matplotlib-users Mailing List for matplotlib

Ok, I guess I found the problem is in my code (the arrays I'm passing 
are indeed empty for some reason, not surprising it can't line fit 
them). So high shame on me for having polluted the mailing list :(

A lesson in humility (and debugging) indeed.
Thanks anyway... I flee in shame.

m.

-- 
Massimo Sandal
University of Bologna
Department of Biochemistry "G.Moruzzi"

snail mail:
Via Irnerio 48, 40126 Bologna, Italy

email:
mas...@un...

tel: +39-051-2094388
fax: +39-051-2094387

On Thursday 08 June 2006 16:19, massimo sandal wrote:
> Brian Blais ha scritto:
> > I want to write a wxPython script to pull up pylab plots (in a separate
> > window), based on menu or button choices.  The script below crashes with
> > a segmentation fault. Am I doing something wrong here?  Is there a
> > workaround or fix?
>
> As far as I know, mixing wxpython and pylab this way is BAD.
>
> You should better choose between:
> - (1)Launch pylab in a separate thread
> - (2) (What I do) Using WxMPL and embedding a matplotlib plot in a
> wxPanel or wxFrame. You have to use the OO interface to matplotlib.
>
> m.

Hi,

Agree with massimo. One brief example might help:

import matplotlib
matplotlib.use('WXAgg')
from pylab import gca
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as 
FigureCanvas
from matplotlib.font_manager import fontManager, FontProperties
from matplotlib.figure import Figure
from matplotlib.axes import Subplot
import matplotlib.numerix as numpy
from matplotlib.ticker import LogLocator, MultipleLocator
from matplotlib import rcParams

import wx

<snip>

class Your_Class(wx.Frame):
    def __init__(self,parent,id,title):
        wx.Frame.__init__(self,None,-1,"Your_Title")
	<snip>
	
	self.fig = Figure(figsize=(7,5),dpi=100)
        self.axes = self.fig.add_subplot(111)
        self.canvas = FigureCanvas(self, -1, self.fig)
        self.parent = self.canvas.GetParent()
        self.canvas.mpl_connect('motion_notify_event',self.mouse_move)

	<snip: SomeSizer>
	SomeSizer.add(self.canvas, 1, wx.LEFT|wx.TOP|wx.GROW|wx.EXPAND)

#useful method examples:
    def OnRefresh(self,event=None):
        """
            refreshes the plotting window
        """
        self.canvas.draw()
        self.toolbar.update()

#then the actual drawing function:
    def plot_data(self):
        """
            actual plotting function
        """
        raw_plot(self) #imported own function, see below
        self.toolbar.update() #not necesarry, but might help

def raw_plot(parent):
# note that all meta data / parameters from the parent are accessible !
# e.g. color = parent.color
	parent.fig.clear()
	a = parent.fig.add_subplot(211)
	etc. etc. etc.

Thought this might be helpful to get started. You might want to write things a 
different way, though. Particularly the my application is a bit more than 
just a short script, so feel free to drop anything you don't want.

One last thing: I'd recommend having a look at the matplotlib examples 
('embedding_in_wx*.py').

Cheers,
Christian

On Thursday 08 June 2006 10:35, massimo sandal wrote:
> Hi,
> I upgraded today to matplotlib 0.87.3, compiled from source.
> I noticed the following error when in my application I try to export the
> plot in EPS format. The odd thing is that the export actually works and
> produces a good eps file, but nevertheless...
>
> File "hooke.py", line 354, in ExportImage #that's my wxpython+MPL app
>      self.figure.savefig(filename)
>    File "/usr/lib/python2.4/site-packages/matplotlib/figure.py", line
> 660, in savefig
>      self.canvas.print_figure(*args, **kwargs)
>    File
> "/usr/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py",
> line 1123, in print_figure
>      else: shutil.move(tmpfile, outfile)
>    File "/usr/lib/python2.4/shutil.py", line 193, in move
>      copy2(src,dst)
>    File "/usr/lib/python2.4/shutil.py", line 93, in copy2
>      copystat(src, dst)
>    File "/usr/lib/python2.4/shutil.py", line 68, in copystat
>      os.utime(dst, (st.st_atime, st.st_mtime))
> OSError: [Errno 1] Operation not permitted: 'figura001.eps'

please submit a short script that reproduces the problem.

Hi,
I upgraded today to latest numpy (0.9.8) and matplotlib (0.87.3).
I still have the same error (upgraded code in snippet):

>> ---------
>> import matplotlib.numerix as nx
>>
>> contact_x_points=nx.array(x_points[left_bound:right_bound])
>> contact_y_points=nx.array(y_points[left_bound:right_bound])
>>
>> A=nx.ones((len(contact_x_points),2))
>> A[:,0]=contact_x_points 
>> result=nx.linalg.lstsq(A,contact_y_points)
>> ---------
>>
>> ...but when I run, it crashes with:
>>
  >>    result=nx.linalg.lstsq(A, contact_y_points)
  >>  File "/usr/lib/python2.4/site-packages/numpy/linalg/linalg.py",
line >>  457, in lstsq
  >>    nlvl = max( 0, int( math.log( float(min( m,n ))/2. ) ) + 1 )
  >>  OverflowError: math range error

any hint?

m.

-- 
Massimo Sandal
University of Bologna
Department of Biochemistry "G.Moruzzi"

snail mail:
Via Irnerio 48, 40126 Bologna, Italy

email:
mas...@un...

tel: +39-051-2094388
fax: +39-051-2094387

The main purpose of this release is to take advantage of the new aspect 
ratio handling in matplotlib 0.87.3.

Some new features have been added (new polar-centric convenience 
projections, sinusoidal projection, ability to plot land-sea masks, 
pcolormesh method), and numerous bugs were squashed.

Here is the full list of changes since 0.8.2:

           * updated for new matplotlib aspect ratio handling.
           Now maps will always have the correct aspect ratio.
           * if resolution keyword is set to None when Basemap
           instance is created, no boundary data sets are needed
           (methods to draw boundaries, like drawcoastlines, will
           raise an exception).
           * update to proj4 module - renamed pyproj to avoid
           conflicts with proj4 module from CDAT.
           * createfigure method deprecated, since maps
           will now automatically have the correct aspect ratio.
           * Added new projections Xpstere, Xplaea, Xpaeqd (where X
           can be n or s).  These are special-case, polar-centric
           versions of the stereographic, lambert azimuthal equal area
           and azimuthal equidistant projections that don't require
           you specify the lat/lon values of the lower-left and upper-right
           corners. 
           * fixed bugs in plot, scatter and mapboundary methods for
           miller, cylindrical and mercator projections.
           * 'crude' and 'low' resolution boundary datasets now installed
           by default.  basemap_data package now only needed for to get
           'intermediate' and 'high' resolution datasets.
           * moved all packages under single lib/ directory so
       setuptools' "develop" command works properly.
           * Added sinusoidal projection.
           * bilinear interpolation routines can return masked arrays with
           values outside range of data coordinates masked.
           * New examples (warpimage.py - warping an image to
           different map projections, polarmaps.py - simplified polar
           projections, garp.py - 'World According to Garp' maps).
           * pcolormesh method added.
           * drawlsmask method added for masking oceans and/or land areas.
           5 minute land-sea mask dataset added.


-Jeff

-- 
Jeffrey S. Whitaker         Phone  : (303)497-6313
Meteorologist               FAX    : (303)497-6449
NOAA/OAR/PSD  R/PSD1        Email  : Jef...@no...
325 Broadway                Office : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web    : http://tinyurl.com/5telg

Hi,
I upgraded today to matplotlib 0.87.3, compiled from source.
I noticed the following error when in my application I try to export the 
plot in EPS format. The odd thing is that the export actually works and 
produces a good eps file, but nevertheless...

File "hooke.py", line 354, in ExportImage #that's my wxpython+MPL app
     self.figure.savefig(filename)
   File "/usr/lib/python2.4/site-packages/matplotlib/figure.py", line 
660, in savefig
     self.canvas.print_figure(*args, **kwargs)
   File 
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py", 
line 1123, in print_figure
     else: shutil.move(tmpfile, outfile)
   File "/usr/lib/python2.4/shutil.py", line 193, in move
     copy2(src,dst)
   File "/usr/lib/python2.4/shutil.py", line 93, in copy2
     copystat(src, dst)
   File "/usr/lib/python2.4/shutil.py", line 68, in copystat
     os.utime(dst, (st.st_atime, st.st_mtime))
OSError: [Errno 1] Operation not permitted: 'figura001.eps'

Thanks as usual!

Massimo

-- 
Massimo Sandal
University of Bologna
Department of Biochemistry "G.Moruzzi"

snail mail:
Via Irnerio 48, 40126 Bologna, Italy

email:
mas...@un...

tel: +39-051-2094388
fax: +39-051-2094387

Brian Blais ha scritto:
> I want to write a wxPython script to pull up pylab plots (in a separate window), 
> based on menu or button choices.  The script below crashes with a segmentation fault. 
> Am I doing something wrong here?  Is there a workaround or fix?

As far as I know, mixing wxpython and pylab this way is BAD.

You should better choose between:
- (1)Launch pylab in a separate thread
- (2) (What I do) Using WxMPL and embedding a matplotlib plot in a
wxPanel or wxFrame. You have to use the OO interface to matplotlib.

m.
-- 
Massimo Sandal
University of Bologna
Department of Biochemistry "G.Moruzzi"

snail mail:
Via Irnerio 48, 40126 Bologna, Italy

email:
mas...@un...

tel: +39-051-2094388
fax: +39-051-2094387

Hi,
I'd do it the quick way:

str = [...] # list of strings for the labels.
x[:] # abcisse vector
y[i][:] # list of ordinate vector (y[i][:] contains the data for the ith
line)

for i in range(10):
    text(x[-1], y[i][-1], str[i], horizontalalignement='left')

David





2006/6/7, Webb Sprague <web...@gm...>:
>
> Is there a way to programmatically write line labels, as in the
> attached image?  If it doesn't go through the list, basically I want a
> label at the end of each of 10 or so lines in a plot.
>
> Tx
>
>
>
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
>

i succed,

just do this :

labels = getp(gca(), 'xticklabels')
setp(labels, 'rotation', 45,'horizontalalignment', 'right', fontsize=8)

that's all ;)

Hello,

I want to write a wxPython script to pull up pylab plots (in a separate window), 
based on menu or button choices.  The script below crashes with a segmentation fault. 
  Am I doing something wrong here?  Is there a workaround or fix?



			thanks,


				Brian Blais

#!/usr/bin/env python

from wxPython.wx import *
import pylab

class MyFrame(wxFrame):

     def __init__(self, parent, id, title):
         wxFrame.__init__(self, parent, -1, title)
         self.CenterOnScreen()

         menuBar = wxMenuBar()

         # 1st menu from left
         menu1 = wxMenu()
         menu1.Append(101, "&New")
         menu1.Append(102, "&Close", "Close this frame")
         menuBar.Append(menu1, "&File")
         EVT_MENU(self, 101, self.New)
         EVT_MENU(self, 102, self.Close)

         self.SetMenuBar(menuBar)
         self.Show(True)

     def New(self, event):
         pylab.plot([1,2,3,4],[5,6,7,8])
         pylab.show()

     def CloseWindow(self, event):
         self.Close()


class App(wxApp):
     def OnInit(self):
         frame = MyFrame(None, -1, "testing")
         self.SetTopWindow(frame)
         return True

def main():

     app = App(0)
     app.MainLoop()


if __name__ == "__main__":
     main()


-- 
-----------------

              bb...@br...
              http://web.bryant.edu/~bblais

i want to have this x  axe look, not with date, but with any words, i 
don't find how  i can do this

Thx

On Wednesday 07 June 2006 16:45, John Hunter wrote:
> >>>>> "William" == William Hartt <wh...@gm...> writes:
>
>     William> Does anyone know the syntax for fraction used in
>     William> mathtext?  The LaTex version is \frac{num}{denom} but
>     William> this gives an error.
>
> mathtext doesn't currently support frac (but hopefully it will by the
> end of the summer as we have a google summer-of-code student working
> on mathtext).  As Ryan noted, if you have access to TeX/LaTeX on your
> system, you can use that to render your equations
>
> Requirements:
>
>   tex
>
>   *Agg backends: dvipng
>
>   PS backend: latex w/ psfrag, dvips, and Ghostscript 8.51
>   (older versions do not work properly)

I think we can relax the ghostscript requirement to version 7.07 or later. I 
worked through some issues a few months back, and my test script (which 
produces three different sized plots for every combination of text.usetex and 
ps.usedistiller settings) didnt indicate any problems using ESP Ghostscript 
7.07. 

Darren

Hi all,

Can I use formulas within the legend command, e.g.

legend( ('$\sin(x)$', '$\cos(x)$'), loc='upper left')

Nils

No problem with the last version ;)

thx Developpers

Iv got an error , when all the value in the list is the same,
" b=points[a+1]-points[a]"=0
then "list_progre"=[0,0,0,0,0,0,0]
and then : "progres=plot(dt_date, list_progre, '')" made me an error : 
"var = dv/max(abs(vmin), abs(vmax)) ZeroDivisionError: float division"

what can i do to stop this error

thx

The program test:

from pylab import *

list_progre=[]
dt_date=[12,13,14,15,16,17,18,19]
points=[25,25,25,25,25,25,25,25]
num_fig=1
nom='test'
chemin_fichier='C:\Python24\uni_33\\'

long_list=len(points)-1
a=0
while a<long_list :
    b=points[a+1]-points[a]
    list_progre.append(b)
    a=a+1

f=figure(num_fig,figsize=(8,6), dpi=72)
subplot(211)
classt=plot(dt_date, points, '')
setp(classt, color='r', linewidth=2.0)
title('Nombre de point au classement general')
xlabel('time')
ylabel('points')
del(dt_date[0])
subplot(212)
progres=plot(dt_date, list_progre, '')
setp(progres, color='g', linewidth=1.0)
title('Progression')
nom_fichier=string.replace(nom,' ','_')
rep_fichier=chemin_fichier+'stat_img\\'
savefig(rep_fichier+nom_fichier, dpi=50)
show()
#f.clf()

Is there a way to programmatically write line labels, as in the
attached image?  If it doesn't go through the list, basically I want a
label at the end of each of 10 or so lines in a plot.

Tx