matplotlib-users Mailing List for matplotlib (Page 11)

Darren Dale wrote:
> I see that passing normed=True to the hist function is supposed scale the 
> histogram counts to represent a probability distribution. Presently, this 
> renormalizes the counts such that the most popular bin is 1, but I would 
> argue that this does not represent a probability distribution. I think it 
> would be more appropriate to renormalize such that integrating over the whole 
> distribution yields 1.

Are you sure? With CVS matplotlib:

In [6]:hist(y)
Out[6]:
(array([ 17,  44, 130, 244, 260, 176,  91,  29,   8,   1]),
  array([-2.85420394, -2.18336129, -1.51251864, -0.841676  , 
-0.17083335,  0.5000093 ,
              1.17085195,  1.84169459,  2.51253724,  3.18337989]))

In [7]:hist(y, normed=True)
Out[7]:
(array([ 0.02534126,  0.06558915,  0.19378613,  0.36372166,  0.38757226, 
  0.26235661,
              0.13565029,  0.04322921,  0.0119253 ,  0.00149066]),
  array([-2.85420394, -2.18336129, -1.51251864, -0.841676  , 
-0.17083335,  0.5000093 ,
              1.17085195,  1.84169459,  2.51253724,  3.18337989]))

-- 
Robert Kern
rk...@uc...

"In the fields of hell where the grass grows high
  Are the graves of dreams allowed to die."
   -- Richard Harter

The problem I have seems more fundamental than Darren's.

Even if I start pythonw,  and then do from pylab import *, I still get  
the warning messages about being unable to open the type 1 fonts,
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/GillSanBol
   warnings.warn("Could not open font file %s"%fpath)
  etc...

and then the program crash in font_manager.py with

Traceback (most recent call last):
...............
   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


George Nurser.

I see that passing normed=True to the hist function is supposed scale the 
histogram counts to represent a probability distribution. Presently, this 
renormalizes the counts such that the most popular bin is 1, but I would 
argue that this does not represent a probability distribution. I think it 
would be more appropriate to renormalize such that integrating over the whole 
distribution yields 1.

Maybe there are other schools of thought on this subject? Is there a way that 
I can generate a physicists probability distribution with the existing 
function?

Thanks,
Darren

Fernando, Darren,

For me, on Mac OS X changing IPython/Shell.py to 
     if ver[:3] >= '2.5':

does suppress the warning about the version of wx.  But 'ipython
-pylab' still hangs on startup with a message that the program
should be run with 'pythonw', not 'python'.  This was from a
clean install with
 ~> sudo pythonw setup.py install

This installs ipython into 
 
/System/Library/Frameworks/Python.framework/Versions/2.3/bin/ipython

which is not typically in the shells PATH. 

The shebang line for the ipython script reads

#!/System/Library/Frameworks/Python.framework/Versions/2.3/Resources/Python.app/Contents/MacOS/Python

Changing that to

#!/usr/bin/env pythonw

makes 'ipython -pylab' run fine.

Maybe you want to make Mac installs put ipython in /usr/bin and
point to pythonw (which is admittedly just a bash wrapper around
/System/Library/..../Python.app/Contents/MacOS/Python)??

Hope that helps,

--Matt

On Friday 06 May 2005 12:19 am, Fernando Perez wrote:
> Matt Newville wrote:
> > Darren,
> >
> >>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?
> >
> > The wx backend from matplotlib 0.80 works fine for me with
> > wxPython 2.6.0.0 on OS X 10.3.9.
> >
> > I also get messages about not finding wxpython 2.4 or 2.5 from
> > Ipython, and on Mac OS X also have Ipython hang when started
> > with 'ipython -wthread -pylab' or 'ipython -pylab', probably
> > because it's using 'python' not 'pythonw'.  I haven't tracked it
> > down beyond that.
>
> Could you try to change in IPython/Shell.py, the line (around line 555):
>
>      if ver[:3] == '2.5':
>          import wx
>
> to
>
>      if ver[:3] >= '2.5':
>          import wx
>
> and let me know if it works again?  In that case, I'll make that change
> before the bugfix .14 release.
>

Fernando, 

Thank you, this solves it.

-- 
Darren S. Dale

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

dd...@co...

>>>>> "N" == N Volbers <mit...@we...> writes:

    N> Hello everyone on the list, I try to use the matplotlib class
    N> interface for my plotting application.  I have a question which
    N> I hope you can help me with. The attached file contains a test
    N> case for my problem. From the example 'embedding_in_gtk2.py' I
    N> figured the proper way to use the class interface was to

    N> 1. create a Figure() instance 2. create a FigureCanvas
    N> instance, using the Figure as argument 3. create a subplot by
    N> using FigureCanvas.subplot

I think you mean  "create a subplot by using Figure.add_subplot"

    N> This works fine; however now I was trying to set the limits of
    N> the plot using the Axes.set_xlim and Axes.set_ylim functions.

Call set_xlim and set_ylim after calling plot.  Plot automatically
calls autoscale on  the axes to incorporate the new data into its
range.  This should become an rc param and a kwarg (and this question
will soon become a FAQ!)

    N> As you can see from the test, it won't affect the plot! On the
    N> other hand, this method works fine if you use the pylab 'show'
    N> method as in 'poly_editor.py'. Is this a bug or should I use
    N> another function to set the limits?


It has nothing to do with show and everything to do that setting the
lim come after creating the plot elements

    N> BTW, the documentation recommends passing two arguments to
    N> set_xlim, set_ylim, while the examples pass a list/tuple. Are
    N> both ways correct?

Yes.

JDH

So obvious when someone tells you! Thanks for this, it is exactly what I was
looking for. 

Carl

----- Original Message ----- 
From: "John Hunter" <jdh...@ac...>
To: "Carl Mouser" <car...@bi...>
Cc: <mat...@li...>
Sent: Thursday, May 05, 2005 11:55 PM
Subject: Re: [Matplotlib-users] Deleting lines from a plot


> 
> 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

Hello everyone on the list,

I try to use the matplotlib class interface for my plotting 
application.  I have a question which I hope you can help me with. The 
attached file contains a test case for my problem. From the example 
'embedding_in_gtk2.py' I figured the proper way to use the class 
interface was to

1. create a Figure() instance
2. create a FigureCanvas instance, using the Figure as argument
3. create a subplot by using FigureCanvas.subplot

This works fine; however now I was trying to set the limits of the plot 
using the Axes.set_xlim and Axes.set_ylim functions.  As you can see 
from the test, it won't affect the plot! On the other hand, this method 
works fine if you use the pylab 'show' method as in 'poly_editor.py'. Is 
this a bug or should I use another function to set the limits?

BTW, the documentation recommends passing two arguments to set_xlim, 
set_ylim, while the examples pass a list/tuple. Are both ways correct?

Thanks,

Niklas Volbers.

Matt Newville wrote:
> John,
> 
> Hmm, I just installerd ipython-0.6.13 on OS X 10.3.9.  For me it
> created ipython with

[...]

> /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/IPython/Shell.py in mainloop(self=<IPShellMatplotlibWX(Thread-1, started)>)
>     712             def OnTimer(self, event):
>     713                 update_tk(self.tk)
>     714                 self.IP.runcode()
>     715 
>     716         class App(self.wx.wxApp):
>     717             wx = self.wx
>     718             TIMEOUT = self.TIMEOUT
>     719             def OnInit(self):
>     720                 'Create the main window and insert the custom frame'
>     721                 self.agent = TimerAgent(None, self.TIMEOUT)
>     722                 self.agent.Show(self.wx.false)
>     723                 self.agent.StartWork()
>     724                 return self.wx.true
>     725         
>     726         self.app = App(redirect=False)
> --> 727         self.wx_mainloop(self.app)
>         self.wx_mainloop = None
>         self.app = <IPython.Shell.App; proxy of C++ wxPyApp instance at _05a3a8e0_p_wxPyApp>
>     728         self.join()
>     729 
>     730 # A set of matplotlib public IPython shell classes, for single-threaded
>     731 # (Tk* and FLTK* backends) and multithreaded (GTK* and WX* backends) use.
>     732 class IPShellMatplotlib(IPShell):
>     733     """Subclass IPShell with MatplotlibShell as the internal shell.
>     734 
>     735     Single-threaded class, meant for the Tk* and FLTK* backends.
>     736 
>     737     Having this on a separate class simplifies the external driver code."""
>     738     
>     739     def __init__(self,argv=None,user_ns=None,debug=1):
>     740         IPShell.__init__(self,argv,user_ns,debug,shell_class=MatplotlibShell)
>     741 
>     742 class IPShellMatplotlibGTK(IPShellGTK):
> 
> TypeError: 'NoneType' object is not callable

Could you try the change I suggested in my last email?  That might fix this 
crash as well, as it will prevent the None object from being returned for wx 
2.6.  Let me know if it helps,

f

John,

Hmm, I just installerd ipython-0.6.13 on OS X 10.3.9.  For me it
created ipython with

#!/System/Library/Frameworks/Python.framework/Versions/2.3/Resources/Python.app/Content
s/MacOS/Python

Changing that to 
#!/usr/bin/env pythonw

caused ipython to crash, with IPython_crash_report.txt below.

--Matt

***************************************************************************

IPython post-mortem report

IPython version: 0.6.13 

Platform info  : os.name -> posix, sys.platform -> darwin

***************************************************************************

Current user configuration structure:

{'Version': 0,
 'alias': [''],
 'args': [],
 'autocall': 1,
 'autoindent': 1,
 'automagic': 1,
 'banner': 1,
 'c': '',
 'cache_size': 1000,
 'classic': 0,
 'color_info': 1,
 'colors': 'Linux',
 'confirm_exit': 1,
 'debug': 0,
 'deep_reload': 0,
 'editor': 'vi',
 'execfile': [],
 'execute': [''],
 'gthread': 0,
 'help': 0,
 'ignore': 0,
 'import_all': [],
 'import_mod': [],
 'import_some': [[]],
 'include': [],
 'ipythondir': '/Users/newville/.ipython',
 'log': 0,
 'logfile': '',
 'logplay': '',
 'magic_docstrings': 0,
 'messages': 1,
 'multi_line_specials': 1,
 'nosep': 0,
 'opts': Struct({'pylab': 1}),
 'pdb': 0,
 'pprint': 1,
 'profile': '',
 'prompt_in1': 'In [\\#]:',
 'prompt_in2': '   .\\D.:',
 'prompt_out': 'Out[\\#]:',
 'prompts_pad_left': 1,
 'pylab': 1,
 'quick': 0,
 'rcfile': 'ipythonrc',
 'readline': 1,
 'readline_merge_completions': 1,
 'readline_omit__names': 0,
 'readline_parse_and_bind': ['tab: complete',
                             '"\\C-l": possible-completions',
                             'set show-all-if-ambiguous on',
                             '"\\C-o": tab-insert',
                             '"\\M-i": "    "',
                             '"\\M-o": "\\d\\d\\d\\d"',
                             '"\\M-I": "\\d\\d\\d\\d"',
                             '"\\C-r": reverse-search-history',
                             '"\\C-s": forward-search-history',
                             '"\\C-p": history-search-backward',
                             '"\\C-n": history-search-forward'],
 'readline_remove_delims': '\'"-/~',
 'screen_length': -2,
 'separate_in': '\n',
 'separate_out': '',
 'separate_out2': '',
 'system_verbose': 0,
 'tk': 0,
 'upgrade': 0,
 'wthread': 0,
 'xmode': 'Context'}

***************************************************************************

Crash traceback:

---------------------------------------------------------------------------
exceptions.TypeErrorPython 2.3: /System/Library/Frameworks/Python.framework/Versions/2.3/Resources/Python.app/Contents/MacOS/Python
                                                   Thu May  5 23:13:31 2005
A problem occured executing Python code.  Here is the sequence of function
calls leading up to the error, with the most recent (innermost) call last.

/Users/newville/bin/ipython 
     -2 import IPython
     -1 
      0 IPython.Shell.start().mainloop()

/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/IPython/Shell.py in mainloop(self=<IPShellMatplotlibWX(Thread-1, started)>)
    712             def OnTimer(self, event):
    713                 update_tk(self.tk)
    714                 self.IP.runcode()
    715 
    716         class App(self.wx.wxApp):
    717             wx = self.wx
    718             TIMEOUT = self.TIMEOUT
    719             def OnInit(self):
    720                 'Create the main window and insert the custom frame'
    721                 self.agent = TimerAgent(None, self.TIMEOUT)
    722                 self.agent.Show(self.wx.false)
    723                 self.agent.StartWork()
    724                 return self.wx.true
    725         
    726         self.app = App(redirect=False)
--> 727         self.wx_mainloop(self.app)
        self.wx_mainloop = None
        self.app = <IPython.Shell.App; proxy of C++ wxPyApp instance at _05a3a8e0_p_wxPyApp>
    728         self.join()
    729 
    730 # A set of matplotlib public IPython shell classes, for single-threaded
    731 # (Tk* and FLTK* backends) and multithreaded (GTK* and WX* backends) use.
    732 class IPShellMatplotlib(IPShell):
    733     """Subclass IPShell with MatplotlibShell as the internal shell.
    734 
    735     Single-threaded class, meant for the Tk* and FLTK* backends.
    736 
    737     Having this on a separate class simplifies the external driver code."""
    738     
    739     def __init__(self,argv=None,user_ns=None,debug=1):
    740         IPShell.__init__(self,argv,user_ns,debug,shell_class=MatplotlibShell)
    741 
    742 class IPShellMatplotlibGTK(IPShellGTK):

TypeError: 'NoneType' object is not callable

***************************************************************************

History of session input:

*** Last line of input (may not be in above history):

Matt Newville wrote:
> Darren,
> 
> 
>>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?
> 
> 
> The wx backend from matplotlib 0.80 works fine for me with
> wxPython 2.6.0.0 on OS X 10.3.9.
> 
> I also get messages about not finding wxpython 2.4 or 2.5 from
> Ipython, and on Mac OS X also have Ipython hang when started
> with 'ipython -wthread -pylab' or 'ipython -pylab', probably
> because it's using 'python' not 'pythonw'.  I haven't tracked it
> down beyond that.

Could you try to change in IPython/Shell.py, the line (around line 555):

     if ver[:3] == '2.5':
         import wx

to

     if ver[:3] >= '2.5':
         import wx

and let me know if it works again?  In that case, I'll make that change before 
the bugfix .14 release.

Cheers,

f

>>>>> "Matt" == Matt Newville <new...@ca...> writes:

    Matt> The wx backend from matplotlib 0.80 works fine for me with
    Matt> wxPython 2.6.0.0 on OS X 10.3.9.

    Matt> I also get messages about not finding wxpython 2.4 or 2.5
    Matt> from Ipython, and on Mac OS X also have Ipython hang when
    Matt> started with 'ipython -wthread -pylab' or 'ipython -pylab',
    Matt> probably because it's using 'python' not 'pythonw'.  I
    Matt> haven't tracked it down beyond that.

ipython 0.6.13 on OSX uses 

  #!/usr/bin/env pythonw

I don't get the warning when using ipython -wthread on OSX with
wxpython 2.5.4.1 or linux with wxpython 2.5.3.2.  Both are using
ipython 0.6.13.

JDH

Darren,

> 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?

The wx backend from matplotlib 0.80 works fine for me with
wxPython 2.6.0.0 on OS X 10.3.9.

I also get messages about not finding wxpython 2.4 or 2.5 from
Ipython, and on Mac OS X also have Ipython hang when started
with 'ipython -wthread -pylab' or 'ipython -pylab', probably
because it's using 'python' not 'pythonw'.  I haven't tracked it
down beyond that.

--Matt

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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Christopher Barker, Ph.D.
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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