matplotlib-users Mailing List for matplotlib

FYI, here's what they're saying about us on the debian-science list 
about us right now.

-------- Original Message --------
Subject: Re: python matplotlib debian package
Resent-Date: Wed,  5 Oct 2005 14:59:45 -0500 (CDT)
Resent-From: deb...@li...
Date: Wed, 5 Oct 2005 14:59:40 -0500 (CDT)
From: Carlo Segre <se...@ii...>
Reply-To: Carlo Segre <se...@ii...>
To: JD Rogers <jdr...@em...>
CC: deb...@li...
References: <20051005155900.GA10519@brancaleone> 
<Pin...@ox...> 
<839...@ma...>


Here is the answer I got.


Date: Wed, 05 Oct 2005 13:08:45 -0500
From: Ken McIvor <mc...@ii...>
To: Carlo Segre <se...@ii...>
Subject: Re: python matplotlib debian package (fwd)

On Oct 5, 2005, at 12:24 PM, Carlo Segre wrote:
>do you know the answer to this as you talk with the matplotlib guys.

Once matplotlib hits 1.0 there will be a concerted effort to get it into
Debian.  It's still under such heavy development that it's a bit of a
moving
target right now.

Ken



On Wed, 5 Oct 2005, JD Rogers wrote:

> Haha, that was fun. Talk about a quick answer(s). :-)
> On a related note, does anyone know the plan for bringing matplotlib
> into debian proper? There are still some sites pointing to the
> mentors.debian.net site which made me think someone was working on
> becoming a maintainer. It took me a few minutes to realize that is an
> unofficial debian site.
>
> On 10/5/05, Carlo Segre <se...@ii...> wrote:
>>
>> Dear Andrea:
>>
>> The packages can be obtained at
>>
>> # Matplotlib binaries
>> deb http://anakonda.altervista.org/debian packages/
>> deb-src http://anakonda.altervista.org/debian sources/
>>
>> Cheers,
>>
>> Carlo
>>
>>
>> On Wed, 5 Oct 2005, Andrea De Michele - wrote:
>>
>>> Hi all,
>>> I'm interesting in python plotting libraries.
>>> matplotlib seems quite interesting, but I'm not able to install it on
>>> my computer.
>>> There is a deb package for this python module?
>>> bye
>>> adm.
>>>
>>
>> --
>> Carlo U. Segre -- Professor of Physics
>> Associate Dean for Special Projects, Graduate College
>> Illinois Institute of Technology
>> Voice: 312.567.3498            Fax: 312.567.3494
>> Car...@ii...    http://www.iit.edu/~segre
>>
>>
>> --
>> To UNSUBSCRIBE, email to deb...@li...
>> with a subject of "unsubscribe". Trouble? Contact lis...@li...
>>
>>
>
>

-- 
Carlo U. Segre -- Professor of Physics
Associate Dean for Special Projects, Graduate College
Illinois Institute of Technology
Voice: 312.567.3498            Fax: 312.567.3494
Car...@ii...    http://www.iit.edu/~segre

Smith, Frank wrote:

>Help!. I'd like to show traditional "lesser-than-or-equal" and
>"greater-than-or-equal" symbols in a title or label fields but can't
>find anything in the documentation and I've tried a number of guesses
>but to no avail. Given the range of mathematical expressions that
>matplot can support I'm sure there is something better than "<=". Thanks
>in advance.
>Frank
>
>
>  
>
Frank:

Try this:

 >>> from pylab import *
 >>> plot([1,2,3])
 >>> title(u'\N{GREATER-THAN OR EQUAL TO}')
 >>> show()


-Jeff

-- 
Jeffrey S. Whitaker         Phone  : (303)497-6313
Meteorologist               FAX    : (303)497-6449
NOAA/OAR/CDC  R/CDC1        Email  : Jef...@no...
325 Broadway                Office : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web    : http://tinyurl.com/5telg

On Wed, 2005-10-05 at 15:32 -0400, Smith, Frank wrote:
> Help!. I'd like to show traditional "lesser-than-or-equal" and
> "greater-than-or-equal" symbols in a title or label fields but can't
> find anything in the documentation and I've tried a number of guesses
> but to no avail. Given the range of mathematical expressions that
> matplot can support I'm sure there is something better than "<=". Thanks
> in advance.

You can use the \leq latex symbol when using either the mathtext module.
See the screenshots page for a demo of it.

http://matplotlib.sourceforge.net/screenshots/mathtext_demo.py
http://matplotlib.sourceforge.net/screenshots/mathtext_demo_large.png

Also, this page contains a list of latex math symbols.
http://www.fi.uib.no/Fysisk/Teori/KURS/WRK/TeX/symALL.html

Regards,
John

--
John Byrnes (by...@bu...)
Graduate Student
Electrical Engineering
Boston University

To obtain a man's opinion of you, make him mad.
		-- Oliver Wendell Holmes

Help!. I'd like to show traditional "lesser-than-or-equal" and
"greater-than-or-equal" symbols in a title or label fields but can't
find anything in the documentation and I've tried a number of guesses
but to no avail. Given the range of mathematical expressions that
matplot can support I'm sure there is something better than "<=3D". =
Thanks
in advance.
Frank

On 05 Oct, 2005, at 09:25, Nicholas Young wrote:

>
> There's a patch from me on the devel list from sometime ago which
> contains a patch to add an arrowhead marker style to lines.  This
> obviously isn't a solution but on the off chance its useful its here:
> http://sourceforge.net/mailarchive/message.php?msg_id=12411835
>

So to apply the patch I can manually edit lines.py
or can I just write my own function. I am not familiar with renderer.

Also your patch mentions a patch.arrow class. Where is that documented?

Hi all,

I've been trying to put my pie-chart into a nice layout. More
specifically, I am wondering whether it is possible to place a label
completely outside the wedges of a pie-chart? My current labels are half
written on top of the pie wedges.

Thanks in advance for any pointers.
Dominik

I'm having trouble compiling 0.84 on Python 2.4 / Ubuntu Hoary (5.04).
It seems like when GCC tries to build ft2font it can't find the two
files referenced in CXX/extensions.hxx and CXX/objects.hxx.

Here are the beginning of the error messages:

(Plenty of things were compiled correctly before this so they don't show up=
):

running build
running build_py
running build_ext
building 'matplotlib.ft2font' extension
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -O3 -Wall
-Wstrict-prototypes -fPIC -I/usr/local/include -I/usr/include
-I/usr/local/include/freetype2 -I/usr/include/freetype2
-I/usr/local/include/python2.4 -c src/ft2font.cpp -o
build/temp.linux-i686-2.4/src/ft2font.o
In file included from src/ft2font.cpp:2:
src/ft2font.h:18:30: CXX/Extensions.hxx: No such file or directory
src/ft2font.h:19:27: CXX/Objects.hxx: No such file or directory
In file included from src/ft2font.cpp:2:
src/ft2font.h:35: error: `Py' is not a class or namespace
src/ft2font.h:35: error: no class template named `PythonExtension' in `Py'
src/ft2font.h:35: error: invalid base-class specification
src/ft2font.h:39: error: parse error before `::' token
src/ft2font.h:40: error: syntax error before `::' token
src/ft2font.h:43: error: syntax error before `::' token

The error messages then scroll off into a world of pain.

I have the default Ubuntu libfreetype2.1.7 installed, and installed
2.1.10 from source (but this problem was identical before I installed
2.1.10 from source). I have no idea if this matters.

I installed (through apt) python-cxx, but this didn't seem to change anythi=
ng.

This seems like a completely trivial problem (especially compared to
the other frutrations I have had with matplotlib in the past), but I
don't know how to fix it...

Any assitance appreciated.

-Chris Mutel

On Wed, 2005-10-05 at 09:43 -0500, John Hunter wrote:
> I need to plot vectors along a manifold (curve). The quiver plot
> AFAI can tell only plots arrows on a grid not just
> along a curve. In general I need a scatter plot where each plotted
> point is a vector.  where (x,y) is the base of vector
> and (u,v) is the vector. The plot could take in arrays  X Y U V
> where as in the quiver plot X Y U V are matrices.
> 
> Anyone have any suggestions how I might go about generating such a
> plot even if I have to do it by repurposing something else.
> In general how would I position an arbitrary arrow somewhere on a
> plot?

There's a patch from me on the devel list from sometime ago which
contains a patch to add an arrowhead marker style to lines.  This
obviously isn't a solution but on the off chance its useful its here:
http://sourceforge.net/mailarchive/message.php?msg_id=12411835

Nick

Sam Smith is having trouble posting to the list, so I'm posting this
form him

From: "Samuel M. Smith" <sm...@sa...>
Date: 04 October, 2005 22:52:57 MDT
To: mat...@li...
Cc: "Samuel M. Smith" <sm...@sa...>
Subject: Plotting vectors (arrows) on a manifold


I need to plot vectors along a manifold (curve). The quiver plot
AFAI can tell only plots arrows on a grid not just
along a curve. In general I need a scatter plot where each plotted
point is a vector.  where (x,y) is the base of vector
and (u,v) is the vector. The plot could take in arrays  X Y U V
where as in the quiver plot X Y U V are matrices.

Anyone have any suggestions how I might go about generating such a
plot even if I have to do it by repurposing something else.
In general how would I position an arbitrary arrow somewhere on a
plot?

I suppose I could brute force it by superimposing 3 line plots for
each arrow where each plot draws one part of the arrow ( body, left
head, right head). This amounts to a lot of plots. Is there a
better way?

What would also be useful is a combination of a comet plot with an
arrow pointing in the direction the comet is moving.
This would be great for animation.


**********************************************************************
Samuel M. Smith Ph.D.
2966 Fort Hill Road
Eagle Mountain, Utah 84043
801-768-2768 voice
801-768-2769 fax
**********************************************************************
"The greatest source of failure and unhappiness in the world is
giving up what we want most for what we want at the moment"
**********************************************************************

>>>>> "Robert" == Robert Kern <rk...@uc...> writes:

    Robert> I guess I should officially submit this as a patch:

    Robert> http://article.gmane.org/gmane.comp.python.matplotlib.general/3272/

Added to CVS -- thanks.

Checking in lib/matplotlib/texmanager.py;
/cvsroot/matplotlib/matplotlib/lib/matplotlib/texmanager.py,v  <--
texmanager\
.py
new revision: 1.28; previous revision: 1.27
done

JDH

>>>>> "Erik" == Erik Curiel <ec...@ke...> writes:

    Erik> incredibly simple, anyway).  After two solid days of
    Erik> commenting this and that out, recompiling everything and its
    Erik> mother 76 different ways from Sunday, poring over a legion
    Erik> of Solaris sys includes, slaughtering a few spotlessly white
    Erik> lambs and one pure black sheep, wrapping the bones and

This information is incredibly helpful -- please do make a wiki entry.

    Erik> There is one remaining item I find extremely puzzling about
    Erik> the whole affair, though.  Since I don't have a recent
    Erik> glib/gtk+ library installed, and didn't want to make more
    Erik> hoops for myself to jump through, I attempted to build
    Erik> muhpuhbuh without gtk+ support.  Nothing I did would get it
    Erik> to build without gtk+ support, though.  I finally commented
    Erik> out every line in setup.py and setupext.py that had anything
    Erik> to with gtk+ (the variables BUILD_GTKAGG, BUILD_GTK, etc.,
    Erik> the conditional code-blocks if BUILD_GTK:, if BUILD_GTKAGG:,

This is totally normal.  All the backend_gtk*.py files will be
installed regardless of your setup.py settings.  Don't go to any
heroics in that file (eg trying to comment out the build_* funcs as
you did).  Just set the advertised flags (eg BUILD_GTKAGG flag).  This
will affect what *extension code* gets compiled, but not what python
files get installed.  

Your problem is that you failed to heed my somewhat cryptic advice at
the end of my last post, particularly the bit at the end that I
reproduce here

  Another lurking gotcha along these lines is the backend setting.

    backend      : GTKAgg     # the default backend
    numerix      : Numeric    # Numeric or numarray

  As with numerix, the backend setting requires you have the
  appropriate GUI toolkit installed (eg pygtk) often at compile time
  if you want to use a GUI.  If you are only doing offline image
  production you can make the backend Agg.  See also

    http://matplotlib.sf.net/backends.html.

The basic point which I failed to make clear is that the *runtime
configuration* is independent of the *compile time* configuration.
Yes, this is suboptimal but it is.  So you need to change the default
backend which is chosen at runtime in your rc file, as described in
http://matplotlib.sf.net/matplotlibrc.  Clear?

matplotlib / pylab does a lot of magic under the hood.  In the best of
circumstances, it "just works".  Obviously based on your experience we
have a ways to go before this mantra actually holds.  One way to tease
apart what mpl is doing under the hood is to create a simple test
script like

  from pylab import plot, show
  plot([1,2,3])
  show()

and run it with

  > python myscript --verbose-helpful

This will show you what rc file is being parsed, what backend is set,
what your numerix setting is, and so forth.

Good luck!
JDH

Dev Gorur wrote:
> Hello,
> 
> I am able to use tex in matplotlib, and it works fine. However, I would
> like to make the default font Helvetica, which is the sans-serif font in
> the latex package times. Of course, I can achieve this effect by putting
> \sf at the beginning of *every* text string. Is there a better way? I
> tried the following:
> --------------------------------------
> from matplotlib import rc
> from matplotlib.font_manager import *
> from pylab import *
> import string
> 
> rc('text', usetex=True)
> 
> f = FontProperties()
> f.set_family('sans-serif')
> f.set_name(['Helvetica'])
> 
> <some plot commands>
> title('Test latex')
> ---------------------------------------
> As expected, this doesn't work - it retains serif as the default tex
> font. Is there a way to change the default tex font?

I guess I should officially submit this as a patch:

http://article.gmane.org/gmane.comp.python.matplotlib.general/3272/

-- 
Robert Kern
rk...@uc...

"In the fields of hell where the grass grows high
 Are the graves of dreams allowed to die."
  -- Richard Harter

Hello,

I am able to use tex in matplotlib, and it works fine. However, I would lik=
e
to make the default font Helvetica, which is the sans-serif font in the
latex package times. Of course, I can achieve this effect by putting \sf at
the beginning of *every* text string. Is there a better way? I tried the
following:
--------------------------------------
from matplotlib import rc
from matplotlib.font_manager import *
from pylab import *
import string

rc('text', usetex=3DTrue)

f =3D FontProperties()
f.set_family('sans-serif')
f.set_name(['Helvetica'])

<some plot commands>
title('Test latex')
---------------------------------------
As expected, this doesn't work - it retains serif as the default tex font.
Is there a way to change the default tex font?

Regards,
Dev