab's hold on, so I can draw multiple things) and 
then clear the figure (so the drawing goes away) so I can repeat the 
process again? The commands to plot that I'll be using are fairly 
simple line commands.

>>>>> "Marcel" == Marcel Oliver <m.o...@iu...> writes:
 Marcel> TypeError: set_ylim() got an unexpected keyword argument
 Marcel> 'xmin' WARNING: Failure executing file: <colonius.py>
This is a bug -- thanks for reporting it. I just committed changes to
svn to fix it.
JDH

It is a bug. I don't know how or when it was introduced. I can fix it 
in svn later today.
Eric
Marcel Oliver wrote:
> Hi, I am running some code which used to work a couple of months ago,
> but now fails on the "axis" command which does not seem to accept
> keyword arguments any longer (current version 0.87.7 from Fedora
> Extras, previous version probably 0.87.4 or so). Traceback is
> below...
> 
> Any ideas?
> 
> Thanks,
> Marcel
> 
> 
> /home/marcel/src/python/advection/paper1/colonius.py in colonius(Q, full)
> 93 figure ()
> 94 xlabel (r'$\xi$')
> ---> 95 axis (xmin=0, xmax=pi)
> 96 plot (xxiplot, omega(xxiplot), "k-",
> 97 xxiplot, dwdxi (xxiplot), "k--",
> 
> /usr/lib/python2.4/site-packages/matplotlib/pylab.py in axis(*v, **kwargs)
> 622 """
> 623 ax = gca()
> --> 624 v = ax.axis(*v, **kwargs)
> 625 draw_if_interactive()
> 626 return v
> 
> /usr/lib/python2.4/site-packages/matplotlib/axes.py in axis(self, *v, **kwargs)
> 775 except IndexError:
> 776 xmin, xmax = self.set_xlim(**kwargs)
> --> 777 ymin, ymax = self.set_ylim(**kwargs)
> 778 return xmin, xmax, ymin, ymax
> 779 
> 
> TypeError: set_ylim() got an unexpected keyword argument 'xmin'
> WARNING: Failure executing file: <colonius.py>
> 
> 
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Hi, I am running some code which used to work a couple of months ago,
but now fails on the "axis" command which does not seem to accept
keyword arguments any longer (current version 0.87.7 from Fedora
Extras, previous version probably 0.87.4 or so). Traceback is
below...
Any ideas?
Thanks,
Marcel
/home/marcel/src/python/advection/paper1/colonius.py in colonius(Q, full)
 93 figure ()
 94 xlabel (r'$\xi$')
---> 95 axis (xmin=0, xmax=pi)
 96 plot (xxiplot, omega(xxiplot), "k-",
 97 xxiplot, dwdxi (xxiplot), "k--",
/usr/lib/python2.4/site-packages/matplotlib/pylab.py in axis(*v, **kwargs)
 622 """
 623 ax = gca()
--> 624 v = ax.axis(*v, **kwargs)
 625 draw_if_interactive()
 626 return v
/usr/lib/python2.4/site-packages/matplotlib/axes.py in axis(self, *v, **kwargs)
 775 except IndexError:
 776 xmin, xmax = self.set_xlim(**kwargs)
--> 777 ymin, ymax = self.set_ylim(**kwargs)
 778 return xmin, xmax, ymin, ymax
 779 
TypeError: set_ylim() got an unexpected keyword argument 'xmin'
WARNING: Failure executing file: <colonius.py>

Hi
have a Python application using matplotlib installed on a windows machine 
using PY2EXE. Am having some problems because the application appears to 
be writing some temporary files to C:\ but users do not have permission to 
write to this directory. It looks like matplotlib is writing the temporary 
files - can I supress these files? If not, how do I "tell" matplotlib to 
write somewhere else (eg C:\windows\temp)? Thanks in advance
Alun Griffiths

On Tuesday 09 January 2007 13:54, Christopher Barker wrote:
> > On Tuesday 09 January 2007 12:56, Lane Brooks wrote:
> >> Is there a way to get latex to use Ariel font and not italic? If I use
> >> the \rm{} command I can get rid of italic, but it is using a serif font
> >> and I cannot find any documentation on how to change that font.
>
> You can't (easily )get Ariel, but you can get a SanSerif font.
>
> \rm{} means "Roman Font"
>
> you want:
>
> \sf{} (Sans Serif Font)
>
> -Chris
>
> NOTE: I've never used this with MPL, but that's the LaTeX way.
Not to be picky, but those are technically TeX commands. usetex uses LaTeX, 
which will accept these TeX font commands, but in a few cases they give 
results that are not ideal. Better to use the LaTeX versions: \textrm, 
\textsf, etc.

> On Tuesday 09 January 2007 12:56, Lane Brooks wrote:
>> Is there a way to get latex to use Ariel font and not italic? If I use
>> the \rm{} command I can get rid of italic, but it is using a serif font
>> and I cannot find any documentation on how to change that font.
You can't (easily )get Ariel, but you can get a SanSerif font.
\rm{} means "Roman Font"
you want:
\sf{} (Sans Serif Font)
-Chris
NOTE: I've never used this with MPL, but that's the LaTeX way.
-- 
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chr...@no...

On Tuesday 09 January 2007 12:56, Lane Brooks wrote:
> Is there a way to get latex to use Ariel font and not italic? If I use
> the \rm{} command I can get rid of italic, but it is using a serif font
> and I cannot find any documentation on how to change that font.
Arial fonts are not supported by latex. Beyond that, I can't be of much help 
without a brief example.
Darren

Is there a way to get latex to use Ariel font and not italic? If I use 
the \rm{} command I can get rid of italic, but it is using a serif font 
and I cannot find any documentation on how to change that font.
Thanks,
Lane Brooks

Arg, sorry, stupid question, I didn't use valid limits.
Le Mardi 09 Janvier 2007 12:32, Lionel Roubeyrie a =C3=A9crit=C2=A0:
> Hi all,
> I need to set texts on figures in axis coords, not data coords.
> Following "text" doc, transform=3Dax.transAxes seems not working :
> ######################
>
> |~|[32]>ax=3Dsubplot(111)
> |
> |~|[33]>text( 0.0, 1.0, 'text1', transform=3Dax.transData, color=3D'r' )
>
> Out [33]:<matplotlib.text.Text instance at 0xb487fbec>
>
> |~|[34]>text( 1.0, 1.0, 'text2', transform=3Dax.transAxes, color=3D'b' )
>
> Out [34]:<matplotlib.text.Text instance at 0xb488298c>
> ######################
>
> gives figure in the attached picture. Text2 must be out of figure, not
> here! An idea?
> thanks
=2D-=20
Lionel Roubeyrie - lro...@li...
LIMAIR
http://www.limair.asso.fr

Hi all,
I need to set texts on figures in axis coords, not data coords. 
Following "text" doc, transform=ax.transAxes seems not working :
######################
|~|[32]>ax=subplot(111)
|~|[33]>text( 0.0, 1.0, 'text1', transform=ax.transData, color='r' )
Out [33]:<matplotlib.text.Text instance at 0xb487fbec>
|~|[34]>text( 1.0, 1.0, 'text2', transform=ax.transAxes, color='b' )
Out [34]:<matplotlib.text.Text instance at 0xb488298c>
######################
gives figure in the attached picture. Text2 must be out of figure, not here!
An idea?
thanks
-- 
Lionel Roubeyrie - lro...@li...
LIMAIR
http://www.limair.asso.fr

I just found Section 3.14 Event Handling in the User's Guide, so 
never mind! Thanks anyway and sorry for the newbie spam - I broke 
the rule about reading the manual first before asking! I will try 
some examples.
 - Tom
On Jan 8, 2007, at 3:58 PM, Tom Krauss wrote:
> I am wondering if there is an analog of the axes and/or figure's 
> 'currentpoint' property to access the current mouse location, and 
> the figure's 'windowbuttonmotionfcn' (and up and down respectively) 
> for responding to mouse click events?

Hi,
 I am very new to matplotlib (running 0.87.5 on Mac OS X) and just 
joined this maillist today. I just discovered "getp" and "setp" 
today, very nice!
 I am wondering if there is an analog of the axes and/or figure's 
'currentpoint' property to access the current mouse location, and the 
figure's 'windowbuttonmotionfcn' (and up and down respectively) for 
responding to mouse click events?
 Thanks in advance,
 Tom Krauss

On Fri, Jan 05, 2007 at 10:30:50PM -0500, ch...@se... wrote:
> does fontweight = "..." work for you? I couldn't get that one to work
I sure can't see any difference in the tick labels, at least (didn't try
it for manually-instantiated text).
But what I wonder is whether there is some issue here similar to how the
tick labels don't take the default font.size value ...
Glen

On Monday 08 January 2007 04:34, Gerhard Spitzlsperger wrote:
> Dear All,
>
> I am quite new to matplotlib and facing some trouble using boxplots.
>
> I'd like to plot two boxes (different length of data) in one plot, from
> the docs
> Could you point me to what I do wrong? I need especially
> the different data length.
Gerhard,
Try to install a SVN copy of matplotlib. Eric corrected that bug not long ago.
Alternatively, you can try to force your data into an array with 
data = N.array(data, dtype=N.object) 
beforehand.

Dear All,
I am quite new to matplotlib and facing some trouble using boxplots.
I'd like to plot two boxes (different length of data) in one plot, from 
the docs
I understood:
from pylab import *
data = [[1.1, 2.1, 3.1], [1, 2.1]]
boxplot(data, positions=[1,2])
but this gives me:
Traceback (most recent call last):
 File "boxplot_demo1.py", line 5, in <module>
 data = array([[1.1, 2.1, 3.1], [1, 2.1]])
 File 
"D:\APPS\python25\lib\site-packages\numpy\oldnumeric\functions.py", line 
79, in array
 return mu.array(sequence, dtype, copy=copy)
ValueError: setting an array element with a sequence.
The call succeeds if all entries have the same length, but then
matplotlib seems to use data from rows, not columns so that
Ihave to do:
boxplot(transpose(data), positions=[1,2])
Could you point me to what I do wrong? I need especially
the different data length.
Thank you
Gerhard
I am using python 2.5 matplotlib 0.87.7 on windows XP with numpy 1.0.1
(on older installation with python 2.4 and older numpy has the same issue.
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