matplotlib-users Mailing List for matplotlib

thanks to you all, that's a really big help!!! 
On 2005年3月31日 09:38:26 -0500, Darren Dale <dd...@co...> wrote:
> On Thursday 31 March 2005 04:34 am, Jan Rienyer Gadil wrote:
> > ok, so i've done plotting two list on boa/wxpython
> > now, i want to add labels and everything else to my graph...
> > adding labels i've done this:
> >
> > self.figure = Figure()
> > self.axes = self.figure.add_subplot(111)
> >
> > self.axes.plot(parent.listX,parent.listY, 'bo')
> >
> > self.axes.xlabel(parent.Xaxis.GetStringSelection())
> > self.axes.ylabel(parent.Xaxis.GetStringSelection())
> >
> > self.canvas = FigureCanvas(self, -1, self.figure)
> >
> > ===========================================
> > but i'm getting some error that says:
> > Traceback (most recent call last):
> > File "E:\final docu\Folder4.2pssl2\wxFrame1.py", line 729, in
> > OnGraphOldFileButton
> > wxFrame2.create(self).Show(true)
> > File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 16, in create
> > return wxFrame2(parent)
> > File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 39, in __init__
> > self.axes.xlabel(parent.Xaxis.GetStringSelection())
> >
> > AttributeError: Subplot instance has no attribute 'xlabel'
> >
> > ==============================================
> > what should i do???
> 
> Hi Jan,
> 
> axes.xlabel doesnt exist. What you are looking for is
> 
> self.axes.set_xlabel(parent.Xaxis.GetStringSelection())
> self.axes.set_ylabel(parent.Xaxis.GetStringSelection())
> 
> The Matplotlib devs have put a lot of effort into documenting the project. In
> situations like this, I often end up relying on the python interactive
> interpreter to find the method I am looking for:
> 
> from pylab import *
> fig = figure()
> ax = fig.add_subplot(111)
> dir(ax)
> 
> or you could add a line in your own code:
> 
> self.figure = Figure()
> self.axes = self.figure.add_subplot(111)
> 
> self.axes.plot(parent.listX,parent.listY, 'bo')
> print dir(self.axes)
> 
> both would give you a list of available methods.
> 
> Hope this helps,
> 
> Darren
>

John, Kristen:
Thanks a lot for the replies! This is really helpful information.
Also, John, apologies for not looking in the user's guide. I actually misread
its link to be an alternative (PDF) form of the normal docs. Sorry!
Thanks again,
Brian

What's new in matplotlib 0.74
basic unicode support in *Agg and PS
 See examples/unicode_demo.py. Unicode strings are rendered in the
 agg and postscript backends. Currently, all the symbols in the
 unicode string have to be in the active font file. In later
 releases we'll try and support symbols from multiple ttf files in
 one string. No support yet for unicode ttf filenames
Auto-legends
 The automatic placement of legends is now supported with loc='best';
 see examples/legend_auto.py. We did this at the matplotlib sprint
 at pycon -- Thanks John Gill and Phil! Note that your legend will
 move if you interact with your data and you force data under the
 legend line. If this is not what you want, use a designated
 location code.
Quiver (direction fields)
 Ludovic Aubry contributed a patch for the matlab compatible quiver
 method. This makes a direction field with arrows. See
 examples/quiver_demo.py
boxplot
 David Haas contributed a matlab-compatible boxplot function -- see
 examples/boxplot_demo.py. This currently returns all the boxplot
 boxes, whiskers, flyer points, etc as a list of lines. This will
 soon be refactored to return multiple lists so that the different
 elements can be more readily configured.
Hubble data example
 Perry Greenfield of STScIcontributed this nice example showing
 Hubble data with overlayed
 contours. http://matplotlib.sf.net/screenshots.html#hstdemo
minor enhancements and bug-fixes
 Some ticker locations bugs were fixed including a problem causing a
 memory error in psd, an ellipse bug in backend ps that was causing
 errant lines was fixed, svg text enhanced, added label kwarg to axes
 constructor to support creation of otherwise identical axes, fixed
 the NULL string pointer causing some Japanses fonts to segfault mpl
Downloads at http://matplotlib.sf.net
JDH

John Hunter wrote:
>>>>>>"Darren" == Darren Dale <dd...@co...> writes:
> 
> 
> Darren> Segmentation fault
> 
> me too -- does the stat64 call ring a bell with anyone? Or does the
> output below indicate the stat64 call succeeded and a subsequent
> unknown followup call failed. I'm an strace baby....
> 
> peds-pc311:~> strace pydoc matplotlib.axes
FWIW, identical output here, Fedora 3 box. Python bug, me says.
Best,
f

>>>>> "Darren" == Darren Dale <dd...@co...> writes:
 Darren> """ % ', '.join(Axes._events) # <---Whats that
 Darren> doing there?
It's building the appropriate docstring from the Axes._events Note
that _events is defined above that docstring with
 _events = ('xlim_changed', 'ylim_changed')
This is basically the principle of trying to avoid having to change
things in two places. We do a lot of this kind of stuff with
docstrings, especially in the pylab module
Eg, for the plot documentation
 plot.__doc__ = _shift_string(Axes.plot.__doc__) + """
 Addition kwargs: hold = [True|False] overrides default hold state"""
You can test removing it to see if this is the cause of the segfault,
but I would be surprised....
Thanks,
JDH

Disregard that last email, I just learned something new. Sorry.
-- 
Darren

On Thursday 31 March 2005 09:56 am, John Hunter wrote:
> >>>>> "Darren" == Darren Dale <dd...@co...> writes:
>
> Darren> Segmentation fault
I'm looking through axes.py trying to find a badly formatted docstring (or 
something) and found this:
 def connect(self, s, func):
 """
 Register observers to be notified when certain events occur. Register
 with callback functions with the following signatures. The function
 has the following signature
 func(ax) # where ax is the instance making the callback.
 The following events can be connected to: %s
 The connection id is is returned - you can use this with
 disconnect to disconnect from the axes event
 """ % ', '.join(Axes._events) # <---Whats that doing there?
-- 
Darren

>>>>> "Darren" == Darren Dale <dd...@co...> writes:
 Darren> Segmentation fault
me too -- does the stat64 call ring a bell with anyone? Or does the
output below indicate the stat64 call succeeded and a subsequent
unknown followup call failed. I'm an strace baby....
peds-pc311:~> strace pydoc matplotlib.axes
...snip....
read(3, "e:\n rowColours = \'w\' "..., 4096) = 4096
read(3, ", x.typecode())\n if len(y"..., 4096) = 4096
read(3, "numRows, numCols, plotNum)\n\n "..., 4096) = 4096
read(3, "nit_bbox(), self.bbox)\n\n\n def"..., 4096) = 4096
read(3, "\')\n t.set_transform(s"..., 4096) = 4096
read(3, "for polar axes (yet)\')\n\n\n def"..., 4096) = 2678
read(3, "", 4096) = 0
close(3) = 0
munmap(0x40ba0000, 4096) = 0
stat64("/usr/local/lib/python2.3/site-packages/matplotlib/axes.py", {st_mode=S_IFREG|0644, st_size=129654, ...}) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
peds-pc311:~> uname -a
Linux peds-pc311.bsd.uchicago.edu 2.4.21-15.0.2.ELsmp #1 SMP Wed Jun 16 22:52:07 EDT 2004 i686 i686 i386 GNU/Linux
peds-pc311:~>

I am getting a Segmentation fault when I run
$ pydoc matplotlib.axes
Could someone confirm this?
-- 
Darren

>>>>> "Brian" == Brian B <b-m...@bb...> writes:
 Brian> Hello, I graph of weather data from a CGI script using the
 Brian> Agg backend only. The graph is a common time
 Brian> vs. temperature 2D line plot. Since the graph plots every n
 Brian> minutes, the lines on the graph tend to look pointed and
 Brian> not very aesthetically pleasing (as many people have
 Brian> informed me.) I did some research and found I needed to do
 Brian> curve fitting.
 Brian> I'm trying to use 8th order polynomial fitting. I have
 Brian> found a sample on the Web that shows how to use matplotlib
 Brian> to do a best-fit line from polyfit, but I want a curve that
 Brian> follows the curve of weather temperature data.
 Brian> I plot the data using a list of X-coordinates and a list of
 Brian> Y-coordinates. I assume I can call polyfit with (x,y,8)
 Brian> for 8th order polynomial fitting. However, I am not sure
 Brian> what to do with the results. I have tried to translate the
 Brian> 1st order polyfit example for my needs but I don't think I
 Brian> am using the polyfit data correctly.
You would need to use polyval to get the results of polyfit (there is
an example in the matplotlib Users Guide in the Cookbook chapter for a
3rd order fit), but I don't think you want to use an 8-th order
polynomial for this -- as you indicate below, a spline or a filter is
a better choice.
 Brian> Also, it has been suggested that a spline or Butterworth
 Brian> filter on the data may yield more predictable results. I
 Brian> have found some of this functionality in SciPy and a nifty
 Brian> module in a language called Octave. Would matplotlib
 Brian> benefit from this?
Use spline if you want a curve that passes through all your data, use
butterworth or convolution if you want to smooth your data.
scipy is your best bet -- scipy spline and a butterworth filter
examples from my scipy examples directory are included. In general,
we try to stay focused on plotting in matplotlib rather than
algorithms, and leave algorithms to the scipy folks. They are working
hard on getting a modular package that is easy to install. I think it
would be useful to provide some wrappers around scipy in the
matplotlib.mlab module that exposed a matlab interface to some of
their algorithms, with imports done in such a way that having the
additional scipy functionality would be optional
Here is a scipy spline example, plotted with mpl
 from scipy import arange, sin, pi, interpolate
 from pylab import plot, show
 # Cubic-spline
 t = arange(0, 2.0, 0.1)
 y = sin(2*pi*t)
 tck = interpolate.splrep(t, y, s=0)
 tnew = arange(0, 2.0, 0.01)
 ynew = interpolate.splev(tnew, tck, der=0)
 plot(t, y, 'o', tnew, ynew)
 show()
And here is a butterworth filter. Note that filters can introduce
phase shifts in your data (illustrated in this example) so use with
caution!
 from __future__ import division
 from scipy import signal, arange, sin, pi, linspace, transpose
 from RandomArray import normal
 from pylab import plot, show, subplot
 from scipy.signal import buttord, butter, lfilter
 dt = 0.001
 t = arange(0.0, 10.0, dt)
 nse = normal(0.0, 0.1, t.shape)
 #s = 
 s = normal(0.0, 1.0, (len(t),22))
 for i in range(22):
 s[:,i] += sin(2*pi*t)
 lpcf = 3
 lpsf = 5
 Nyq = 1/(2*dt)
 Rp = 2
 Rs = 20
 Wp = lpcf/Nyq
 Ws = lpsf/Nyq
 [n,Wn] = buttord(Wp,Ws,Rp,Rs)
 [b,a] = butter(n,Wn)
 xlp = transpose(lfilter(b,a,transpose(s)))
 subplot(311)
 plot(t, s[:,0])
 subplot(312)
 plot(t, xlp[:,0])
 subplot(313)
 plot(t, xlp[:,1])
 show()
 Brian> Any assistance is much appreciated. I'm just starting out
 Brian> on this type of stuff but it is fascinating to work with!
Have fun!
JDH

On Thursday 31 March 2005 04:34 am, Jan Rienyer Gadil wrote:
> ok, so i've done plotting two list on boa/wxpython
> now, i want to add labels and everything else to my graph...
> adding labels i've done this:
>
> self.figure = Figure()
> self.axes = self.figure.add_subplot(111)
>
> self.axes.plot(parent.listX,parent.listY, 'bo')
>
> self.axes.xlabel(parent.Xaxis.GetStringSelection())
> self.axes.ylabel(parent.Xaxis.GetStringSelection())
>
> self.canvas = FigureCanvas(self, -1, self.figure)
>
> ===========================================
> but i'm getting some error that says:
> Traceback (most recent call last):
> File "E:\final docu\Folder4.2pssl2\wxFrame1.py", line 729, in
> OnGraphOldFileButton
> wxFrame2.create(self).Show(true)
> File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 16, in create
> return wxFrame2(parent)
> File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 39, in __init__
> self.axes.xlabel(parent.Xaxis.GetStringSelection())
>
> AttributeError: Subplot instance has no attribute 'xlabel'
>
> ==============================================
> what should i do???
Hi Jan,
axes.xlabel doesnt exist. What you are looking for is 
self.axes.set_xlabel(parent.Xaxis.GetStringSelection())
self.axes.set_ylabel(parent.Xaxis.GetStringSelection())
The Matplotlib devs have put a lot of effort into documenting the project. In 
situations like this, I often end up relying on the python interactive 
interpreter to find the method I am looking for:
from pylab import *
fig = figure()
ax = fig.add_subplot(111)
dir(ax)
or you could add a line in your own code:
 self.figure = Figure()
 self.axes = self.figure.add_subplot(111)
 self.axes.plot(parent.listX,parent.listY, 'bo')
 print dir(self.axes)
both would give you a list of available methods.
Hope this helps,
Darren

>>>>> "Jan" =3D=3D Jan Rienyer Gadil <jr...@gm...> writes:
 Jan> ok, so i've done plotting two list on boa/wxpython now, i
 Jan> want to add labels and everything else to my graph... adding
 Jan> labels i've done this:
Glad to see you are getting this working...
 self.figure =3D Figure()=20
 self.axes =3D self.figure.add_subplot(111)=20=わ20=わ20=わ20=わ20=わ20=わ20
 self.axes.plot(parent.listX,parent.listY, 'bo')=20=わ20=わ20=わ20=わ20=わ20
 self.axes.xlabel(parent.Xaxis.GetStringSelection())
 Jan> AttributeError: Subplot instance has no attribute 'xlabel'
Rather than giving you the answer, I'll show you how to find it....
You can use python's introspection capability (help, dir, type) to ask
an object about itself. You can insert print statements directly into
your code
 print dir(self.axes) # see below the results of dir(self.axes)
and look for methods that have the right names. Or you can keep a
python shell open and use the python help system. If for example, at
the shell you do help(self.axes), you'll find
 Help on instance of Subplot:
 <matplotlib.axes.Subplot instance>
So self.axes is a Subplot instance. You can then import the Subplot
class and get much richer help by doing
 >>> from matplotlib.axes import Subplot
 >>> help(Subplot)=20=20
If you don't like working from the shell, head on over to the class
docs at http://matplotlib.sourceforge.net/classdocs.html and click on
the "axes" link and near the top of your screen you'll seen a link
that reads
 Subplot(SubplotBase, Axes)
That means the subplot class is derived from SubplotBase and Axes.
Click on Subplot, and read through the available methods. If you get
impatient, search the web page for "xlabel"
Good luck!
JDH
Python 2.3.3 (#2, Apr 13 2004, 17:41:29)
[GCC 3.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from matplotlib.figure import Figure
>>> fig =3D Figure()
>>> ax =3D fig.add_subplot(111)
>>> help(ax)
>>> dir(ax)
['__doc__', '__init__', '__module__', '_alpha', '_axisbg', '_cid', '_clipon=
', '_connected', '_contourHelper', '_contourLabeler', '_cursorProps', '_eve=
nts', '_frameon', '_get_lines', '_get_patches_for_fill', '_get_verts_in_dat=
a_coords', '_gridOn', '_hold', '_init_axis', '_label', '_lod', '_position',=
 '_send_xlim_event', '_send_ylim_event', '_set_artist_props', '_set_lim_and=
_transforms', '_sharex', '_sharey', '_transform', '_transformSet', '_visibl=
e', 'add_artist', 'add_collection', 'add_line', 'add_patch', 'add_table', '=
aname', 'artists', 'autoscale_view', 'axesPatch', 'axhline', 'axhspan', 'ax=
ison', 'axvline', 'axvspan', 'bar', 'barh', 'bbox', 'bottom', 'boxplot', 'c=
la', 'clabel', 'clear', 'clipbox', 'cohere', 'colNum', 'collections', 'conn=
ect', 'contour', 'contourf', 'csd', 'dataLim', 'disconnect', 'draw', 'error=
bar', 'figBottom', 'figH', 'figLeft', 'figW', 'figure', 'fill', 'fmt_xdata'=
, 'fmt_ydata', 'format_coord', 'format_xdata', 'format_ydata', 'get_alpha',=
 'get_axis_bgcolor', 'get_child_artists', 'get_clip_on', 'get_cursor_props'=
, 'get_figure', 'get_frame', 'get_images', 'get_label', 'get_legend', 'get_=
lines', 'get_position', 'get_transform', 'get_visible', 'get_xaxis', 'get_x=
gridlines', 'get_xlim', 'get_xscale', 'get_xticklabels', 'get_xticklines', =
'get_xticks', 'get_yaxis', 'get_ygridlines', 'get_ylim', 'get_yscale', 'get=
_yticklabels', 'get_yticklines', 'get_yticks', 'get_zorder', 'grid', 'has_d=
ata', 'hist', 'hlines', 'hold', 'images', 'imshow', 'in_axes', 'is_figure_s=
et', 'is_first_col', 'is_first_row', 'is_last_col', 'is_last_row', 'is_tran=
sform_set', 'ishold', 'left', 'legend', 'legend_', 'lines', 'loglog', 'numC=
ols', 'numRows', 'panx', 'pany', 'patches', 'pcolor', 'pcolor_classic', 'pi=
ck', 'pie', 'plot', 'plot_date', 'psd', 'quiver', 'right', 'rowNum', 'scale=
d', 'scatter', 'scatter_classic', 'semilogx', 'semilogy', 'set_alpha', 'set=
_axis_bgcolor', 'set_axis_off', 'set_axis_on', 'set_clip_box', 'set_clip_on=
', 'set_cursor_props', 'set_figure', 'set_frame_on', 'set_label', 'set_lod'=
, 'set_position', 'set_title', 'set_transform', 'set_visible', 'set_xlabel'=
, 'set_xlim', 'set_xscale', 'set_xticklabels', 'set_xticks', 'set_ylabel', =
'set_ylim', 'set_yscale', 'set_yticklabels', 'set_yticks', 'set_zorder', 's=
pecgram', 'spy', 'spy2', 'stem', 'table', 'tables', 'text', 'texts', 'title=
', 'toggle_log_lineary', 'top', 'transAxes', 'transData', 'update', 'update=
_datalim', 'update_datalim_numerix', 'update_from', 'viewLim', 'vlines', 'x=
axis', 'yaxis', 'zoomx', 'zoomy', 'zorder']
>>>

ok, so i've done plotting two list on boa/wxpython
now, i want to add labels and everything else to my graph...
adding labels i've done this:
 self.figure = Figure()
 self.axes = self.figure.add_subplot(111)
 
 self.axes.plot(parent.listX,parent.listY, 'bo')
 
 self.axes.xlabel(parent.Xaxis.GetStringSelection())
 self.axes.ylabel(parent.Xaxis.GetStringSelection())
 
 self.canvas = FigureCanvas(self, -1, self.figure)
===========================================
but i'm getting some error that says:
Traceback (most recent call last):
 File "E:\final docu\Folder4.2pssl2\wxFrame1.py", line 729, in
OnGraphOldFileButton
 wxFrame2.create(self).Show(true)
 File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 16, in create
 return wxFrame2(parent)
 File "E:\final docu\Folder4.2pssl2\wxFrame2.py", line 39, in __init__
 self.axes.xlabel(parent.Xaxis.GetStringSelection())
AttributeError: Subplot instance has no attribute 'xlabel'
==============================================
what should i do???

i'd just like to ask how to make a simple graph of two lists???
i've seen this in the tutorials...
a = self.fig.add_subplot(111)
t = numpy.arange(0.0,3.0,0.01)
s = numpy.sin(2*numpy.pi*t)
c = numpy.cos(2*numpy.pi*t)
a.plot(t,s)
a.plot(t,c)
=============
so if i am to plot two lists say listY[] and listX[], i should do this:
a.plot(listY, listX)
=============
please, any help will be greatly appreciated!

Hello,
I graph of weather data from a CGI script using the Agg backend only. The graph
is a common time vs. temperature 2D line plot. Since the graph plots
every n minutes, the lines on the graph tend to look pointed and not very
aesthetically pleasing (as many people have informed me.)
I did some research and found I needed to do curve fitting.
I'm trying to use 8th order polynomial fitting. I have found a sample on the
Web that shows how to use matplotlib to do a best-fit line from polyfit, but
I want a curve that follows the curve of weather temperature data.
I plot the data using a list of X-coordinates and a list of Y-coordinates.
I assume I can call polyfit with (x,y,8) for 8th order polynomial fitting.
However, I am not sure what to do with the results. I have tried to
translate the 1st order polyfit example for my needs but I don't think
I am using the polyfit data correctly.
Also, it has been suggested that a spline or Butterworth filter on the data
may yield more predictable results. I have found some of this functionality
in SciPy and a nifty module in a language called Octave. Would matplotlib
benefit from this?
Any assistance is much appreciated. I'm just starting out on this type of stuff
but it is fascinating to work with!
Thank you,
Brian

Kosta, 
> I'm trying to embed matplotlib on WX (which seems to work well for the 
> moment). I'd like to avoid the wx mainloop() by making it run in a 
> different thread than that of my main program.
> 
> The classical way of doing (using show() ) doesn't work. The
> first time, the figure becomes the main thread and my program
> stops running until I close the window. The second time I call
> it though, my program remains the main thread... Check the
> following code
Hmm, could you explain why you want to avoid the wx mainloop,
and what you mean by this. Do want wx to process events, right?
You say you're trying to embed matplotlib on WX, but the code
you posted doesn't do this. It uses pylab, which creates a wx
App and runs its mainloop when you do show(). My guess is that
you're probably start getting the behavior you expect once that
auto-created wxapp is killed.
A simple answer would be to not use pylab, and just use a
matplotlib FigureCanvas with wx. You'd have a mainloop then (I
don't see how you avoid that!!). You could start another thread
for non-GUI processing if you wanted, or *use* the mainloop's
events (timers or data-changing events) to update the plot.
Hope that helps,
--Matt

>>>>> "Jean-Michel" == Jean-Michel Philippe <jea...@ar...> writes:
 Jean-Michel> Yes I have but was a little bit disappointed since
 Jean-Michel> this nested expression fails (matplotlib 0.72):
 Jean-Michel> \rm{\acute{e}}
This was a parser bug in mathtext which is fixed in CVS. Be sure and
let me know when you encounter these kinds of problems since they are
usually easy to fix
While I was at it, I also implemented unicode support for the *Agg and
PS backends :-) If you have access to CVS, you may want to give it a
test drive. See examples/unicode_demo.py. CVS mirrors may lag.
 Jean-Michel> Believe me I would really be glad to participate to
 Jean-Michel> the matplotlib source code. Unfortunately I don't
 Jean-Michel> think I have the required skills (unless you know
 Jean-Michel> some introducing pages that could change my opinion?)
 Jean-Michel> and my company - a research centre - isn't mature
 Jean-Michel> enough to let us participate to open source :-(. It
 Jean-Michel> is even hard to make people accept open source
 Jean-Michel> software for everyday use... They don't feel secure
 Jean-Michel> if do not pay for!
If they are looking for someone to pay.... :-)
JDH

Jan,
On many lists, asking 'please help me' three times in under
twelve hours is liable to get you no help at all, and quite
possibly prevent people from helping you in the future. 
> could anyone show me how to incorporate this example on my GUI?
>
> what i want to do is to implement this in a wxPanel that is
> part of my wxFrame, but i am getting errors that says wxPanel
> instance has no attribute GetToolBar...
The embedding_in_wx*.py examples didn't help?? The code you
posted doesn't have a wxPanel or a wxFrame, so it's difficult to
say what the problem might be or what you actually want to do.
In general, you can put a FigureCanvasXXX on a wxPanel or
wxFrame. A simple example putting a figure on a wxPanel is
below. Hope that helps,
--Matt
import wx
from matplotlib.numerix import arange, sin, pi
from matplotlib.figure import Figure
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg
class PlotPanel(wx.Panel):
 def __init__(self,parent=None):
 wx.Panel.__init__(self,parent,-1)
 self.fig = Figure((5,4), 75)
 self.canvas = FigureCanvasWxAgg(self,-1,self.fig)
 self.axes = self.fig.add_axes([0.12,0.12,0.76,0.76])
 sizer = wx.BoxSizer(wx.VERTICAL)
 sizer.Add(self.canvas,1, wx.LEFT|wx.TOP)
 self.SetSizer(sizer) ; self.Fit()
 
 def plot(self,x,y):
 self.axes.cla()
 self.axes.plot(x,y)
class PlotFrame(wx.Frame):
 def __init__(self,parent=None):
 wx.Frame.__init__(self,parent,-1,'Frame')
 
 self.plotpanel = PlotPanel(self)
 sizer = wx.BoxSizer(wx.VERTICAL)
 sizer.Add(wx.StaticText(self, -1 , ' WX Matplotlib example ')
 ,0, wx.LEFT|wx.TOP)
 sizer.Add(self.plotpanel,1, wx.LEFT|wx.TOP)
 self.SetSizer(sizer) ; self.Fit()
 def plot(self,x,y):
 self.plotpanel.plot(x,y)
if __name__ == '__main__':
 app = wx.PySimpleApp()
 frame = PlotFrame()
 x = arange(0,10.0,0.025)
 y = sin(x*pi/2)
 frame.plot(x,y)
 frame.Show()
 app.MainLoop()

>>>>> "Laurent" == Laurent THIOUDELLET <lau...@la...> writes:
 Laurent> The error is reproduced hereafter:
 Laurent> In file included from src/_gtkagg.cpp:8:
 Laurent> /usr/include/pygtk-2.0/pygobject.h:124: error: expected
 Laurent> `,' or `...' before "typename"
 Laurent> /usr/include/pygtk-2.0/pygobject.h:131: error: expected
 Laurent> `,' or `...' before "typename" In file included from
This is a pygtk bug, discussed here:
 http://matplotlib.sourceforge.net/faq.html#PYGTK24
Search the matplotlib-users archive at
http://sourceforge.net/mailarchive/forum.php?forum_id=33405 for
"typename" for more specific information.
JDH

>>>>> "Jessika" == Jessika Chumak <eli...@ya...> writes:
 Jessika> hours = HourLocator() minutes = MinuteLocator() timeFmt =
 Jessika> DateFormatter('%H:%M')
 Jessika> ax.xaxis.set_major_locator(hours)
 Jessika> ax.xaxis.set_minor_locator(minutes)
 Jessika> ax.xaxis.set_minor_formatter(timeFmt)
 Jessika> ax.autoscale_view()
 Jessika> Am I too far off target here? Because I can't get it to
 Jessika> work.
 Jessika> I've also looked at the user's manual (5.4 example 2:
 Jessika> date ticking). Could someone please point me in the
 Jessika> right direction or provide an example of how it _should_
 Jessika> be done? Thank you in advance.
All of the date ticker locators accept ranges to indicate where you
want the ticks. See, eg,
http://matplotlib.sourceforge.net/matplotlib.dates.html#MinuteLocator
To tick every 5 minutes, just give the range of minutes you want
ticked
 loc = MinuteLocator(range(5,60,5)) # don't tick on 0 and 60
 loc = MinuteLocator(range(0,61,5)) # tick on 0 and 60 as well
The default is to tick on every minute...
JDH

Hello all,
I am trying to install matplotlib for Python 2.3 under Linux (Mandrake 10.1 
AMD64) and the installation fails while trying to perform the build command.
I checked for the prerequisite and all the recommended packages seem to be 
correctly installed.
I am unable to understand the compilation error as it does not look like a 
trivial error (include file missing, library not reachable, ....) and as my 
C++ and Python skills are yet very weak.
The error is reproduced hereafter:
[root@TigerBox matplotlib-0.73.1]# python setup.py build
running build
running build_py
running build_ext
building 'matplotlib.backends._gtkagg' extension
creating build/temp.linux-x86_64-2.3
creating build/temp.linux-x86_64-2.3/src
creating build/temp.linux-x86_64-2.3/CXX
gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -pipe -Wall -g -fPIC 
-I/usr/local/include -I/usr/include -Isrc -Iagg22/include -I. 
-I/usr/local/include -I/usr/include -I/usr/local/include/freetype2 
-I/usr/include/freetype2 -Isrc/freetype2 -Iagg22/include/freetype2 
-I./freetype2 -I/usr/local/include/freetype2 -I/usr/include/freetype2 
-I/usr/local/include -I/usr/include -I/usr/include/pygtk-2.0 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/gtk-2.0 
-I/usr/lib64/gtk-2.0/include -I/usr/X11R6/include -I/usr/include/atk-1.0 
-I/usr/include/pango-1.0 -I/usr/include/freetype2 
-I/usr/include/freetype2/freetype2 -I/usr/include/freetype2/freetype2/config 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include 
-I/usr/include/python2.3 -c CXX/IndirectPythonInterface.cxx -o 
build/temp.linux-x86_64-2.3/CXX/IndirectPythonInterface.o
gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -pipe -Wall -g -fPIC 
-I/usr/local/include -I/usr/include -Isrc -Iagg22/include -I. 
-I/usr/local/include -I/usr/include -I/usr/local/include/freetype2 
-I/usr/include/freetype2 -Isrc/freetype2 -Iagg22/include/freetype2 
-I./freetype2 -I/usr/local/include/freetype2 -I/usr/include/freetype2 
-I/usr/local/include -I/usr/include -I/usr/include/pygtk-2.0 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/gtk-2.0 
-I/usr/lib64/gtk-2.0/include -I/usr/X11R6/include -I/usr/include/atk-1.0 
-I/usr/include/pango-1.0 -I/usr/include/freetype2 
-I/usr/include/freetype2/freetype2 -I/usr/include/freetype2/freetype2/config 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include 
-I/usr/include/python2.3 -c CXX/cxxextensions.c -o 
build/temp.linux-x86_64-2.3/CXX/cxxextensions.o
gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -pipe -Wall -g -fPIC 
-I/usr/local/include -I/usr/include -Isrc -Iagg22/include -I. 
-I/usr/local/include -I/usr/include -I/usr/local/include/freetype2 
-I/usr/include/freetype2 -Isrc/freetype2 -Iagg22/include/freetype2 
-I./freetype2 -I/usr/local/include/freetype2 -I/usr/include/freetype2 
-I/usr/local/include -I/usr/include -I/usr/include/pygtk-2.0 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/gtk-2.0 
-I/usr/lib64/gtk-2.0/include -I/usr/X11R6/include -I/usr/include/atk-1.0 
-I/usr/include/pango-1.0 -I/usr/include/freetype2 
-I/usr/include/freetype2/freetype2 -I/usr/include/freetype2/freetype2/config 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include 
-I/usr/include/python2.3 -c CXX/cxx_extensions.cxx -o 
build/temp.linux-x86_64-2.3/CXX/cxx_extensions.o
./CXX/Extensions.hxx: In constructor 
`Py::PythonExtension<T>::PythonExtension() [with T = 
Py::ExtensionModuleBasePtr]':
CXX/cxx_extensions.cxx:92: instantiated from here
./CXX/Extensions.hxx:472: warning: right-hand operand of comma has no effect
gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -pipe -Wall -g -fPIC 
-I/usr/local/include -I/usr/include -Isrc -Iagg22/include -I. 
-I/usr/local/include -I/usr/include -I/usr/local/include/freetype2 
-I/usr/include/freetype2 -Isrc/freetype2 -Iagg22/include/freetype2 
-I./freetype2 -I/usr/local/include/freetype2 -I/usr/include/freetype2 
-I/usr/local/include -I/usr/include -I/usr/include/pygtk-2.0 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/gtk-2.0 
-I/usr/lib64/gtk-2.0/include -I/usr/X11R6/include -I/usr/include/atk-1.0 
-I/usr/include/pango-1.0 -I/usr/include/freetype2 
-I/usr/include/freetype2/freetype2 -I/usr/include/freetype2/freetype2/config 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include 
-I/usr/include/python2.3 -c src/mplutils.cpp -o 
build/temp.linux-x86_64-2.3/src/mplutils.o
gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -pipe -Wall -g -fPIC 
-I/usr/local/include -I/usr/include -Isrc -Iagg22/include -I. 
-I/usr/local/include -I/usr/include -I/usr/local/include/freetype2 
-I/usr/include/freetype2 -Isrc/freetype2 -Iagg22/include/freetype2 
-I./freetype2 -I/usr/local/include/freetype2 -I/usr/include/freetype2 
-I/usr/local/include -I/usr/include -I/usr/include/pygtk-2.0 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/gtk-2.0 
-I/usr/lib64/gtk-2.0/include -I/usr/X11R6/include -I/usr/include/atk-1.0 
-I/usr/include/pango-1.0 -I/usr/include/freetype2 
-I/usr/include/freetype2/freetype2 -I/usr/include/freetype2/freetype2/config 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include 
-I/usr/include/python2.3 -c CXX/cxxsupport.cxx -o 
build/temp.linux-x86_64-2.3/CXX/cxxsupport.o
gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -pipe -Wall -g -fPIC 
-I/usr/local/include -I/usr/include -Isrc -Iagg22/include -I. 
-I/usr/local/include -I/usr/include -I/usr/local/include/freetype2 
-I/usr/include/freetype2 -Isrc/freetype2 -Iagg22/include/freetype2 
-I./freetype2 -I/usr/local/include/freetype2 -I/usr/include/freetype2 
-I/usr/local/include -I/usr/include -I/usr/include/pygtk-2.0 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/gtk-2.0 
-I/usr/lib64/gtk-2.0/include -I/usr/X11R6/include -I/usr/include/atk-1.0 
-I/usr/include/pango-1.0 -I/usr/include/freetype2 
-I/usr/include/freetype2/freetype2 -I/usr/include/freetype2/freetype2/config 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include 
-I/usr/include/python2.3 -c src/_gtkagg.cpp -o 
build/temp.linux-x86_64-2.3/src/_gtkagg.o
In file included from /usr/include/python2.3/Python.h:8,
 from /usr/include/pygtk-2.0/pygobject.h:5,
 from src/_gtkagg.cpp:8:
/usr/include/python2.3/pyconfig.h:850:1: warning: "_POSIX_C_SOURCE" redefined
In file included from /usr/include/string.h:26,
 from /usr/lib64/gcc/x86_64-mandrake-linux-gnu/3.4.1/../../../../include/c++/3.4.1/cstring:51,
 from src/_gtkagg.cpp:1:
/usr/include/features.h:132:1: warning: this is the location of the previous 
definition
In file included from src/_gtkagg.cpp:8:
/usr/include/pygtk-2.0/pygobject.h:124: error: expected `,' or `...' before 
"typename"
/usr/include/pygtk-2.0/pygobject.h:131: error: expected `,' or `...' before 
"typename"
In file included from agg22/include/agg_vertex_sequence.h:23,
 from agg22/include/agg_vcgen_contour.h:20,
 from agg22/include/agg_conv_contour.h:23,
 from src/_backend_agg.h:13,
 from src/_gtkagg.cpp:11:
agg22/include/agg_array.h: In member function `agg::int8u* 
agg::pod_allocator::allocate(unsigned int, unsigned int)':
agg22/include/agg_array.h:581: warning: cast from pointer to integer of 
different size
error: command 'gcc' failed with exit status 1
I wonder if it can be due to x86_64 architecture or a wrong devel version in 
the required libs.
It would be a great help if someone could give me a few advices or an idea 
about how to yank out this nasty mess.
I thank you in advance for your contribution and feel sorry for my bad 
english,
Laurent
PS: I successfuly built gtk, pygtk, numarray, OpenGL for my python 2.3

please, help me on this!
On 2005年3月29日 10:11:20 -0800, Jan Rienyer Gadil <jr...@gm...> wrote:
> any help will be very much appreciated...
> or could you suggest a better implementation of this graphing part
> 
> 
> On 2005年3月29日 08:54:06 -0800, Jan Rienyer Gadil <jr...@gm...> wrote:
> > could anyone show me how to incorporate this example on my GUI?
> >
> > what i want to do is to implement this in a wxPanel that is part of my
> > wxFrame, but i am getting errors that says wxPanel instance has no
> > attribute GetToolBar...
> >
> > how am i going to get around with this???
> >
> > actually, i am doing this because i'm making a graph based on some
> > data stored on a list. what i am thinking is to just replace t,s,and c
> > part of this example with my group of list :
> >
> > def plot_data(self):
> > # Use ths line if using a toolbar
> > a = self.fig.add_subplot(111)
> >
> > # Or this one if there is no toolbar
> > #a = Subplot(self.fig, 111)
> >
> > t = numpy.arange(0.0,3.0,0.01)
> > s = numpy.sin(2*numpy.pi*t)
> > c = numpy.cos(2*numpy.pi*t)
> > a.plot(t,s)
> > a.plot(t,c)
> > self.toolbar.update()
> >
> > please, i need help asap...
> >
>

Hi,
I'm trying to embed matplotlib on WX (which seems to work well for the=20
moment). I'd like to avoid the wx mainloop() by making it run in a=20
different thread than that of my main program.
The classical way of doing (using show() ) doesn't work. The first time,=20
the figure becomes the main thread and my program stops running until I=20
close the window. The second time I call it though, my program remains=20
the main thread... Check the following code
import threading
import matplotlib
matplotlib.use('WX')
from matplotlib.pylab import *
def f():
 fig =3D Figure(figsize=3D(8,6))
 data =3D range(10)
 plot(data)
 show()
f()
print 'here'
f()
print 'here'
f()
The screen prints 'here' only after closing the figure with the mouse.=20
Then second figure appears, but the screen prints 'end' without me=20
having to close the figure like the first one. The third figure though=20
does not appear at all!
What am I doing wrong? I know I can use the show command only once, but=20
my program runs sequently and I need to plot data while it runs. I also=20
tried to run this function in a different thread but the results are=20
similar :
t =3D threading.Thread(target =3D f)
t.start()
print 'here'
tt =3D threading.Thread(target =3D f)
tt.start()
print 'end'
If the last three lines are neglected (plot only once), then it works=20
perfectly! My main program terminates its execution and the figure stays=20
alive until I close it. When f() is called two times though, both=20
windows close when my program terminates...
Does anyone have an idea of how I should do this?
Thanks in advance,
Kosta
PS: I also ttried the example embedding-in-wx-2.py which seems to be=20
exactly my case for embedding my program in a GUI. The best would be=20
running that example in a different thread or something like that in=20
order to avoid the mainloop(). Any ideas?
--=20
Kosta Gaitanis
Laboratoire de T=E9l=E9communications et T=E9l=E9d=E9tection - TELE
Universit=E9 catholique de Louvain UCL - FSA / ELEC
B=E2timent Stevin, a.156
Place du Levant, 2
B-1348 Louvain-La-Neuve, Belgium
Tel: +32 10/47.80.75
e-mail: gai...@te...=20

any help will be very much appreciated...
or could you suggest a better implementation of this graphing part
On 2005年3月29日 08:54:06 -0800, Jan Rienyer Gadil <jr...@gm...> wrote:
> could anyone show me how to incorporate this example on my GUI?
> 
> what i want to do is to implement this in a wxPanel that is part of my
> wxFrame, but i am getting errors that says wxPanel instance has no
> attribute GetToolBar...
> 
> how am i going to get around with this???
> 
> actually, i am doing this because i'm making a graph based on some
> data stored on a list. what i am thinking is to just replace t,s,and c
> part of this example with my group of list :
> 
> def plot_data(self):
> # Use ths line if using a toolbar
> a = self.fig.add_subplot(111)
> 
> # Or this one if there is no toolbar
> #a = Subplot(self.fig, 111)
> 
> t = numpy.arange(0.0,3.0,0.01)
> s = numpy.sin(2*numpy.pi*t)
> c = numpy.cos(2*numpy.pi*t)
> a.plot(t,s)
> a.plot(t,c)
> self.toolbar.update()
> 
> please, i need help asap...
>

>>>>> "Humufr" == Humufr <hu...@ya...> writes:
 Humufr> I obtain an error message when I tried to use the quiver
 Humufr> sample: Traceback (most recent call last): File
 Humufr> "quiver_demo.py", line 8, in ? quiver( X, Y, U, V, 0.2,
 Humufr> color=True ) File
 Humufr> "/usr/local/lib/python2.4/site-packages/matplotlib/pylab.py",
 Humufr> line 2105, in quiver ret = gca().quiver(*args, **kwargs)
 Humufr> File
 Humufr> "/usr/local/lib/python2.4/site-packages/matplotlib/axes.py",
 Humufr> line 894, in quiver if C: File
 Humufr> "/usr/local/lib/python2.4/site-packages/numarray/generic.py",
 Humufr> line 490, in __nonzero__ raise RuntimeError("An array
 Humufr> doesn't make sense as a truth value. Use any(a) or
 Humufr> all(a).") RuntimeError: An array doesn't make sense as a
 Humufr> truth value. Use any(a) or all(a).
Thanks for the report. Replace line 894 in axes.py
OLD:
 if C:
NEW
 if C is not None:
JDH