matplotlib-users Mailing List for matplotlib (Page 14)

Hi,

I got the following error when clearing and plotting on the same
figure for many times. I found the following minimum code to reproduce
this error. I am using matplotlib-0.91.1 and wxpython2.8 on windows
xp. In the matplotlibrc file, I changed the backend to WXAgg and
interactive to True.

import pylab
def test(n):
    for i in range(n):
        f=pylab.figure(1)
        f.clf()
        a=f.add_axes([0.2, 0.2, 0.6, 0.6])
        a.plot([1,2,3,4,5], 'ro')


The error only happens for a large n. For example, test(10) works
fine, but test(50) will cause the error. Also runing test(10) for a
few times will also cause the error.

Could anyone give me some help?

Thanks.

The following is the error message:

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "<input>", line 3, in test
  File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 191, in figure
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_wx.py",
line 1227, in draw_if_interactive
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 61, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 380, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\figure.py", line 612, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\axes.py", line 1344, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\axis.py", line 596, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\axis.py", line 170, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 775, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 317, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 195,
in _get_layout
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 234, in get_text_width_height_descent
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 301, in _get_agg_font
RuntimeError: Could not open facefile
C:\Python25\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf;
Cannot_Open_Resource

Xavier Gnata wrote:
>=20
> Hi,
>=20
> Quoting  matplotlib/__init__.py :
>=20
> def checkdep_ghostscript():
>     try:
>         if sys.platform =3D=3D 'win32':
>             command =3D 'gswin32c -v'
>         else:
>             command =3D 'gs -v'
>         stdin, stdout =3D os.popen4(command)
>         line =3D stdout.readlines()[0]
>         v =3D line.split()[2]
>         vtest =3D '.'.join(v.split('.')[:2]) # deal with version numbers=
=20
> like '7.07.1'
>         float(vtest)
>         return vtest
>     except (IndexError, ValueError):
>         return None
>=20
> It fails on debian sid because 'gs -v' returns "GPL Ghostscript SVN=20
> PRE-RELEASE 8.61 (2007-08-02)\n"
>=20
> Anyway, the parser will be ugly because it has to deal with version=20
> numbers like '7.07.1'.
> Should I propose a trivial patch to get thinks working on debian sid ?
>=20
> Xavier
> ps :Why is there no standard way (like -v or --version) on *unix to get=
=20
> the version *number*?? Only the version number. Why :(
>=20
> --=20
> ############################################
> Xavier Gnata
> CRAL - Observatoire de Lyon
> 9, avenue Charles Andr=C3=A9
> 69561 Saint Genis Laval cedex
> Phone: +33 4 78 86 85 28
> Fax: +33 4 78 86 83 86
> E-mail: gn...@ob...
> ############################################=20
>=20
>=20
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2005.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
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> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>=20
>=20

Yeah , I did face the same problem . My code is following:=20
There seems to be something wrong in "ax.imshow(im)", I can't get the answe=
r
, Can sb help me .=20
The error message"ValueError: need more than 0 values to unpack"
Thank you .

# -*- coding:gb2312 -*-=20
import wx
from pylab import *
from matplotlib.backends.backend_wx import FigureCanvasWx
from matplotlib.figure import Figure
from matplotlib.axes import *
from numpy import *

#-------------------------------------------------------------
x=3Darray(range(0,100))
y=3Darray(range(0,100))
z=3Drand(100,100)
figure(1)
im=3Dimshow(z, interpolation=3D'bilinear', origin=3D'lower',cmap=3Dcm.gray,
extent=3D(0,100,0,100))
levels =3D arange(0.3, 0.4, 0.9)
contour(x,y,z,levels,origin=3D'lower',linewidths=3D2,extent=3D(0,100,0,100)=
)


fig=3Dfigure(2)
ax =3D fig.add_subplot(111)
ax.imshow(im)
ax.set_xlim(0,3)
ax.set_ylim(0,2)
show()






--=20
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%3A-gs-version-parsing-problem-tf4821980.html#a14114656
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Hi All,

I'm running into the following error when I try to run any of the matplotlib
examples:

$ python anim.py
Traceback (most recent call last):
  File "anim.py", line 19, in <module>
    import pylab as p
  File "C:\Python25\Lib\site-packages\pylab.py", line 1, in <module>
    from matplotlib.pylab import *
  File "C:\Python25\Lib\site-packages\matplotlib\pylab.py", line 206, in
<module>
    from matplotlib.numerix import npyma as ma
  File "C:\Python25\Lib\site-packages\matplotlib\numerix\__init__.py", line
20, in <module>
    from matplotlib import rcParams, verbose
ImportError: cannot import name rcParams

I'm using the latest versions of matplotlib and numpy, ActivePython 2.5 (all
for Windows XP).  Any help would be appreciated.

Regards,
Brian.

The following run well . But I just want to make the image, with the x and y
as axis and z as the image value ,show on the figure. In the pylab , we can
just give a command "imshow" ,But here , I fail to do it , I have try
ax.imshow() again and again ,but fail. Can sb give me some advice . Thank
you . 


import matplotlib 
matplotlib.use("WXAgg") 
matplotlib.interactive(True) 
from matplotlib.backends.backend_wx import FigureCanvasWx 
from matplotlib.figure import Figure 
from matplotlib.axes import * 
from numpy import * 
import wx 
from pylab import * 
    
#--------------------------------------------------- 

class DynamicPlot(): 
    def __init__(self,Frame): 
        delta = 0.025 
        x = arange(-3.0, 3.0, delta) 
        y = arange(-2.0, 2.0, delta) 
        X, Y = meshgrid(x, y) 
        Z1 = bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0) 
        Z2 = bivariate_normal(X, Y, 1.5, 0.5, 1, 1) 
        Z = 10.0 * (Z2 - Z1)       
        levels = arange(-1.2, 1.6, 0.2)       
        self.fig = Figure((8,8), 75) 
        self.canvas = FigureCanvasWx(Frame, -1, self.fig) 
        ax=self.fig.add_axes([0.1,0.1,0.8,0.8]) 
       
ax.contour(X,Y,Z,levels,origin='lower',linewidths=2,extent=(-3,3,-2,2)) 
app = wx.PySimpleApp() 
f=wx.Frame(None,size=(600,600)) 
f.Show(True) 
DynamicPlot(f) 
app.MainLoop()
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Hi.  I installed matplotlib and get the following when I import pylab:

In [8]: import pylab
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)

C:\Documents and Settings\luke\Desktop\<ipython console> in <module>()

C:\Python25\Lib\site-packages\pylab.py in <module>()
----> 1 from matplotlib.pylab import *
      2 import matplotlib.pylab
      3 __doc__ = matplotlib.pylab.__doc__

C:\Python25\Lib\site-packages\matplotlib\pylab.py in <module>()
    204 # replace the present numpy.ma implementation in a future
    205 # numpy release.
--> 206 from matplotlib.numerix import npyma as ma
    207
    208 from matplotlib import mpl  # pulls in most modules

C:\Python25\Lib\site-packages\matplotlib\numerix\__init__.py in <module>()
     18
     19 import sys, os, struct
---> 20 from matplotlib import rcParams, verbose
     21
     22 which = None, None

ImportError: cannot import name rcParams

Any ideas?  I searched and found one hit, but no solution...
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I don't know if this was peculiar to my set-up but others might find 
this useful.

I recently installed Matplotlib 0.90.1 from source on a G4 Powerbook 
and a dual G5 PowerMac, both running OSX 10.5.1. Installation 
proceeded smoothly and once the by now well documented  python path 
issue had been fixed, Matplotlib imported and ran fine with the Agg 
back-end.

However, attempting to use TkAgg led to allocation error somewhere 
deep in Tcl. I finally traced this to the fact that I had a legacy 
version of the Tcl and Tk frameworks in /Library/Frameworks. These 
were being used in preference to the Leopard installed frameworks in 
/System//Library/Frameworks. Removing the /Library/Frameworks solved 
these problems.

J.