matplotlib-users Mailing List for matplotlib

2013年1月9日 Goyo <goy...@gm...>:
> I'm using matplotlib master from
> https://launchpad.net/%7Etakluyver/+archive/matplotlib-daily, ubuntu
> 12.10 and python 2.7 and sometimes I get misplaced y labels for twinx
> plots. I file a bug at github with a sample script and figure images:
> https://github.com/matplotlib/matplotlib/issues/1608
> A guy commented there saying he can't replicate the issue. I wonder if
> anyone using ubuntu 12.10 can try my code with the matplotlib version
> from that repo and share the output.
>
Follow up: there's a PR for an older bug which works for me:
https://github.com/matplotlib/matplotlib/issues/1608#issuecomment-12071708

Since this is specific to Windows 8, I wonder if the Arial font has been 
updated in that version. If it's a newer OTF font, rather than a TTF 
font, it's possible matplotlib can't read it correctly.
You can see what font file is on each platform by starting up a Python 
prompt and doing:
 >>> from matplotlib import font_manager
 >>> font_manager.findfont("Arial")
It should display the path to the font. From that, you should be able 
to get the Arial file on each of your platforms and see if they are 
different. To get more details, you could open them up in the open 
source "fontforge" tool. Sorry I can't do this myself, as I don't have 
access to anything past XP.
If the fonts turn out to be different, as a workaround, you could try 
backing up and then replacing the Arial font on your Windows 8 machine 
with the one on your Windows 7 machine.
Cheers,
Mike
On 01/09/2013 11:59 PM, Paul Hobson wrote:
> Sounds like it might have something to do with your Latex installation 
> (if any) or the barebones Latex-rendering done by MPL alone. Namely, 
> they simply don't have the characters for mathematical Arial available.
>
> Not too sure though. Hopefully someone more knowledgeable responds.
> -paul
>
>
> On Tue, Jan 8, 2013 at 9:31 PM, CAB <ca...@ya... 
> <mailto:ca...@ya...>> wrote:
>
> Hi, All,
>
> I am encountering a thorny problem when trying to run matplotlib
> under Windows 8. If I label an axis using a command like
>
> ax.set_ylabel(r'time (s)', name='Arial'),
>
> all is well. But if try to add mathtext to that, as in
>
> ax.set_ylabel(r'time ($s$)', name='Arial'),
>
> mathtext.py throws an error (a very long stream) ending in
> "RuntimeError: Face has no glyph names". If I remove the
> "name='Arial'" above and let the program default to Bitstream Vera
> Sans, the mathtext works.
>
> This problem does not occur under Windows 7 or XP; only under two
> different Windows 8 installations. Any ideas what's going on?
>
> Chad
>
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Yes, you are absolutely correct. I did not realize that I did not actually evaluate the function over a grid, makes sense that interpolation fails. I thought that since I created the two axis vectors the function evaluation occurs over the entire domain, meshgrid is what I was missing.
thanks,
Shahar
On Jan 9, 2013, at 8:45 PM, Ian Thomas wrote:
> On 9 January 2013 09:32, Shahar Shani-Kadmiel <ka...@po...> wrote:
> Hi,
> 
> I'm trying to contour some data that I have and the griddata line fails. I tried running it on some synthetically generated data and I get the same IndexError. Any Ideas?
> 
> Here is the example with the synthetic data:
> 
> x = y = arange(-10,10,0.01)
> 
> z = x**2+y**3
> 
> xi = yi = linspace(-10.1, 10.1, 100)
> 
> zi = griddata(x, y, z, xi, yi)
> ---------------------------------------------------------------------------
> IndexError Traceback (most recent call last)
> <ipython-input-52-0458ab6ea672> in <module>()
> ----> 1 zi = griddata(x, y, z, xi, yi)
> 
> /Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/mlab.py in griddata(x, y, z, xi, yi, interp)
> 2766 xi,yi = np.meshgrid(xi,yi)
> 2767 # triangulate data
> -> 2768 tri = delaunay.Triangulation(x,y)
> 
> Hello Shahar,
> 
> I think that your simple example is probably not what you intended. Your (x,y) points are all defined on the straight line from (-10,-10) to (10,10). The Delaunay triangulation of these points (which is what griddata does) is not very interesting! Perhaps you wanted (x,y) defined on the 2D grid from (-10,-10) to (10,10), in which case you should follow the x = y ... line with, for example:
> x, y = meshgrid(x, y)
> (see numpy.meshgrid for further details).
> 
> You may still obtain the same IndexError, and the traceback shows this is happening in the delaunay.Triangulation function call. The matplotlib delaunay package is not particularly robust, and can have problems handling regularly-spaced data points. The griddata documentation explains some of this, see http://matplotlib.org/api/mlab_api.html#matplotlib.mlab.griddata.
> 
> To avoid the problem, the griddata documentation explains one possible way that uses the natgrid algorithm. A simpler solution that I often use is to add a very small amount of noise to my regularly-spaced (x,y) points using the numpy.random module. I can give more details if you wish.
> 
> Ian

http://krishnacement.com/boycharityleemacdonald/

Sounds like it might have something to do with your Latex installation (if
any) or the barebones Latex-rendering done by MPL alone. Namely, they
simply don't have the characters for mathematical Arial available.
Not too sure though. Hopefully someone more knowledgeable responds.
-paul
On Tue, Jan 8, 2013 at 9:31 PM, CAB <ca...@ya...> wrote:
> Hi, All,
>
> I am encountering a thorny problem when trying to run matplotlib under
> Windows 8. If I label an axis using a command like
>
> ax.set_ylabel(r'time (s)', name='Arial'),
>
> all is well. But if try to add mathtext to that, as in
>
> ax.set_ylabel(r'time ($s$)', name='Arial'),
>
> mathtext.py throws an error (a very long stream) ending in "RuntimeError:
> Face has no glyph names". If I remove the "name='Arial'" above and let the
> program default to Bitstream Vera Sans, the mathtext works.
>
> This problem does not occur under Windows 7 or XP; only under two
> different Windows 8 installations. Any ideas what's going on?
>
> Chad
>
>
> ------------------------------------------------------------------------------
> Master Java SE, Java EE, Eclipse, Spring, Hibernate, JavaScript, jQuery
> and much more. Keep your Java skills current with LearnJavaNow -
> 200+ hours of step-by-step video tutorials by Java experts.
> SALE 49ドル.99 this month only -- learn more at:
> http://p.sf.net/sfu/learnmore_122612
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>