matplotlib-users Mailing List for matplotlib

Hi all,

Just a quick question for the guru's out there.  I'm working on a  
project that includes lots
of plotting.  We'd like to be able to do the plots through a C/C++  
interface but I've been
unable to find any documentation on it.

Does anyone know where I can find any docs on the C interface?

Thanks

Shannon
--------------------------------
Shannon Jaeger
SB 532B, Dept. of Physics & Astronomy - ALMA
University of Calgary, 2500 University Dr, Calgary, AB, T2N 1N4
sdj...@uc...
+1 403 210 8495

Hi Mike,

On Tuesday 23 October 2007 09:05:56 am Michael Droettboom wrote:
> Unfortunately, I can't reproduce this on my machine even with the latest
> stable version of freetype-2.5.3 (which is the same version in Ubuntu
> Gutsy).

I think you mean freetype-2.3.5. I also have that version installed, althou=
gh=20
the mpl setup script is reporting 9.16.3.

> The Ubuntu/Debian package of freetype has a lot of patches=20
> applied, and I don't know if they are causing this (but from the looks
> of them, I doubt it).
>
> Can you set debug.verbose to "annoying" and send me the output of your
> matplotlib run?  I want to rule out any font-loading problems.

It's attached. I'm running 64bit gentoo, everything compiled with gcc-4.2.2=
,=20
in case its relevent.

Darren

> Michael Droettboom wrote:
> > I can't reproduce this bug on my own machine with SVN head.  I suspect
> > this is freetype2 related -- that's the library that actually performs
> > the rendering of the characters for the Agg backend.  The fact the
> > humufr saw this after upgrading to Gutsy suggests there might have been
> >   change to freetype that is now revealing possibly an incorrect usage
> > in matplotlib.  Can you please send the version of freetype you are
> > using?  (pkg-config --modversion freetype2)
> >
> > My machine has the (fairly old) 2.1.9.
> >
> > I'm going to try installing the latest freetype and see if I can
> > reproduce this bug.
> >
> > [I believe this is an instance of the same bug that Darren sent me
> > off-list.]
> >
> > Cheers,
> > Mike
> >
> > hu...@ya... wrote:
> >> Sorry I didn't know the difference...
> >>
> >> N.
> >>
> >> Le Friday 19 October 2007 10:52:25 Darren Dale, vous avez =E9crit :
> >>> On Friday 19 October 2007 10:38:36 am hu...@ya... wrote:
> >>>> Le Friday 19 October 2007 08:37:00 Darren Dale, vous avez =E9crit :
> >>>>> On Thursday 18 October 2007 11:49:50 am hu...@ya... wrote:
> >>>>>> 	Hi,
> >>>>>>
> >>>>>> I have a small problem with label.
> >>>>>>
> >>>>>>
> >>>>>> plot([0,1],[0,1])
> >>>>>> xlabel(r'$ABCDEF$',fontsize=3D35)
> >>>>>>
> >>>>>> (but the size doesn't change anything) I obtain the result visible
> >>>>>> on the figure join. I think there are a problem when using latex a=
nd
> >>>>>> how the first character is handle.
> >>>>>
> >>>>> I don't think its a problem with matplotlib; I can't reproduce the
> >>>>> problem on my machine. Maybe its an issue with your dvipng? I'm usi=
ng
> >>>>> version 1.9.
> >>>>
> >>>> Oups I found the problem, I don't know why because it was working fi=
ne
> >>>> before the upgrade to gutsy but I have to change matplotlib
> >>>> configuration and everything is working fine if I put in the file:
> >>>>
> >>>> rc('text', usetex=3DTrue)
> >>>
> >>> In your first email you said you were using latex, but you were
> >>> actually using mathtext. I can confirm the problem when I disable
> >>> usetex and instead use mathtext. Mike, is this something easy to fix?
> >>>
> >>> Darren
> >>
> >> ----------------------------------------------------------------------=
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=2D-=20
Darren S. Dale, Ph.D.
Staff Scientist
Cornell High Energy Synchrotron Source
Cornell University
275 Wilson Lab
Rt. 366 & Pine Tree Road
Ithaca, NY 14853

dar...@co...
office: (607) 255-3819
fax: (607) 255-9001
http://www.chess.cornell.edu

On Thu, 18 Oct 2007 21:10:24 -1000
Eric Firing <ef...@ha...> wrote:

> Christian Lerrahn wrote:
> > Hi,
> > when I plot 2D data with imshow() and then add a contour plot, my
> > contours have an offset in relation to the data. At the same time
> > there is white space at the edge of my plot, so I assume that it is
> > the imshow plot that actually gets shifted. I'm new to Python and
> > matplotlib, so I don't really understand that. Can anybody give me a
> > hint about how to get rid of this offset?
> 
> In the examples subdirectory of the mpl distribution, see
> contour_image.py.

Thanks. With the example and a bit of try and error, I now got it to
work. :)

Cheers,
Christian

Hi,
I sometimes get the error

Warning: overflow encountered in short_scalars

when I'm trying to plot certain data. When I searched a bit what I
could find on this problem, I came across

http://projects.scipy.org/pipermail/numpy-discussion/2007-May/027933.html

At least in one case where I had the problem, the claim there that it
has to do with too many values being to close to the highest value
possible in Int16 is right for my data. However, I'm not sure if it
always applies when that error occurs.

Can anybody tell me how to work around this and still get valid plots
with this kind of data?

Cheers,
Christian

On Thursday 11 October 2007 17:41, Stephen George wrote:
> Hi Joshua,
>
> > As you can see from the attached graph, there is a break the in graph
> > somewhere around 7 AM or so.  This is the data I am graphing for that red
> > line:
> >
> > "2007-10-09 00:00:00",0.015
> > "2007-10-09 01:00:00",0.015
> > "2007-10-09 02:00:00",0.014
> > "2007-10-09 03:00:00",0.012
> > "2007-10-09 04:00:00",0.008
> > "2007-10-09 05:00:00",0.002
> > "2007-10-09 06:00:00",-0.006
>
> <snip>
>
> > If I change the -0.006 at 6:00AM to 0.006, it graphs with no break in the
> > line.
>
> Can not comment on Matplotlib, ... but what method are you using the
> process your input?
> RegEx or other ?, can it handle negative input?

Sigh...it wasn't matplotlib after all.  Being very unfamiliar with the code I 
was exploring, I failed to notice that there was a function filtering data, 
and clipping it at 0.00.  Change it, and all is well.  Just FYI.

j

-- 
Joshua Kugler                           
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