matplotlib-users — Discussion related to using matplotlib

Re: [Matplotlib-users] zoom on

[Stephen W. <ste...@cs...>]

On Thu, 2004-09-02 at 01:33, Jean-Michel Philippe wrote:
> ste...@cs... wrote:
> > Zooming is available via the widgets at the bottom of the plot menu by
> > default.
>=20
> Ok but I would like to activate zooming for users within the program.=20

You want the initial graph to come up already zoomed in, is that it?

--=20
Stephen Walton <ste...@cs...>
Dept. of Physics & Astronomy, CSU Northridge

[Matplotlib-users] Re: Problems with series of plots

[Faust, M. <Mar...@sp...>]

Thanks John,

but it doesn't work the way I would like it. I changed the script a
little bit and added a hold, but there is a problem with the focus (with
matplotlib-0.62.4.win32-py2.3.exe).

from matplotlib.matlab import *
import EasyDialogs
from numarray import *

x =3D arange(400.)*0.01+1.
y =3D x**2*exp(x)

for i in range(3):
    clf()
    figure(i+1, figsize=3D(11.0,7.5))
    lines=3Dsemilogy(x, abs(y), 'r-')
    set(lines, 'linewidth', 2.0)
    title('test')
    xlabel('x')
    ylabel('y')
    grid('on')
    draw()
    fname =3D 'test' + str(i) +'.png'
    savefig(fname, dpi=3D250)
    hold(True)
    resp =3D EasyDialogs.AskYesNoCancel("Next ?", default=3D1)
    if resp =3D=3D 1:
        hold(False)
    else:
        hold(False)
show()

Anybody can help?

With matplotlib-0.61.0-numarray0.9-win32-py2.3 I have the desired
behaviour with the following script, although show is called several
times:

from numarray import *
from matplotlib.matlab import *

x =3D3D arange(400.)*0.01+1.
y =3D3D x**2*exp(x)

for i in range(3):
    clf()
    Figure(figsize=3D3D(11.0,7.5))
    lines=3D3Dsemilogy(x, abs(y), 'r-')
    set(lines, 'linewidth', 2.0)
    title('test')
    xlabel('x')
    ylabel('y')
    grid('on')
    fname =3D3D 'test' + str(i) +'.png'
    savefig(fname, dpi=3D3D250)
    show()

I want the possibility to have a look on each of the figures, e.g. zoom,
after they have been created.

Markus

Re: [Matplotlib-users] matplotlib-generated eps files and GSview

[Darren D. <dd...@co...>]

>
>Possible soln:
> http://sourceforge.net/mailarchive/forum.php?thread_id=5360593&forum_id=33405
>  
>
That's embarressing. I am 100% certain that I made that change the day I 
originally read the post, but for some reason I had to do it again today.
It's fixed. Thanks.

Darren

Re: [Matplotlib-users] matplotlib-generated eps files and GSview

[Alan G I. <ai...@am...>]

On Thu, 02 Sep 2004, Darren Dale apparently wrote:
> On XP, using MPL 0.61, I created an eps file, and tried to open it with
> GSview 4.6. I get a long message, the end of it is reproduced below.
> Strangely, Adobe Illustrator is able to load the same file, and if I
> save it as an eps from Illustrator, I can then open it with GSview. I
> dont have much experience in this area, and I can work around it, but I
> thought I should report the behavior.

Possible soln:
 http://sourceforge.net/mailarchive/forum.php?thread_id=5360593&forum_id=33405
 
hth,
 Alan Isaac

[Matplotlib-users] matplotlib-generated eps files and GSview

[Darren D. <dd...@co...>]

On XP, using MPL 0.61, I created an eps file, and tried to open it with 
GSview 4.6. I get a long message, the end of it is reproduced below. 
Strangely, Adobe Illustrator is able to load the same file, and if I 
save it as an eps from Illustrator, I can then open it with GSview. I 
dont have much experience in this area, and I can work around it, but I 
thought I should report the behavior.

Darren


--- Begin offending input ---
ve 870 def /uhookabove 871 def /Uhornacute 872 def

/uhornacute 873 def /Uhorngrave 874 def /uhorngrave 875 def 
/Uhornhookabove 876 def

/uhornhookabove 877 def /Uhorntilde 878 def /uhorntilde 879 def 
/Uhorndotbelow 880 def

/uhorndotbelow 881 def /glyph882 882 def /glyph883 883 def /Ydotbelow 
884 def

/ydotbelow 885 def /Yhookabove 886 def /yhookabove 887 def /Ytilde 888 def

/ytilde 889 def /dong 890 def /tildecomb 891 def /currency 892 def



end readonly def

FontName currentdict end definefont pop

%EndFont



18.000 36.000 translate

0 rotate

/figure_clip {0 0 576.000 720.000 clipbox} def

figure_clip

gsave



newpath [ [ 0 0 ] [  0 720 ] [  576 720 ] [  576 0 ] ] make-polygon

1.000 1.000 1.000 setrgbcolor

1.00000 setlinewidth

0 setlinejoin

2 setlinecap

gsr

1.000 1.000 1.000 setrgbcolor fill

grestore

gsave



newpath [ [ 72 72 ] [  72 367.200 ] [  532.800 367.200 ] [  532.800 72 ] 
] make-polygon

0.000 0.000 0.000 setrgbcolor

1.00000 setlinewidth

0 setlinejoin

2 setlinecap

gsr

1.000 1.000
--- End offending input ---
file offset = 22661
gsapi_run_string_continue returns -101

[Matplotlib-users] How to set frame size ? (more info)

[HotPop <pa...@ho...>]

Platform:  using XP, python 2.3.4, wx 2.5.1.5, matplotlib 0.61.0

Does anyone know how to set the frame size in example embedding_in_wx2.py ?
Apparently the FigureCanvas is overiding my attempt to set the
dimensions in the CanvasFrame's __init__.

Ray Pasco

[Matplotlib-users] How to set frame size ?

[HotPop <pa...@ho...>]

Does anyone know how to set the frame size in example  embedding_in_wx2.py ?
Apparently the FigureCanvas is overiding my attempt to set the 
dimensions in the CanvasFrame's __init__.

Ray Pasco

Re: [Matplotlib-users] zoom on

[Jean-Michel P. <jea...@ir...>]

ste...@cs... wrote:
> Zooming is available via the widgets at the bottom of the plot menu by
> default.

Ok but I would like to activate zooming for users within the program. 
The purpose is to display all the figures with the zoom activated by 
default because in this (small) application users always have to zoom.

JM.

Re: [Matplotlib-users] anim_tk.py fails

[John H. <jdh...@ac...>]

>>>>> "Gary" == Gary  <pa...@in...> writes:

    Gary> In revisiting an old project, I tried the example
    Gary> anim_tk.py.  On two different WinXP machines, a "ghost"
    Gary> window appears (can see right through it) and the following:

    Gary> ------------------------------------
    Gary> C:\Python23\Lib\site-packages\matplotlib\examples>python
    Gary> anim_tk.py elapsed 10.7944733008 Fatal Python error:
    Gary> PyEval_RestoreThread: NULL tstate

    Gary> This application has requested the Runtime to terminate it
    Gary> in an unusual way.  Please contact the application's support
    Gary> team for more information.
    Gary> -------------------------------------

    Gary> please embarrass me by pointing out that I've forgotten to
    Gary> install something obvious.

I'll have to take a look at this next week since I don't have access
to a win32 platform right now.  It seems to be running fine on linux.

    Gary> BTW, It's not possible to say thank you enough times.
    Gary> matplotlab/ipython/scipy is just a dream for scientific
    Gary> work.  I also add Maxima and Vpython (and TeX/LaTeX/ConTeXt)
    Gary> to my soup, fwiw.

Thanks, it's great to hear encouraging words. Fernando and I will be
meeting tonight with some of the numarray and scipy folks, and so
hopefully we can come up with some more fruitful areas to make this a
great platform.

Now if only people could learn spell matplotlib <wink>

JDH

Re: [Matplotlib-users] Problems with series of plots

[John H. <jdh...@ac...>]

>>>>> "Faust," == Faust, Markus <Mar...@sp...> writes:

    Faust,> Hi, I'm trying to plot a series of graphs

    Faust,> #!/usr/bin/python # -*- coding: UTF-8 -*-

    Faust,> # Dr. Markus Faust #
    Faust,> markus.faust@+>>no-spam<<+space.eads.net

    Faust,> from numarray import * from matplotlib.matlab import *

    Faust,> x = arange(400.)*0.01+1.  y = x**2*exp(x)

    Faust,> for i in range(3): clf() Figure(figsize=(11.0,7.5))
    Faust,> lines=semilogy(x, abs(y), 'r-') set(lines, 'linewidth',
    Faust,> 2.0) title('test') xlabel('x') ylabel('y') grid('on')
    Faust,> fname = 'test' + str(i) +'.png' savefig(fname, dpi=250)
    Faust,> show()

    Faust,> With matplotlib-0.61.0-numarray0.9-win32-py2.3 this works
    Faust,> as it should.  One plot windows occurs, I click it away
    Faust,> and the next occurs.

    Faust,> But with matplotlib-0.62.4.win32-py2.3.exe the program
    Faust,> behaves strange.  The first windows occurs and I can click
    Faust,> it away but the next windows can not be controlled
    Faust,> anymore. Is that anticipated?

    Faust,> I'm working on a Windows XP Prof. PC with Python 2.3.4 and
    Faust,> numarray 0.9.

show should be called only once per script -- see
http://matplotlib.sourceforge.net/faq.html#SLOW.

Try replacing the call to Figure(figsize=(11.0,7.5)) with 

figure(i+1, figsize=(11.0,7.5))

Figure is an API call and figure is a matplotlib interface call.  It
is dangerous and unpredictable to mix the 2.

Other comments: you don't need to import numarray if your matplotlib
numerix rc setting is 'numarray'  the matplotlib.matlab import will do
this for you

I've attached a modified (untested script below).  I'm on the road en
route to the SciPy conference, so will be mostly out of touch for a
few days.

Hope this helps,
JDH

from matplotlib.matlab import *

x = arange(400.)*0.01+1.
y = x**2*exp(x)

for i in range(3):
    clf()
    figure(i+1, figsize=(11.0,7.5))
    lines=semilogy(x, abs(y), 'r-')
    set(lines, 'linewidth', 2.0)
    title('test')
    xlabel('x')
    ylabel('y')
    grid('on')
    fname = 'test' + str(i) +'.png'
    savefig(fname, dpi=250)
show()

Re: [Matplotlib-users] use 'WX' ignored

[John H. <jdh...@ac...>]

>>>>> "HotPop" == HotPop  <pa...@ho...> writes:

    HotPop> Python 2.3.4 on XP , latest matplotlib The use 'WX'
    HotPop> command is being ignored and the examples always come up
    HotPop> in Tkinter.  Funny thing is, before the latest XP install
    HotPop> it used to work as advertized (same versions of
    HotPop> everything).  Also, matplotlib.get_backend() reports
    HotPop> correctly before and after the use command (tkagg before,
    HotPop> wx after), and the commandline -dWX works, though
    HotPop> sometimes incredibly slowly (for "tale of two subplots").
    HotPop> I've tried the wxpython embedding program using 2 splitter
    HotPop> windows in a recent mail thread, and that works, too.

    HotPop> Any ideas or ways to debug this ?

I assume you are using use *before* you import matplotlib.matlab?  Eg

import matplotlib
matplotlib.use('WX')
import matplotlib.matlab ...


ANd you are running your script from the shell.  In an IDE, if
matplotlib.matlab has already been imported, and you rerun your script
from the IDE, your 'use' calls will be w/o effect.  Thus it's
important to test from a shell (tough on win32, I know), or double
click the script to insure a new python interpreter.

I'm on the road en route to the SciPy conference, so will be mostly
out of touch for a few days....

Hope this helps,
JDH

Re: [Matplotlib-users] zoom on

[Stephen W. <ste...@cs...>]

On Wed, 2004-09-01 at 05:36, Jean-Michel Philippe wrote:

> I would like to activate the zoom tool on a figure after a plot,

http://matplotlib.sourceforge.net/tutorial.html#toolbar2

Zooming is available via the widgets at the bottom of the plot menu by
default.

-- 
Stephen Walton <ste...@cs...>
Dept. of Physics & Astronomy, Cal State Northridge

[Matplotlib-users] anim_tk.py fails

[Gary <pa...@in...>]

In revisiting an old project, I tried the example anim_tk.py.
On two different WinXP machines, a "ghost" window appears (can see right
through it)
and the following:

------------------------------------
C:\Python23\Lib\site-packages\matplotlib\examples>python anim_tk.py
elapsed 10.7944733008
Fatal Python error: PyEval_RestoreThread: NULL tstate

This application has requested the Runtime to terminate it in an unusual
way.
Please contact the application's support team for more information.
-------------------------------------

please embarrass me by pointing out that I've forgotten to install
something obvious.

BTW, It's not possible to say thank you enough times.
matplotlab/ipython/scipy is just a dream for scientific work.  I also
add Maxima and Vpython (and TeX/LaTeX/ConTeXt) to my soup, fwiw.

-gary

[Matplotlib-users] zoom on

[Jean-Michel P. <jea...@ir...>]

Hello,

I would like to activate the zoom tool on a figure after a plot, like 
'zoom on' does in Matlab. I guess it should be quite easy but I didn't 
find how to do. I saw a 'zoom' method for the 'NavigationToolbar2' class 
that seems to be what I am looking for but I don't how to use this...

Has someone already achieved this?

JM. Philippe

[Matplotlib-users] Problems with series of plots

[Faust, M. <Mar...@sp...>]

Hi,

I'm trying to plot a series of graphs

#!/usr/bin/python
# -*- coding: UTF-8 -*-

# Dr. Markus Faust
# markus.faust@+>>no-spam<<+space.eads.net

from numarray import *
from matplotlib.matlab import *

x =3D arange(400.)*0.01+1.
y =3D x**2*exp(x)

for i in range(3):
    clf()
    Figure(figsize=3D(11.0,7.5))
    lines=3Dsemilogy(x, abs(y), 'r-')
    set(lines, 'linewidth', 2.0)
    title('test')
    xlabel('x')
    ylabel('y')
    grid('on')
    fname =3D 'test' + str(i) +'.png'
    savefig(fname, dpi=3D250)
    show()

With matplotlib-0.61.0-numarray0.9-win32-py2.3 this works as it should.
One plot windows occurs, I click it away and the next occurs.=20

But with matplotlib-0.62.4.win32-py2.3.exe the program behaves strange.
The first windows occurs and I can click it away but the next windows
can not be controlled anymore. Is that anticipated?

I'm working on a Windows XP Prof. PC with Python 2.3.4 and numarray 0.9.

Regards
Markus

[Matplotlib-users] use 'WX' ignored

[HotPop <pa...@ho...>]

Python 2.3.4 on XP , latest matplotlib

The use 'WX' command is being ignored and the examples always come up in 
Tkinter.
Funny thing is, before the latest XP install it used to work as 
advertized (same versions of everything).
Also, matplotlib.get_backend() reports correctly before and after the 
use command (tkagg before, wx after),
and the commandline -dWX works, though sometimes incredibly slowly (for 
"tale of two subplots").
I've tried the wxpython embedding program using 2 splitter windows in a 
recent mail thread, and that works, too.

Any ideas or ways to debug this ?

Ray Pasco

[Matplotlib-users] ANN: matplotlib-0.62.4

[Todd M. <jm...@st...>]

Release Name: matplotlib-0.62.4

Notes:
What's new in matplotlib-0.62 -=20

You can read this in html with hyperlinks at
http://matplotlib.sf.net/whats.new.html.

  * interactive support in ipython http://ipython.scipy.org with
    ipython -pylab, which detects your backend and loads the
    appropriate interactive, threaded shell, as well as all of
    matplotlib.matlab and numerix.  Requires ipython-0.6.3.  Backend
    status summary: linux (all backends working), OSX (tkagg and gtk*
    work), win32 (tkagg only).  Thanks Fernando Perez!

  * Excellent improvements in log ticking and formatting.  You can now
    do log plots in any base with major and minor tick support.  You
    can easily customize the location of the minor ticks with the subs
    arguments.  Mathtext exponential labeling for log plots.  Thanks
    Darren Dale and Gregory Lielens.  See the new screenshot and
    example - http://matplotlib.sf.net/screenshots.html#log_shot and
    help for the semilogx, semilogy and loglog.

      # base 16 semilog x plot with minor ticks on the 2s, 4s and 8s
      semilogx(x,y, basex=3D16, subsx=3D[2,4,8])

  * Mathtext now more than 5x faster.  Thanks to Paul Mcguire for
    optimizations in both pyparsing and the matplotlib grammar!
    Warning, mathtext broken on python2.2.  We hope to fix this soon.

  * fltkagg backend - alpha.  Gregory Lielens submitted an fltkagg
    backend which requires CVS pyfltk.  Feedback please!

  * Bug fixes: fixed some image edge effects, a ttf read problem in
    backend_ps on win32, several errorbar problems, a HOME dir bug on
    win32, grid w/o args now toggle grid state, multiple imshows with
    different extents, markerface color as RGB tulple

Downloads at http://sourceforge.net/projects/matplotlib

-------------------------------------------------------------------------=
-------
Changes:
2004-08-30 matplotlib 0.62.4 released

2004-08-30 Fixed a multiple images with different extent bug,
           Fixed markerfacecolor as RGB tuple

2004-08-27 Mathtext now more than 5x faster.  Thanks to Paul Mcguire
           for fixes both to pyparsing and to the matplotlib grammar!
           mathtext broken on python2.2

2004-08-25 Exposed Darren's and Greg's log ticking and formatting
           options to semilogx and friends

2004-08-23 Fixed grid w/o args to toggle grid state - JDH

2004-08-11 Added Gregory's log patches for major and minor ticking

2004-08-18 Some pixel edge effects fixes for images

2004-08-18 Fixed TTF files reads in backend_ps on win32. =20

2004-08-18 Added base and subs properties for logscale plots, user
           modifiable using
           set_[x,y]scale('log',base=3Db,subs=3D[mt1,mt2,...]) - GL

2004-08-18 fixed a bug exposed by trying to find the HOME dir on win32
           thanks to Alan Issac for pointing to the light - JDH

2004-08-18 fixed errorbar bug in setting ecolor - JDH

2004-08-12 Added Darren Dale's exponential ticking patch

2004-08-11 Added Gregory's fltkagg backend
-------------------------------------------------------------------------=
-------Special numarray Note:The windows installers for the numarray =
version of=20
matplotlib will be unavailable until some time next=20
week due to the untimely death of Todd Miller's PC.

[Matplotlib-users] Re: WX and Boa Constructor

[Ray S. <rj...@bl...>]

 > I suggest you start with
 > 
<http://matplotlib.sourceforge.net/examples/embedding_in_wx2.py>http://matplotlib.sourceforge.net/examples/embedding_in_wx2.py 
and
 > perturb off of that.  I can"t take a close look at your code right
 > now, but this should get you started.
 >
 > Cheers,
 > JDH

Hi, and thanks for the reply.

The code was stripped out of embedding_in_wx.py; the version I have did not 
have embedding_in_wx2.py included... I upgraded to 
matplotlib-0.61.0.win32-py2.2

This (mostly) Boa generated code now does work similarly (no toolbar):
__________________________________________________________________
#Boa:Frame:wxFrame1

from wxPython.wx import *

from matplotlib.numerix import arange, sin, pi
import matplotlib
matplotlib.use('WX')
from matplotlib.backends.backend_wx import FigureCanvasWx as FigureCanvas
#from matplotlib.backends.backend_wx import NavigationToolbar2Wx
from matplotlib.figure import Figure
from wxPython.wx import *

def create(parent):
     return wxFrame1(parent)

[wxID_WXFRAME1] = map(lambda _init_ctrls: wxNewId(), range(1))

class wxFrame1(wxFrame):
     def _init_ctrls(self, prnt):
         # generated method, don't edit
         wxFrame.__init__(self, id=wxID_WXFRAME1, name='', parent=prnt,
               pos=wxPoint(66, 66), size=wxSize(391, 312),
               style=wxDEFAULT_FRAME_STYLE, title='wxFrame1')
         self.SetClientSize(wxSize(383, 285))

     def __init__(self, parent):
         self._init_ctrls(parent)

         self.SetBackgroundColour(wxNamedColor("WHITE"))

         self.figure = Figure()
         self.axes = self.figure.add_subplot(111)
         t = arange(0.0,3.0,0.01)
         s = sin(2*pi*t)

         self.axes.plot(t,s)
         self.canvas = FigureCanvas(self, -1, self.figure)

         self.sizer = wxBoxSizer(wxVERTICAL)
         self.sizer.Add(self.canvas, 1, wxLEFT | wxTOP | wxGROW)
         self.SetSizer(self.sizer)
         self.Fit()

     def OnPaint(self, event):
         self.canvas.draw()


Ray
http://rjs.org

[Matplotlib-users] python-matplotlib 0.62.4 && ipython 0.6.3 debian packages

[Vittorio P. <re...@em...>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hello,
I've packaged a new version of python-matplotlib and ipython, you can find my
packages at this address:

deb http://anakonda.altervista.org/debian packages/
deb-src http://anakonda.altervista.org/debian sources/

# apt-get install python-matplotlib python-matplotlib-doc ipython



P.S.
python-matplotlib-doc isn't complete because pydoc exits with a segfault when I
build documentation, I'm investigating on this...



- --
/Vittorio Palmisano/
Home Page: http://redclay.altervista.org
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.5 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFBNHZjpT6bvDtyXOIRAmdSAKCeCdL+LKWEoZe86XqGXaKpyGQUzwCfSWz6
fZPWvFkHuv40FVbpXdUUveo=
=mUTV
-----END PGP SIGNATURE-----
 

 

 --

 Email.it, the professional e-mail, gratis per te: http://www.email.it/f

 

 Sponsor:

 E' iniziata l'era del fax virtuale! Si chiama EmailFax IN e significa: affidabilità, semplicità, qualità e risparmio.

* Clicca per saperne di più

 Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=1570&d=31-8

[Matplotlib-users] python-matplotlib 0.62.4 && ipython 0.6.3 debian packages

[redclay <re...@em...>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hello,
I've packaged a new version of python-matplotlib and ipython, you can find my
packages at this address:

deb http://anakonda.altervista.org/debian packages/
deb-src http://anakonda.altervista.org/debian sources/

# apt-get install python-matplotlib python-matplotlib-doc ipython



P.S.
python-matplotlib-doc isn't complete because pydoc exits with a segfault when I
build documentation, I'm investigating on this...


- --
/Vittorio Palmisano/
Home Page: http://redclay.altervista.org
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.5 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFBNFq/pT6bvDtyXOIRAqLtAKCvofM7S4LEBD6grWC0zAkghzsCaQCgoV3T
q4+FEtMxwotTJ4MnW+JNrF0=
=3fLp
-----END PGP SIGNATURE-----

Re: [Matplotlib-users] WX and Boa Constructor

[John H. <jdh...@ac...>]

>>>>> "Ray" == Ray Schumacher <rj...@bl...> writes:

    Ray> Hi all, I've been looking at matplotlib, as I'm using
    Ray> wxPyPlot and want a bit more...

    Ray> Q1: Has anyone used matplotlib with Boa, and, as a Plug-in?


    Ray> Q2: In the code below, (and with/from the example) I'm trying
    Ray> to simply display a plot, no toolbar, sizer etc.  The canvas
    Ray> appears on the panel, but no plot appears. What am I missing?

I suggest you start with
http://matplotlib.sourceforge.net/examples/embedding_in_wx2.py and
perturb off of that.  I can't take a close look at your code right
now, but this should get you started.

Cheers,
JDH

Re: [Matplotlib-users] Bar charts with dates as X axis?

[John H. <jdh...@ac...>]

>>>>> "GHubert" == Hubert Hickman <hu...@tc...> writes:

    GHubert> Hello, I am trying to construct a plot that is a barchart
    GHubert> with the X-axis being dates.  I have used the plot_dates
    GHubert> to generated line plots that look great, however, other
    GHubert> than turning the dates into integers myself I cannot
    GHubert> figure out a way to do a barchart with dates as the
    GHubert> Xaxis.

    GHubert> Has anyone done one of these - I am using the wxPython
    GHubert> backend, if that matters.

I suggest you use integer (epoch) dates on the x axis of the bar as
provided by a datetime converter (see
http://matplotlib.sourceforge.net/matplotlib.dates.html) and then use
one of the many matplotlib datetime tick locators and formatters which
know how to format these epoch dates.  With any axes, you can set a
custom tick locator and/or formatter.  This is, in fact, what
plot_date does; see also
http://matplotlib.sourceforge.net/matplotlib.ticker.html and see the
examples (from http//matplotlib.sf.net/examples or in the matplotlib
src distribution in the examples subdir)

     custom_ticker1.py
     major_minor_demo1.py
and  major_minor_demo2.py

and take a look at the src code of the plot_date function in
matplotlib/axes.py for an example of using date tickers and
formatters.

Sorry I can't be of more help right now but I'm short on time; perhaps
someone else can provide a concrete example.

Cheers,
JDH

Re: [Matplotlib-users] graphic scale

[John H. <jdh...@ac...>]

>>>>> "Xavier" == Xavier MERIAUX <Me...@mr...> writes:

    Xavier> Hi, I am a new user of matplotlib.  I have already plot
    Xavier> some data whit it but, I can't find the way to control the
    Xavier> axis scales ...  I know how to define the min/max number
    Xavier> for each axis. Is it possible to define the intermediate
    Xavier> scale values ??  For example , the x - axis marks are
    Xavier> (automatically) choosen :0 , 0.2 , 0.4 , 0.6 , 0.8 , 1.0
    Xavier> Can I have instead the values 0, 0.5 , 1.0 written on the
    Xavier> axis ?

You can set the xticks with the following. 

  set(gca(), xticks=[0, 0.5 , 1.0])

If you haven't had a chance yet to read the tutorial at
http://matplotlib.sourceforge.net/tutorial.html, it should help
somewhat.    See the section "Controlling axes properties"

Cheers,
John Hunter

[Matplotlib-users] WX and Boa Constructor

[Ray S. <rj...@bl...>]

Hi all,

I've been looking at matplotlib, as I'm using wxPyPlot and want a bit more...

Q1: Has anyone used matplotlib with Boa, and, as a Plug-in?

Q2: In the code below, (and with/from the example) I'm trying to simply 
display a plot, no toolbar, sizer etc.
The canvas appears on the panel, but no plot appears. What am I missing?

Python 2.2
WX 2.4

Thanks,
Ray


wxFrame1.py:
_____________________________________________________________
#Boa:Frame:wxFrame1

from wxPython.wx import *
from wxPyPlot.wxPyPlot import PlotCanvas

import numarray

import matplotlib
matplotlib.use('WX')
from matplotlib.backends.backend_wx import FigureCanvasWx
from matplotlib.figure import Figure
from matplotlib.axes import Subplot

def create(parent):
     return wxFrame1(parent)

[wxID_WXFRAME1, wxID_WXFRAME1PANEL1,
] = map(lambda _init_ctrls: wxNewId(), range(2))

class wxFrame1(wxFrame):
     def _init_ctrls(self, prnt):
         # generated method, don't edit
         wxFrame.__init__(self, id=wxID_WXFRAME1, name='', parent=prnt,
               pos=wxPoint(0, 0), size=wxSize(406, 341),
               style=wxDEFAULT_FRAME_STYLE, title="Test embedded wxFigure")

         self.panel1 = wxPanel(id=wxID_WXFRAME1PANEL1, name='panel1',
               parent=self, pos=wxPoint(0, 0), size=wxSize(398, 314),
               style=wxTAB_TRAVERSAL)

     def __init__(self, parent):
         self._init_ctrls(parent)
         self.fig = Figure((5,4), 75)
         self.canvas = FigureCanvasWx(self.panel1, -1, self.fig)
         self.plot_data()

     def plot_data(self):
         a = Subplot(self.fig, 111)

         t = numarray.arange(0.0,3.0,0.01)
         s = numarray.sin(2*numarray.pi*t)
         c = numarray.cos(2*numarray.pi*t)
         a.plot(t,s)
         a.plot(t,c)

Re: [Matplotlib-users] default error bar color

[Chris B. <Chr...@no...>]

Gregory Lielens wrote:
>>Except that z-order and a z coordinate really are different, so we 
>>shouldn't use z, it will make it harder, not easier to add 3-plots in 
>>the future!
> 
> Are they? I think not, cause in 3D you can not control the order of
> "painting", this is done so that elements which are in the background
> are hidden by elements which are more close to the observer...

sure, for data elements, but what about legends, error bars, etc?

-Chris



-- 
Christopher Barker, Ph.D.
Oceanographer
                                     		
NOAA/OR&R/HAZMAT         (206) 526-6959   voice
7600 Sand Point Way NE   (206) 526-6329   fax
Seattle, WA  98115       (206) 526-6317   main reception

Chr...@no...