matplotlib-users Mailing List for matplotlib

Hi, 

I have a Macbook with OS 10.6.6 with a fink installation and am still using python 2.5.5.  I installed matplotlib 1.0.0. The backend is Tkagg.  

Trying to start a plot causes a crash of the python shell as follows: 

bash-3.2$ python2.5
Python 2.5.5 (r255:77872, Mar 27 2011, 11:08:21) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import pylab
>>> get_backend()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'get_backend' is not defined
>>> pylab.get_backend()
'TkAgg'
>>> ion()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'ion' is not defined
>>> pylab.ion()
>>> fig1 = pylab.figure(1)
Exception in Tkinter callback
Traceback (most recent call last):
  File "/sw/lib/python2.5/lib-tk/Tkinter.py", line 1414, in __call__
    return self.func(*args)
  File "/sw/lib/python2.5/site-packages/matplotlib/backends/backend_tkagg.py", line 248, in resize
    self.show()
  File "/sw/lib/python2.5/site-packages/matplotlib/backends/backend_tkagg.py", line 252, in draw
    tkagg.blit(self._tkphoto, self.renderer._renderer, colormode=2)
  File "/sw/lib/python2.5/site-packages/matplotlib/backends/tkagg.py", line 19, in blit
    tk.call("PyAggImagePhoto", photoimage, id(aggimage), colormode, id(bbox_array))
TclError
>>> alloc: invalid block: 0x102092f50: 0 35
Abort trap
bash-3.2$ 

So opening a figure causes the crash. 
Any suggestions on how to fix this? Did anyone else have this problem? 

Could it be that there is an incompatibility with gcc ? the Fink installation has gcc 4.5. 

Any suggestions will be appreciated.  At the moment moving to python 2.6 or 2.7 seems a good idea, but it will involve a lot of testing of my code.  

Dear Forum,

I want to send the polar grid lines (circles and radial lines) behind the
plot. How can I do that? I tried other options but unable to do so. Here, I
am taking matplotlib example. Please get back to me on this.

Thanks!!!

Example: polar_demo.py
import matplotlib
import numpy as np
from matplotlib.pyplot import figure, show, rc, grid

# radar green, solid grid lines
rc('grid', color='#316931', linewidth=1, linestyle='-')
rc('xtick', labelsize=15)
rc('ytick', labelsize=15)

# force square figure and square axes looks better for polar, IMO
width, height = matplotlib.rcParams['figure.figsize']
size = min(width, height)
# make a square figure
fig = figure(figsize=(size, size))
ax = fig.add_axes([0.1, 0.1, 0.8, 0.8], polar=True, axisbg='#d5de9c')

r = np.arange(0, 3.0, 0.01)
theta = 2*np.pi*r
ax.plot(theta, r, color='#ee8d18', lw=3)
ax.set_rmax(2.0)
grid(True)

ax.set_title("And there was much rejoicing!", fontsize=20)
show()
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Hello all

I am tryint to plot the ticks in scientific notation, and I would like to
set the tick size to 2 digits (i.e. 0.5 x e-7). Instead, I am either loosing
the scientific notation or getting the scientific notation with a number of
too many decimal positions.

The problem is that my numbers are of e-7 order and if I just try to round
the number of decimal positions, I get a value of 0.0...

Here's my script

majorLocator   = MultipleLocator(PSD_2z.max()/3.0)
majorformatter = FormatStrFormatter('%1.1e') # or (%0.1f)
ax1 = fig.add_subplot(511)
ax1.ticklabel_format(style='sci',scilimits=(0,0), axis='y')
ax1.yaxis.set_major_locator(MultipleLocator(ax1.get_ylim()[1]/3.0))
ax1.yaxis.set_major_formatter(majorformatter) 

Thanks for your help!


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