matplotlib-users Mailing List for matplotlib (Page 3)

Figured it out.
For posterity:
import matplotlib.cbook
majorLabelText =3D [axis.major.formatter(x,i) for i, x in
 cbook.enumerate(axis.major.locator())]
will get you the text and the labels are accessable via:
majorLabels =3D [tick.label1 for tick in axis.get_major_ticks() if
tick.label1On] +\
 [tick.label2 for tick in axis.get_major_ticks() if tick.label=
2On]
There's a convenience function for the major labels but not for the
minor, so I do it this way for both.

Hello -
It was brought to my attention that when matplotlib is installed on win32,
the .matplotlib directory is not created in the \Documents and
Settings\username directory until matplotlib is imported once (for exampe
from pylab import *). This causes some confusion for new users in the
installation process (like the students in my class). One of the problems i=
s
that many users cannot create a directory with the name '.matplotlib', as X=
P
requires a folder to have a name, not just an extension (those MS guys...).
Can the install script be modified to create this directory (and preferably
put the matplotlibrc file in it) when matplotlib is installed?
Thanks,
Mark

>>>>> "Darren" == Darren Dale <dd...@co...> writes:
 >> Is it possible to disable this message when importing
 >> matplotlib ?
 >> 
 >> >>> import matplotlib
 >> 
 >> /usr/lib64/python2.4/site-packages/matplotlib/__init__.py:729:
 >> UserWarning: ghostscript-8.15 found. ghostscript-8.16 or later
 >> is recommended for use with the text.usetex option.
 >> warnings.warn( 'ghostscript-%s found. ghostscript-%s or later
 >> is \
 Darren> Not at present. I wanted to make this warning a call to
 Darren> verbose.report, but couldnt get it to work. The report was
 Darren> not printed. I'll look into it again this morning.
Well, since it is open source software, you can always go into that
file Nils and comment out the warning and reinstall...
JDH

On Friday 27 January 2006 6:58 am, Nils Wagner wrote:
> Is it possible to disable this message when importing matplotlib ?
>
> >>> import matplotlib
>
> /usr/lib64/python2.4/site-packages/matplotlib/__init__.py:729:
> UserWarning: ghostscript-8.15 found. ghostscript-8.16 or later is
> recommended for use with the text.usetex option.
> warnings.warn( 'ghostscript-%s found. ghostscript-%s or later is \
Not at present. I wanted to make this warning a call to verbose.report, but 
couldnt get it to work. The report was not printed. I'll look into it again 
this morning.
Darren 

Is it possible to disable this message when importing matplotlib ?
>>> import matplotlib
/usr/lib64/python2.4/site-packages/matplotlib/__init__.py:729:
UserWarning: ghostscript-8.15 found. ghostscript-8.16 or later is
recommended for use with the text.usetex option.
 warnings.warn( 'ghostscript-%s found. ghostscript-%s or later is \
Nils

Good morning,
>Could it be that you don't have numpy as your rc setting in matplotlib?
Yes, because I 've installed scipy_core, scipy and of course Numeric to get
matplotlib-0.86 working properly... So, immediately a question arises: "If I
install NumPy-0.9.4 (old embosomed name;-) ) and SciPy-0.4.4 could
matplotlib-0.86.2 work with the array interface now?"
Sorry for not following the discussions on different lists...
Cheers
Jens

I'm working on some custom graphs [1] and want the ability to vary the
label based on the content of the label. The problem is that the label
text (majorTick.label1._mytext.get_text()) doesn't get filled until
the graph is plotted. Any help would be appreciated.
[1] http://gr.ayre.st/~grayrest/custom_graph.png
I basically want 'Jan 11' and 'noon' to be highlighted. At the moment
I'm just highlighting every fourth major tick.

Christopher Barker wrote:
> Fernando Perez wrote:
> 
>>the code behind this:
>>
>>http://bayes.colorado.edu/cgi-bin/arrows/arrow_cgi.py
>>
>>(just try the mock example with the data in the page) is coming to 
>>matplotlib in a week or two.
> 
> 
> Now you tell me!
> 
> Would you be willing to send me some code sooner? I don't want to work 
> on my code more it you've already done a better job of it.
> 
> Did you make a "Collections" class. I can imagine that performance could 
> be important sometimes.
I didn't write the code, so I can't send it. I'll contact the author and let 
him know.
Cheers,
f

Has anyone implemented a nice SCATTERPLOT MATRIX
(e.g., click http://www.math.sfu.ca/~cschwarz/Stat-301/Handouts/node43.html
and tab down once for an example. Or for variants see e.g.
http://www.ncss.com/scatmatrix.html 
http://www.itl.nist.gov/div898/software/dataplot/refman1/auxillar/scatplma.htm 
http://www.mrc-bsu.cam.ac.uk/bugs/documentation/coda03/node34.html )
Thank you,
Alan Isaac

Fernando Perez wrote:
> the code behind this:
> 
> http://bayes.colorado.edu/cgi-bin/arrows/arrow_cgi.py
> 
> (just try the mock example with the data in the page) is coming to 
> matplotlib in a week or two.
Now you tell me!
Would you be willing to send me some code sooner? I don't want to work 
on my code more it you've already done a better job of it.
Did you make a "Collections" class. I can imagine that performance could 
be important sometimes.
-Chris
-- 
Christopher Barker, Ph.D.
Oceanographer
 		
NOAA/OR&R/HAZMAT (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chr...@no...

Christopher Barker wrote:
> Hi all,
> 
> I've written a little custom LineCollection class that draws a bunch of 
> arrows pointing in given directions, with their origins at a set of 
> (x,y) points. I use this type of plot to plot vector quantities varying 
> over time, like an ocean current at a point, for instance. The x-axis is 
> time, the y-axis is magnitude, and the arrow points in the direction.
the code behind this:
http://bayes.colorado.edu/cgi-bin/arrows/arrow_cgi.py
(just try the mock example with the data in the page) is coming to matplotlib 
in a week or two. I think it addresses some of the issues you're dealing 
with: it's an arrows-on-steroids class, with control over heads (including the 
half-heads shown) and more.
Cheers,
f

>>>>> "Jack" == Jack Sankey <jac...@gm...> writes:
 Jack> Hello, Is there a global figure handler, something like
_pylab_helpers.Gcf
 Jack> pylab.get_all_figures()
 Jack> that returns an array of figure instances? Right now I'm
 Jack> just using wx.GetTopLevelWindows()[n].canvas.figure
import _pylab_helpers
figures = [manager.canvas.figure for manager in _pylab_helpers.Gcf.get_all_fig_managers()]
JDH

Hello,
Is there a global figure handler, something like
pylab.get_all_figures()
that returns an array of figure instances? Right now I'm just using
wx.GetTopLevelWindows()[n].canvas.figure
Thanks,
Jack

Hi all,
I've written a little custom LineCollection class that draws a bunch of 
arrows pointing in given directions, with their origins at a set of 
(x,y) points. I use this type of plot to plot vector quantities varying 
over time, like an ocean current at a point, for instance. The x-axis is 
 time, the y-axis is magnitude, and the arrow points in the direction.
I've enclosed a PNG of a sample plot (with clearly meaningless data), 
and the code that created it.
John Hunter wrote:
> What you want to do is use a line collection,
Following John's sample code, I got it working, but I do have a few 
questions:
I'm now drawing the arrows as a LineCollection, and then drawing with 
'o' markers on top to get the circles. Is there a way to add markers 
like that to the LineCollection, so that it's a single class?
The arrow heads look a bit off. If you make them much larger, they look 
fine, but small, they're not quire right. I suspect there is some 
rounding to integers that is going on. Or maybe it's something with the 
join style? (note, I'm using GTKAgg)
The way the code is written now, I need to pass in a axes object and a 
figure object, as I need the transData attribute from the axes and the 
dpi attribute from the figure. This creates a coupling that I'm not 
happy with. It's a bit odd that I have to pass the axes into the 
constructor, then add the LineCollection to the axes again. Is there a 
way to write this so that the transOffset and transform are applied when 
the LineCollection is added to the axes, rather than ahead of time?
Also, the Figure coupling is even worse -- is there a way to discover 
what figure an axes is on from the axes itself (or get it's dpi, which 
is all I really need?)
I guess what I'm hoping exists, and suggesting if it doesn't, is that 
the scaling and all would be "lazy", like lazy Values. The transform and 
scaling wouldn't be defined until it's time to actually render the 
LineCollection. I did something like that in my FloatCanvas. Each 
DrawObject has a _Draw method that gets a "WorldToPixel" function passed 
in. This function converts world coordinates that the object is defined 
in to pixel coordinates that it needs to draw itself with. That way, the 
object can exist entirely separate from a Canvas, and need know nothing 
about how it's coordinates need to be transformed until it needs to draw 
itself. Can something like this be done in MPL?
Would this be a useful plot type to add to MPL? If so, can you suggest 
an existing class that I should imitate to define what the interface 
would look like?
thanks,
-Chris
-- 
Christopher Barker, Ph.D.
Oceanographer
 		
NOAA/OR&R/HAZMAT (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chr...@no...

>>>>> "J" == J Brandenburg <J.B...@if...> writes:
 J> Hi,
 >> r,t = ogrid[0:pi:deltatheta, 0:2*pi:deltatheta]
 J> doesn't work for me...
 J> running
 J> ------------------------------------------------------------
 J> from scipy import * from pylab import *
Could it be that you don't have numpy as your rc setting in
matplotlib? If not, you're getting the wrong names when you do 
from pylab import *
JDH

>typecode.
> 
>
This is an error from old Numeric. I'm still not sure why you are 
getting it as this works for me using old scipy. 
-Travis

Hi,
>r,t = ogrid[0:pi:deltatheta, 0:2*pi:deltatheta]
doesn't work for me...
running
------------------------------------------------------------
from scipy import *
from pylab import *
deltatheta = 2.*pi/100.
r,t=ogrid[0:pi:deltatheta, 0:2.*pi:deltatheta]
Z = sin(r)*sin(3.*t)
X = r*cos(t)
Y = r*sin(t)
figure(figsize=(8,8))
cs = contourf(X, Y, Z)
title('Simple polar contour plot')
show()
------------------------------------------------------------
Returns me the following:
Editing... done. Executing edited code...
---------------------------------------------------------------------------
exceptions.TypeError Traceback (most recent
call last)
/media/exchange/Python/bsp_polar02.py
 6 deltatheta = 2.*pi/100.
 7 r,t=ogrid[0:pi:deltatheta, 0:2.*pi:deltatheta]
----> 8 Z = sin(r)*sin(3.*t)
 9 X = r*cos(t)
 10 Y = r*sin(t)
TypeError: function not supported for the spacesaver array with the largest
typecode.
Cheers
Jens Brandenburg

>>>>> "Jerry" == Jerry He <reb...@ya...> writes:
 Jerry> Hi, When I tried to save a plot from the TkAgg GUI, it
 Jerry> gave me an error message, here's the whole sesssion
 
...snip...
 >>>> show()
One should never call 'show' from the interactive shell; see
http://matplotlib.sf.net/faq.html#SHOW
But, even considering that, I cannot replicate your bug. What
version of mpl are you using?
 Jerry> self.renderer._renderer.write_png(str(filename))
 Jerry> UnicodeEncodeError: 'ascii' codec can't encode characters
 Jerry> in position 36-37: ord inal not in range(128)
Looks like something funny with unicode -- please describe as much as
possible about your (language) environment and if possible a complete
free-standing script which replicates the bug.
Thanks!
JDH

On 25 Jan 2006, at 21:13, Eric Firing wrote:
> James Boyle wrote:
>> In the quadmesh demo the shapes of the data(Z) and the coordinates 
>> (Qx,Qz) are exactly the same (n x n).
>> Now my understanding is that what is being plotted are values in a 
>> mesh which needs (n+1,n+1) vertices to describe it.
>> If I have a mesh of quadrilaterals defined by the vertices - how 
>> can pcolormesh plot this?
>> In collections.py the comments of QuadMesh appear to be addressing 
>> the description of the vertices, how is this used by pcolormesh?
>> It is very likely something very simple I am missing but I am at a 
>> loss at present.
>> --Jim
>
>
> Jim,
>
> I think that all the pcolor-type functions and methods simply throw 
> away the last row and column of Z. This behavior is inherited from 
> Matlab. Perhaps it could be clarified (made explicit) in the 
> documentation.
This has always been a very annoying feature of matlab.
> I would also be inclined to make these functions accept a Z with 
> dimensions (m-1, n-1) for a grid with dimensions (m,n). It is 
> silly to have to tack on an extra dummy row and column just to be 
> able to use all the values in a Z array.
It really would be much more logical.
George.

When you click on the close button of a graphics window, does this
call pylab.close()?
-Jack

On Wednesday 25 January 2006 14:59, Ryan Krauss wrote:
> My guess on the first problem is that you don't have ps2eps installed.
> This is a dependency that I am not sure is checked. 
There was a bug in the function that checks for ps2eps. It is fixed in cvs. 

James Boyle wrote:
> In the quadmesh demo the shapes of the data(Z) and the 
> coordinates(Qx,Qz) are exactly the same (n x n).
> Now my understanding is that what is being plotted are values in a mesh 
> which needs (n+1,n+1) vertices to describe it.
> 
> If I have a mesh of quadrilaterals defined by the vertices - how can 
> pcolormesh plot this?
> 
> In collections.py the comments of QuadMesh appear to be addressing the 
> description of the vertices, how is this used by pcolormesh?
> 
> It is very likely something very simple I am missing but I am at a loss 
> at present.
> 
> --Jim
Jim,
I think that all the pcolor-type functions and methods simply throw away 
the last row and column of Z. This behavior is inherited from Matlab. 
Perhaps it could be clarified (made explicit) in the documentation. I 
would also be inclined to make these functions accept a Z with 
dimensions (m-1, n-1) for a grid with dimensions (m,n). It is silly to 
have to tack on an extra dummy row and column just to be able to use all 
the values in a Z array.
Other people are working on the pcolor-type functions now, so I don't 
want to barge in and make these changes, but I don't see any reason they 
can't be made once the dust settles.
Eric

In the quadmesh demo the shapes of the data(Z) and the 
coordinates(Qx,Qz) are exactly the same (n x n).
Now my understanding is that what is being plotted are values in a mesh 
which needs (n+1,n+1) vertices to describe it.
If I have a mesh of quadrilaterals defined by the vertices - how can 
pcolormesh plot this?
In collections.py the comments of QuadMesh appear to be addressing the 
description of the vertices, how is this used by pcolormesh?
It is very likely something very simple I am missing but I am at a loss 
at present.
--Jim

 D'oh! I thought I had caught all the dependencies. That did it for
the distilling, thanks. Anyone else with this problem, ps2eps can be
found at http://www.tm.uka.de/~bless/ps2eps.
On 1/25/06, Ryan Krauss <rya...@gm...> wrote:
> My guess on the first problem is that you don't have ps2eps installed.
> This is a dependency that I am not sure is checked. The output of
> this command should create an .eps file in the tmp folder you were
> looking at.
>
--
 -- Graeme
 gra...@gm...

My guess on the first problem is that you don't have ps2eps installed.
 This is a dependency that I am not sure is checked. The output of
this command should create an .eps file in the tmp folder you were
looking at.
Try typing ps2eps -v at a command prompt and see if you have it. You
also need ps2pdf and pdftops, but if the message is complaining about
an eps file, ps2eps is likely the problem. I think these commands are
mainly ghostscript wrappers, but I am not sure.
Ryan
On 1/25/06, Graeme Lufkin <gra...@gm...> wrote:
> I'm quite excited about usetex; it looks like exactly what I want.
> I'm using matplotlib 0.86.2, dvipng 1.7, xpdf 3.00 and
> gnu-ghostscript-8.16. I've got two issues.
> First, I tried setting ps.usedistiller to xpdf, and got the error
> 'file not found: ~/tmp/<long hash here>.eps'. If I look, a '.ps' file
> is there, which is probably what the distilling process means. Help?
> Second: In the script below, I've edited tex_demo.py to reveal two
> bugs. First, if I don't specify the right size axes, the top plot
> label gets cut off, presumably because the height of the latex
> fragment isn't calculated right or something. Second, I've increased
> the amplitude of the function, making the y-axis ticks integral. With
> this change, the y axis ticks are now back in the default matplotlib
> font, instead of Computer Modern as when they were between 0 and 2.
> Not sure how this could happen.
> Thanks for your great work so far.
>
> tex_demo.py:
> rc('text', usetex=3DTrue)
> #figure(1)
> #ax =3D axes([0.1, 0.1, 0.8, 0.7])
> t =3D arange(0.0, 1.0+0.01, 0.01)
> s =3D 50 * cos(2*2*pi*t)+50
> plot(t, s)
>
> xlabel(r'\bf{time (s)}')
> ylabel(r'\it{voltage (mV)}',fontsize=3D16)
> title(r"\TeX\ is Number
> $\displaystyle\sum_{n=3D1}^\infty\frac{-e^{i\pi}}{2^n}$!",
> fontsize=3D16, color=3D'r')
> grid(True)
> savefig('tex_demo')
> show()
>
> --
> -- Graeme
> gra...@gm...
>
>
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