matplotlib-users Mailing List for matplotlib

Darren Dale wrote:

> I just upgraded wxPython a couple days ago, and got error messages about not 
> finding wxpython 2.4 or 2.5. Can anyone say whether the wx backend and 
> IPython are compatible with the new wxpython release? 

On the ipython side, no idea.  I don't use wx myself much, so I can't say (and 
I can't upgrade right now to test, sorry).

f

On Thursday 05 May 2005 6:55 pm, George Nurser wrote:
> I believe I have got all the prerequisites, but it might not be so...
> 
> old Powerbook, 400 MHz, 10.3.9.
> 
> zlib, libpng, tk_inter, freetype 2.1.9, wx-2.6-mac-unicode, standard  
> Apple Python 2.3, updated to MacPython, Numeric.
> 
> matplotlib compiled & installed apparently fine. No warnings that I  
> could see.
> 
> 
> Fairly drastic problem occurs when I do
> import from pylab *
> in the python shell.
[...]
>
> Anybody have any idea of what I have missed doing?
>

I just upgraded wxPython a couple days ago, and got error messages about not 
finding wxpython 2.4 or 2.5. Can anyone say whether the wx backend and 
IPython are compatible with the new wxpython release? 

-- 
Darren S. Dale

Bard Hall
Department of Materials Science and Engineering
Cornell University
Ithaca, NY. 14850

dd...@co...

I believe I have got all the prerequisites, but it might not be so...

old Powerbook, 400 MHz, 10.3.9.

zlib, libpng, tk_inter, freetype 2.1.9, wx-2.6-mac-unicode, standard  
Apple Python 2.3, updated to MacPython, Numeric.

matplotlib compiled & installed apparently fine. No warnings that I  
could see.


Fairly drastic problem occurs when I do
import from pylab *
in the python shell.

1. get stream of warnings about  type 1 fonts...
e.g.
/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ 
site-packages/matplotlib/font_manager.py:465: UserWarning: Could not  
open font file /Users/agn/Library/Fonts/Euclid Math Two
   warnings.warn("Could not open font file %s"%fpath)
/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ 
site-packages/matplotlib/font_manager.py:465: UserWarning: Could not  
open font file /Library/Fonts/EucliSymIta
  Think I can understand why this might be, as neither TT or X11.

One only of the .dfonts in /System/Library/Fonts fails--
/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ 
site-packages/matplotlib/font_manager.py:465: UserWarning: Could not  
open font file /System/Library/Fonts/LastResort.dfont
   warnings.warn("Could not open font file %s"%fpath)
  -- no warnings from rest of .dfonts.

2. More seriously, loading from pylab fails with FontManager error:

raceback (most recent call last):
   File "/usr/local/bin/ipython", line 28, in ?
     IPython.Shell.start().mainloop()
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/IPython/Shell.py", line 809, in start
     return shell()
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/IPython/Shell.py", line 740, in __init__
      
IPShell.__init__(self,argv,user_ns,debug,shell_class=MatplotlibShell)
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/IPython/Shell.py", line 54, in __init__
     shell_class=shell_class)
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/IPython/ipmaker.py", line 85, in make_IPython
     IP = shell_class('__IP',user_ns=user_ns,**kw)
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/IPython/Shell.py", line 493, in __init__
     user_ns,b2 = self._matplotlib_config(name)
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/IPython/Shell.py", line 373, in  
_matplotlib_config
     from matplotlib import backends
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/backends/__init__.py", line 19, in ?
     globals(),locals(),[backend_name])
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/backends/backend_tkagg.py", line 9,  
in ?
     from backend_agg import FigureCanvasAgg
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/backends/backend_agg.py", line 82,  
in ?
     from matplotlib.figure import Figure
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/figure.py", line 3, in ?
     from axes import Axes, Subplot, PolarSubplot, PolarAxes
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/axes.py", line 12, in ?
     from axis import XAxis, YAxis
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/axis.py", line 20, in ?
     from font_manager import FontProperties
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/font_manager.py", line 991, in ?
     fontManager = FontManager()
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/font_manager.py", line 835, in  
__init__
     rebuild()
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/font_manager.py", line 828, in  
rebuild
     self.ttfdict = createFontDict(self.ttffiles)
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/font_manager.py", line 467, in  
createFontDict
     prop = ttfFontProperty(font)
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/font_manager.py", line 347, in  
ttfFontProperty
     size = str(float(font.get_fontsize()))
AttributeError: get_fontsize


Anybody have any idea of what I have missed doing?

Regards, George Nurser.

Vidar Gundersen wrote:

> i want to create a new vector containing the minimum value
> from each row in a matrix, and i've tried 
> 
> from pylab import *
> xmin = min(x, axis=1)
> xmin = min(transpose(x))


there may be a shortcut on numerix, but he Numeric way to write this is:

xmin = minimum.reduce(x, axis=1)

-Chris

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Chr...@no...

>>>>> "Darren" == Darren Dale <dd...@co...> writes:

    Darren> In CVS, I added a file to the examples called
    Darren> newscalarformatter_demo.py, which shows how to use the
    Darren> NewScalarFormatter without renaming anything in
    Darren> ticker.py. It also illustrates the different options and
    Darren> improvements over the original formatter.

Well, you're "old formatter" example certainly makes a compelling case
for the new one :-)

The cm fonts are a bit irritating though, eg the \times symbol appears
fainter than the numbers.

    Darren> I felt I was posting too frequently to this list, so I
    Darren> opened a bugreport at the sourceforge website (which
    Darren> includes images from the new demo). Please direct future
    Darren> comments and reports to the bugreport page.

I don't think posting new features and bug fixes constitutes spam :-)

JDH

In CVS, I added a file to the examples called newscalarformatter_demo.py, 
which shows how to use the NewScalarFormatter without renaming anything in 
ticker.py. It also illustrates the different options and improvements over 
the original formatter.

I felt I was posting too frequently to this list, so I opened a bugreport at 
the sourceforge website (which includes images from the new demo). Please 
direct future comments and reports to the bugreport page.

Thanks,
Darren

Florian Lindner wrote:
> Hello,
> I'm using matplotlib like that:
> 
> import matplotlib
> matplotlib.use("Agg")
> import pylab
> pylab.plot(*values)
> pylab.savefig("testfig.png")
> 
> print values gives this output:
> 
> [['1', '2', '3', '4', '5'], ['11', '12', '13', '14', '15']]

> What am I doing wrong?

Passing strings. Use numbers.

-- 
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'm using matplotlib like that:

import matplotlib
matplotlib.use("Agg")
import pylab
pylab.plot(*values)
pylab.savefig("testfig.png")

print values gives this output:

[['1', '2', '3', '4', '5'], ['11', '12', '13', '14', '15']]

But the pylab.plot(*values) gives a traceback:

Traceback (most recent call last):
  File "visualizer.py", line 8, in ?
    main()
  File "visualizer.py", line 6, in main
    g.createGraphs()
  File "/home/florian/visualizer/GraphCreator.py", line 21, in createGraphs
    pylab.plot(*values)
  File "/usr/lib/python2.3/site-packages/matplotlib/pylab.py", line 1899, in 
plot
    ret =  gca().plot(*args, **kwargs)
  File "/usr/lib/python2.3/site-packages/matplotlib/axes.py", line 2409, in 
plot
    for line in self._get_lines(*args, **kwargs):
  File "/usr/lib/python2.3/site-packages/matplotlib/axes.py", line 271, in 
_grab_next_args
    yield self._plot_2_args(remaining, **kwargs)
  File "/usr/lib/python2.3/site-packages/matplotlib/axes.py", line 226, in 
_plot_2_args
    markerfacecolor = c,
  File "/usr/lib/python2.3/site-packages/matplotlib/lines.py", line 135, in 
__init__
    self.set_data(xdata, ydata)
  File "/usr/lib/python2.3/site-packages/matplotlib/lines.py", line 202, in 
set_data
    raise RuntimeError('xdata and ydata must be the same length')
RuntimeError: xdata and ydata must be the same length

What am I doing wrong?

Thanks,
Florian

If you know which line you want to delete, you can call
ax.lines.remove(line) where line is a line instance.

    In [1]: line1, = plot(rand(10), 'ro')
    In [2]: line2, = plot(rand(20), 'b--s')
    In [3]: ax = gca()
    In [4]: ax.lines.remove(line1)
    In [5]: draw()

If you haven't saved the line instance, but can otherwise identify it
(eg you know it was the first line you plotted), you can do something
like

  ax.lines.remove(ax.lines[0])

or if you have labeled the line, you can identify and remove it with

  plot(x,y,label='my line')
  line = [line for line in ax.lines if line.get_label()=='my line'][0]
  ax.lines.remove(line)

JDH

Hi,

One way of doing this is to plot the same line again with the color set to
the background color. 

Wendell Cropper


At 05:56 PM 5/5/2005 +1000, you wrote:
>Is it possible to delete a line from a plot without clearing the entire
>axis, or effecting
>any other lines that may be their? In Matlab, it is possible to delete(h)
>where h is
>the handle to a line. However, I can't seem to find an equivelent command in
>Matplotlib (either in the Pylab or OO interface).
>
>Thanks,
>Carl
>
>
>
>
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wcr...@uf...

===== Original message from John Hunter | Wed, 04 May 2005:
> Amazing so few lines produce such a cool looking figure, no?

yes, the transparency is useful for giving the plotted data
an extra dimension, both aesthetic and beeing able to show
more in one plot. try doing this in MATLAB, R or gnuplot.

i'm struggling with something related to this plot i'm
working on, and it's a bit stupid, i think, to ask, and
i don't know if it's a matplotlib problem:

i want to create a new vector containing the minimum value
from each row in a matrix, and i've tried 

from pylab import *
xmin = min(x, axis=1)
xmin = min(transpose(x))

but either i get error messages, or unexpected results.

Is it possible to delete a line from a plot without clearing the entire
axis, or effecting
any other lines that may be their? In Matlab, it is possible to delete(h)
where h is
the handle to a line. However, I can't seem to find an equivelent command in
Matplotlib (either in the Pylab or OO interface).

Thanks,
Carl

I fixed two bugs in the new formatter, improving placement of the new labels 
so they play nice with changing font sizes and window resizes. I also added 
support for mathtext rendering of scientific notation, which can be toggled 
for now in ticker.NewScalarFormatter.__init__. Maybe I'll make it 
configurable in the rc file some day, depending on user sentiment. The 
changes are available in CVS. 

I think this thing is pretty functional and stable now. Please continue 
testing it!

-- 
Darren S. Dale

Bard Hall
Department of Materials Science and Engineering
Cornell University
Ithaca, NY. 14850

dd...@co...

> I added in the self.Refresh() command. Then the window turns
> white when the programs comes to that point. 

Like John said, it would be much easier to help if you could
post a simple example that we could run.

> I also tried to add a time.sleep(0.1) inside the for loop so
> that the GUI could respond to other events, but it had no
> effect.

Inserting the time.sleep() will completely block the GUI from
responding during that time.  I doubt that's what you want.

It's usually best to avoid long-running code that will blocak
GUI events inside a GUI program.  Inserting something like
self.Refresh()  or self.canvas.gui_repaint() may help, but won't
do anything while the loop is executing non-GUI code, such as
time.sleep(), or (I'm assuming) your self.el.calc**()  methods.

I'd guess that you want to put your calculation into a different
thread and then generate a GUI event to redraw the data when
each iteration is ready.

Hope that helps,

--Matt

>>>>> "Darren" == Darren Dale <dd...@co...> writes:

    Darren> I am putting the finishing touches on the new formatter,
    Darren> but I need to figure out how to do a regular expression
    Darren> that will match each of these strings:

    Darren> r'$10$' r'$+7.3567{\times}10$' r'$-5.740977777{\times}10$'
    Darren> r'${\times}10$'

Rather than trying to craft the mother of all regexes, you may want o
make a series of them.  Iterate over the series and if one matches,
use it.

JDH