matplotlib-users — Discussion related to using matplotlib

[Matplotlib-users] saving variables from/for interactive python sessions

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

Hi Everyone,

This week I started looking into saving my work to a pickled file so I 
could reload them later and retain their names. In Matlab, all or some 
variables in a workspace can be saved to a .mat file, and it seems 
possible to do this with Python. comp.lang.python gave me some ideas, 
and I wonder if this would be useful to matplotlib.

The primary problems, as I see them, are:

1) all objects are not picklable
2) a variable's class must be defined before instantiating by unpickling
3) others that I am not aware of (well, there's always that)

Have you guys looked into a way to save variables from an interactive 
session? I'm sure there is an easier way; my not-too-Pythonic solution 
looks like:

import shelve
myvars = {}
for key in vars().keys():
    myvar = vars()[key]
    if str(type(myvar)) == "<type 'module'>": print "can't pickle <type 
'module'>"
    elif: str(type(myvar)) == "<type 'function'>": print "can't pickle 
<type 'function'>"
    elif: str(type(myvar)) == "<type 'unpicklable'>": print "can't 
pickle <type 'module'>"
    else: myvars.update({key:myvar})

s = shelve.open('myvars.mpl',protocol=-1)
s.update(myvars)
s.close()

and reloading the data:

import shelve
s = shelve.open('myvars.mpl')
for key in s.keys():
	try:
		vars().update({key:s[key]})
	except:
		print type(s[key]), ' is not currently defined.'

What do you think? A try/except PicklingError might be possiblem, but according to the pickling docs, an unspecified number of bytes may have been written to the file before the 
PicklingError exception is raised.

Also, is there any interest in saving figures as pickled objects, to be reloaded like Matlab's .fig files? 

Darren

-- 
Darren S. Dale
dd...@co...

PGP public key available

Re: [Matplotlib-users] plot dense and large arrays, AGG limit?

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

>>>>> "Jin-chung" == Jin-chung Hsu <hs...@st...> writes:

    Jin-chung> One would expect the following will fill up the plot
    Jin-chung> window:
    >>>> n=zeros(20000) n[::2]=1 plot(n)

    Jin-chung> The plot "stops" a little more than half way, as if it
    Jin-chung> "runs out of ink".

    Jin-chung> It happens on Linux as well as Solaris, using either
    Jin-chung> numarray and Numeric, and both TkAgg and GTKAgg, but
    Jin-chung> not GTK.  Is this due to some AGG limitation?

Hi Jin-chung,

This is indeed an agg problem.  It is not a limitation in the sense of
'n is too large'.  It looks like a bug in agg but it is too early to
say.

For example, this is OK

  >>> plot(n)
  >>> ax.set_ylim((-2,2))

as is 

 >>> plot(n, 'o')

or

  >>> plot(rand(20000))

Ie, the problem seems to occur when plotting solid lines where many of
the y values are similar, but is not a problem with the length of n,
per se.

I was able to reproduce the bug in pure agg c++ and posted to the agg
mailing list.  Maxim (agg author) is on vacation, but I suspect he'll
provide some insight when he returns.

Thanks for letting me know,
JDH

Re: [Matplotlib-users] subplots and forked show()

[Gregory L. <gre...@ff...>]

On Wed, 2004-07-28 at 14:11, John Hunter wrote:
> >>>>> "Mark" == Mark Engelhardt <ma...@st...> writes:
> 
>     Mark> Hi, I am not in interactive mode, I am writing scripts that
>     Mark> handle a bunch of data and then plot it all.  However, when
>     Mark> show() is called, the script stops and waits for all the
>     Mark> windows it opens to be closed before continuing.  What I was
>     Mark> hoping for was a way to have the plots be drawn in windows
>     Mark> that were no longer hooked into the script, such that the
>     Mark> script could continue running (to completion) regardless of
>     Mark> what happened to the open windows.  I did try 'draw()',
>     Mark> which does not appear to open any new windows.
> 
> Hi Mark, 
> 
> Thanks for the explanation.  Now I understand what you are trying to
> do.  You are right about draw, all it does is redraw an existing
> figure, eg if you have changed some data in it.


Hi,

I think I recall I observed the requested behavior (i.e. get hand back
in interractive window or script after a show()) in previous version of
matplotlib.
I remember this cause reproducing this non-blocking behavior of show()
has proven to be a little bit hard to reproduce when developing FltkAgg
backend (I have done it using thread, and it works, so a solution would
be to use this backend when it is integrated).
But with TkAgg and GTKAgg, cvs version, on linux, it does not work
anymore (i.e. show() do not return hand, as mentioned)
I tested some earlier version (0.54 on windows, TkAgg) to see if I have
so false souvenir, but it indeed work as Mark want (i.e. show() is
non-blocking )...So I guess something has changed in the show()
mechanism since, maybe to deal with the new event mechanism?

Best regards,

Greg.

Re: [Matplotlib-users] subplots and forked show()

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

>>>>> "Mark" == Mark Engelhardt <ma...@st...> writes:

    Mark> Hi, I am not in interactive mode, I am writing scripts that
    Mark> handle a bunch of data and then plot it all.  However, when
    Mark> show() is called, the script stops and waits for all the
    Mark> windows it opens to be closed before continuing.  What I was
    Mark> hoping for was a way to have the plots be drawn in windows
    Mark> that were no longer hooked into the script, such that the
    Mark> script could continue running (to completion) regardless of
    Mark> what happened to the open windows.  I did try 'draw()',
    Mark> which does not appear to open any new windows.

Hi Mark, 

Thanks for the explanation.  Now I understand what you are trying to
do.  You are right about draw, all it does is redraw an existing
figure, eg if you have changed some data in it.

You have to get a little bit into the GTK API / event handling
mechanism to do this right.  One way is to use the full blown gtk API
with matplotlib, as in examples/embedding_in_gtk*.py.

The easier way is to just use as much of the API as you need, and take
over the function of the backend 'show' function.  You'll be doing an
end run around the matplotlib.matlab figure manager, which means some
of these won't work (like gcf, close, etc.).  That's OK, because you
won't be using the matplotlib.matlab interface.  Do not import
matplotlib.matlab with this approach as the result is undefined!

There are a few things you need to do

  * Define function(s) / class(es) which create your figures

  * Define a main function which call these functions as necessary.
    Return False from this function

  * Add main to the gtk idle handler.  Returning False in 'main' will
    cause this function to be called only once.

  * Start the gtk mainloop yourself.  After gtk is started, your
    'main' function will be called and you're off to the races.

  * If there is something you want from matplotlib.matlab, say the
    'axis' command, just look at the src code to see how axis is
    implemented with the matplotlib API and make those calls yourself.

You may want to spend some time with the pygtk class reference at
http://www.pygtk.org/pygtk2reference/gtk-class-reference.html and the
matplotlib class reference at
http://matplotlib.sourceforge.net/classdocs.html.  In the example
below

  * canvas inherits from gtk.DrawingArea and
    backends.FigureCanvasGTK (which in turn derives from 
    backend_bases.FigureCanvasBase)

  * manager is a backends.backend_gtk.FigureManagerGTK
    which inherits from backend_bases.FigureManagerBase

  * manager.window is a gtk.Window() (you can also hide or close this
    window with pygtk API calls)

  * ax is a axes.Subplot which inherits from axes.Axes


Here is an example

#!/usr/bin/env python
import matplotlib
matplotlib.use('GTKAgg')
from matplotlib.backends.backend_gtkagg import new_figure_manager
from matplotlib.numerix import *
import gtk

def main(*args):

    manager1 = new_figure_manager(1)
    canvas1 = manager1.canvas
    fig1 = canvas1.figure
    ax1 = fig1.add_subplot(111)
    ax1.plot([1,2,3])
    manager1.window.show()  # non blocking

    manager2 = new_figure_manager(2)
    canvas2 = manager2.canvas
    fig2 = canvas2.figure
    ax2 = fig2.add_subplot(111)
    ax2.plot([6,5,4])
    manager2.window.show()
    return False

gtk.idle_add(main)
gtk.mainloop()

Re: [Matplotlib-users] subplots and forked show()

[Mark E. <ma...@st...>]

Hi,

I am not in interactive mode, I am writing scripts that handle a bunch 
of data and then plot it all.  However, when show() is called, the 
script stops and waits for all the windows it opens to be closed before 
continuing.  What I was hoping for was a way to have the plots be drawn 
in windows that were no longer hooked into the script, such that the 
script could continue running (to completion) regardless of what 
happened to the open windows.  I did try 'draw()', which does not 
appear to open any new windows.

In answer to your questions, here are the relevant lines from my 
.matplotlibrc:
backend      : GTKAgg    # the default backend
numerix      : numarray #Numeric   # Numeric or numarray
interactive  : False     # see 
http://matplotlib.sourceforge.net/interactive.htm

Thanks for everyone's help on subplot positioning (or avoidance ;)) - 
I'll take a look.

- Mark

On Jul 26, 2004, at 2:06 PM, John Hunter wrote:
>     Mark> 2.  Is there a way to make the 'show()' command execute so
>     Mark> that the script keeps running (instead of waiting for the
>     Mark> windows to be closed), and to have the output persist past
>     Mark> the end of the run?
>
> You should only call show once per script.  I repeat, you should only
> call show once per script -
> http://matplotlib.sourceforge.net/faq.html#SHOW
>
> matplotlib-0.60.2 has a "draw" command to force a canvas redraw.  This
> is non blocking.  Earlier versions allow you to do, equivalently,
> get_current_fig_manager().canvas.draw().  Does this do what you want?
> I am not sure what you are after when you write "have the output
> persist past the end of the run".  Launch the python interpreter?
>
> Please let me know what backend you are using and explain a bit more
> what it is you are trying to do.  Are you running in interactive mode?
>
> JDH
>

[Matplotlib-users] Re: subplots and forked show()

[Chris F. <cf...@th...>]

  > Which backend are you using?  Chris Fuller submitted a tk widget for
  > just this purpose -
  > http://sourceforge.net/mailarchive/message.php?msg_id=8901913.  It
  > would be fairly easy to port to other GUIs. It"s on the list of things
  > to do, but I haven"t had time.  Other than that, your best option is
  > to manually set the axes size, eg using the "axes" command or calling

the fig_layout.py module is quite agnostic w.r.t. backend, the included demo
(layout_demo.py) is where TkAgg is invoked. The only dependency is on the figure
object itself, so there should be no problem using this functionality with any
backend. The embedded documentation should get you started.

You may need to use matlab.gcf() to get this figure object, if you are not using
the object oriented interface (for instance, interactively)

Chris

Re: [Matplotlib-users] font problem on Mac OS X with GUI

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

>>>>> "Michael" == Michael Oevermann <mic...@tu...> writes:

    Michael> I have just installed the latest CVS version of
    Michael> matplotlib. The EPS/PS backend works well with latex
    Michael> commands and also the png backend, but the GUI does not
    Michael> work anymore.  When I ran any of the examples in the
    Michael> examples directory I get the message

    Michael> ** (simple_plot.py:5668): WARNING **: Cannot open font
    Michael> file for font Verdana 10

    Michael> ** (simple_plot.py:5668): WARNING **: FCannot open
    Michael> fallback font, nothing to do

    Michael> and python terminates. I have set the TTFPATH environment
    Michael> variable and I have added the correct font path in
    Michael> font_manager.py which didn't help.  After severe problems
    Michael> with the gtk and pygtk installation via fink I decided to
    Michael> do a manual installation by hand and everything compiled
    Michael> without any problems.

Hi Michael,

Sorry for the delay in getting back to you.  

I don't believe this error message is coming from matplotlib itself.
Rather, I think it's coming from your GUI.  If you GUI is trying to
load a font, that almost certainly means you are not using one of the
*Agg backends: TkAgg, GTKAgg or WXAgg.  Which backend are you trying
to use?  From your message I assume GTK.  If GTKAgg is an option for
you, this will likely cure your problem.

However, we would like to sort this out for plain vanilla GTK as well.
Here are a thread that might have some relevant information for you -

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&safe=off&threadm=FLkS.6Zc.13%40gated-at.bofh.it&rnum=3&prev=/groups%3Fnum%3D50%26hl%3Den%26lr%3D%26ie%3DUTF-8%26safe%3Doff%26q%3D%2522Cannot%2Bopen%2Bfallback%2Bfont%252C%2Bnothing%2Bto%2Bdo%2522%26btnG%3DSearch

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&safe=off&threadm=b6d06883.0301070805.64f48075%40posting.google.com&rnum=4&prev=/groups%3Fnum%3D50%26hl%3Den%26lr%3D%26ie%3DUTF-8%26safe%3Doff%26q%3D%2522Cannot%2Bopen%2Bfallback%2Bfont%252C%2Bnothing%2Bto%2Bdo%2522%26btnG%3DSearch

JDH

Re: [Matplotlib-users] subplots and forked show()

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

>>>>> "Mark" == Mark Engelhardt <ma...@st...> writes:

    Mark> Hi, Two quick little issues I haven't been able to figure
    Mark> out how to fix on my own so far:

    Mark> 1.  Is there an easy way to change the spacing between
    Mark> subplots, so that they aren't so crammed together?  It's
    Mark> none too pretty when the x-axis text for the upper plot is
    Mark> overlapping or even below the title for the lower plot.

Which backend are you using?  Chris Fuller submitted a tk widget for
just this purpose -
http://sourceforge.net/mailarchive/message.php?msg_id=8901913.  It
would be fairly easy to port to other GUIs. It's on the list of things
to do, but I haven't had time.  Other than that, your best option is
to manually set the axes size, eg using the 'axes' command or calling

  ax.set_position

    Mark> 2.  Is there a way to make the 'show()' command execute so
    Mark> that the script keeps running (instead of waiting for the
    Mark> windows to be closed), and to have the output persist past
    Mark> the end of the run?

You should only call show once per script.  I repeat, you should only
call show once per script -
http://matplotlib.sourceforge.net/faq.html#SHOW

matplotlib-0.60.2 has a "draw" command to force a canvas redraw.  This
is non blocking.  Earlier versions allow you to do, equivalently,
get_current_fig_manager().canvas.draw().  Does this do what you want?
I am not sure what you are after when you write "have the output
persist past the end of the run".  Launch the python interpreter?

Please let me know what backend you are using and explain a bit more
what it is you are trying to do.  Are you running in interactive mode?

JDH

[Matplotlib-users] subplots and forked show()

[Mark E. <ma...@st...>]

Hi,

Two quick little issues I haven't been able to figure out how to fix on 
my own so far:

1.  Is there an easy way to change the spacing between subplots, so 
that they aren't so crammed together?  It's none too pretty when the 
x-axis text for the upper plot is overlapping or even below the title 
for the lower plot.

2.  Is there a way to make the 'show()' command execute so that the 
script keeps running (instead of waiting for the windows to be closed), 
and to have the output persist past the end of the run?

Thanks,
Mark

[Matplotlib-users] plot dense and large arrays, AGG limit?

[Jin-chung H. <hs...@st...>]

One would expect the following will fill up the plot window:

>>> n=zeros(20000)
>>> n[::2]=1
>>> plot(n)

The plot "stops" a little more than half way, as if it "runs out of ink".

It happens on Linux as well as Solaris, using either numarray and Numeric,
and both TkAgg and GTKAgg, but not GTK.  Is this due to some AGG limitation?

JC Hsu

Re: [Matplotlib-users] Label text alignment problem?

[Bogdan M. <bog...@gm...>]

    Hi John,

    I'm sending the code as an attachement, as it is 215 lines long
and some of them could wrap. Some thoughts about the code: in order to
test it just modify the definitions of IMAGE_FILE and (maybe)
PRINT_DPI. Then start the program and use "print" and "preview" from
the "file" menu. The preview doesn't look like the original plot (at
least on the machines I tested it), and I don't know why. The colors
seem to be twisted or something in the preview. If somebody has any
clues about this, I'd be more than happy to know. However, this is
only a preview problem, the print itself looks fine. Don't expect the
code to run on the current "official" version of wxPython (2.5.1.5);
download the 2.5.2.2 test release (or a more recent version) from
http://starship.python.net/crew/robind/wxPython/daily/20040722/. Only
tested on WinXP and Win2000 with the WXAgg backend, I don't know
anything about the other platforms or backends, if someone else could
test this it would be great. This could certainly be improved by
telling the backend what wxDC it should use to draw the image on (thus
skipping the save image/load image step), but so far I believe this is
a good solution.
    John, I have some comments on the wx / wxAgg backends; I've been
able to totally eliminate the very annoying flicker that I got when
moving a window on a plot canvas. I guess that the dev list would be a
better place for these comments, right?

-- 
Bogdan

Re: [Matplotlib-users] Label text alignment problem?

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

>>>>> "Bogdan" == Bogdan Marinescu <bog...@gm...> writes:

    Bogdan>     Thank you, John. I thought I was lost to PyPlot too,
    Bogdan> but ... well, matplotlib is just too cool :) So I
    Bogdan> struggled a bit and I managed to get a print of the graph
    Bogdan> by first saving it to a file and then printing the
    Bogdan> file. It actually woks on wxPython 2.5.2.2, I don't expect
    Bogdan> it to work with 2.5.1.5. I imagine that some people will
    Bogdan> benefit from this code and I'd be more than happy to give
    Bogdan> my share to matplotlib. So please let me know how should I
    Bogdan> send my code. IF I should send it :) I'll do it tomorrow
    Bogdan> if everything is OK, I'm exhausted today.

Definitely send the code.  If it's not too big, just post it to the
list.  Pasting in the code is better than attachments because the
sourceforge archiver drops attachments (but be careful that the lines
don't wrap).  If the code is too long, you can send it to me and I'll
include a link to it on the web site.

Thanks,
John

Re: [Matplotlib-users] figsize in WXAgg

[Bogdan M. <bog...@gm...>]

Use this snapshot that John was kind enough to provide:

http://nitace.bsd.uchicago.edu:8080/files/share/matplotlib-0.61.0a.win32-py2.3.exe

It should fix your problem.

On Sun, 25 Jul 2004 15:51:27 -0400, Darren Dale <dd...@co...> wrote:
> Hi All,
> 
> If I use the WXAgg backend, and call figure(1,figsize=(x,y)), if x or y
> is bigger than the standard 8 and 6, the plot wont render and I get an
> unhandled win32 exception.
> 
> Darren
> 
> --
> Darren S. Dale
> dd...@co...
> 
> PGP public key available
> 
> 
> 
> 


-- 
Bogdan

[Matplotlib-users] figsize in WXAgg

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

Hi All,

If I use the WXAgg backend, and call figure(1,figsize=(x,y)), if x or y 
is bigger than the standard 8 and 6, the plot wont render and I get an 
unhandled win32 exception.

Darren

-- 
Darren S. Dale
dd...@co...

PGP public key available

Re: [Matplotlib-users] debian

[Charles R. T. <cha...@in...>]

On Mon, 19 Jul 2004, Malte Marquarding wrote:
MM>'apt-cache search matplotlib'  should give you the names of all the
MM>relevant matplotlib packages if you don't know them.


But oddly, for me, it doesn't. I only see the docs.

> apt-cache search matplotlib
python-matplotlib-doc - A python based gtk plotting system in a style
similar to matlab (documentation)
>

Strange. But if Malte can get them, it's probably not a problem with
mentors.net. Hrm....

-Charles

-- 
Charles R. Twardy                    www.csse.monash.edu.au/~ctwardy
Monash University                    sarbayes.org
Computer Sci. & Software Eng.        +61(3) 9905 5823 (w)  5146 (fax)

Allow the president to invade a neighboring nation, whenever he shall
deem it necessary to repel an invasion, ...  and you allow him to make
war at pleasure.                               --Abraham Lincoln

Re: [Matplotlib-users] Label text alignment problem?

[Bogdan M. <bog...@gm...>]

    Thank you, John. I thought I was lost to PyPlot too, but ... well,
matplotlib is just too cool :) So I struggled a bit and I managed to
get a print of the graph by first saving it to a file and then
printing the file. It actually woks on wxPython 2.5.2.2, I don't
expect it to work with 2.5.1.5. I imagine that some people will
benefit from this code and I'd be more than happy to give my share to
matplotlib. So please let me know how should I send my code. IF I
should send it :) I'll do it tomorrow if everything is OK, I'm
exhausted today.

On Fri, 23 Jul 2004 14:25:31 -0500, John Hunter
<jdh...@ac...> wrote:
> >>>>> "Bogdan" == Bogdan Marinescu <bog...@gm...> writes:
> 
>     Bogdan>     Hello again, I've created some axes, and I'm trying to
>     Bogdan> put some custom Ox tick labels on the axes. I would also
>     Bogdan> like to have different alignments for each tick
>     Bogdan> label. This is the code I'm using (with matplotlib.0.61.0a
>     Bogdan> on Win32 with the WXAgg backend):
> 
> Hi, I thought we had lost you to PyPlot :-)
> 
> Egads, that was a tough one.  Every once in a while when developing
> I'll make a temporary change in the src code for experimental purposes
> and forget to undo it.  This is one of those cases.  In
> matplotlib.axis.XAxis, on or around line 575, find the line that reads
> 
>                 #tick = self._get_tick(major=True)
>                 tick = protoTick
> 
> and replace it with
> 
>                 tick = self._get_tick(major=True)
> 
> The assignment 'tick = protoTick' was causing all ticks to share
> properties.
> 
> FYI, matplotlib has a fairly general and extensible tick locator and
> formatter framework, which you can read about in
> http://matplotlib.sf.net/matplotlib.ticker.html and in the examples
> custom_ticker1.py, major_minor_demo1.py and major_minor_demo2.py in
> the matplotlib src distribution or at
> http://matplotlib.sf.net/examples.  The set_ticks, set_ticklabels,
> etc, commands are just wrappers for these classes.
> 
> JDH
> 
> 


-- 
Bogdan

Re: [Matplotlib-users] Label text alignment problem?

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

>>>>> "Bogdan" == Bogdan Marinescu <bog...@gm...> writes:

    Bogdan>     Hello again, I've created some axes, and I'm trying to
    Bogdan> put some custom Ox tick labels on the axes. I would also
    Bogdan> like to have different alignments for each tick
    Bogdan> label. This is the code I'm using (with matplotlib.0.61.0a
    Bogdan> on Win32 with the WXAgg backend):

Hi, I thought we had lost you to PyPlot :-)

Egads, that was a tough one.  Every once in a while when developing
I'll make a temporary change in the src code for experimental purposes
and forget to undo it.  This is one of those cases.  In
matplotlib.axis.XAxis, on or around line 575, find the line that reads

                #tick = self._get_tick(major=True)
                tick = protoTick

and replace it with 

                tick = self._get_tick(major=True)

The assignment 'tick = protoTick' was causing all ticks to share
properties.

FYI, matplotlib has a fairly general and extensible tick locator and
formatter framework, which you can read about in
http://matplotlib.sf.net/matplotlib.ticker.html and in the examples
custom_ticker1.py, major_minor_demo1.py and major_minor_demo2.py in
the matplotlib src distribution or at
http://matplotlib.sf.net/examples.  The set_ticks, set_ticklabels,
etc, commands are just wrappers for these classes.


JDH

[Matplotlib-users] Label text alignment problem?

[Bogdan M. <bog...@gm...>]

    Hello again,

     I've created some axes, and I'm trying to put some custom Ox tick
labels on the axes. I would also like to have different alignments for
each tick label. This is the code I'm using (with matplotlib.0.61.0a
on Win32 with the WXAgg backend):

        self.axes.set_xticks( [0, 1, 2, 3 ])
        th = self.axes.set_xticklabels( ['12:23:000', '+4s', '+8s', '+12s' ] )
        th[ 0 ].set_horizontalalignment( 'left' )
        th[ 1 ].set_horizontalalignment( 'center' )
        th[ 2 ].set_horizontalalignment( 'center' )
        th[ 3 ].set_horizontalalignment( 'right' )

    But it seems that all the tick labels have the last set alignment
(in this case 'right'). Is this a bug, or am I just missing something
as usual?
    Thank you.

-- 
Bogdan

Re: [Matplotlib-users] imshow with different axes

[Jeffery D. C. <Jef...@ve...>]

I grabbed the CVS version and it works fine.  Thanks for the help!


On Thursday 22 July 2004 12:45 pm, John Hunter wrote:
> >>>>> "Jeffery" == Jeffery D Collins <Jef...@ve...> writes:
>
>     Jeffery> I'm getting an unexpected keyword error on 'extent'.  Is
>     Jeffery> this keyword available in the latest release or just in
>     Jeffery> CVS?
>
> I must be getting soft in the head.  I thought this was in the 0.60.2
> release, but you're right, it is not.  Just checked the CHANGELOG.
> There is a way to do it in 0.60.2, but it is deprecated in CVS.
> Arggg.
>
> Your choices
>
>   * wait for 0.61 (next week)
>
>   * build from CVS - best solution.  Fixes some problems with image
>     extent plus image.origin='lower' reported earlier on
>     matplotlib-users.
>
>   * use the (deprecated in CVS/0.61)
>
>      im = imshow(A)
>      gca().set_image_extent(0, 25, 0, 25)
>
> Sorry for the confusions,
> JDH

-- 
-----------------------------------------------------------------
Jeffery D. Collins, Ph.D.                      Vexcel Corp.
Sr. Engineer                                   1690 38th St.
Voice: (303)583-0228                           Boulder, CO 80301
Fax:   (303)583-0246                           vexcel.com

Re: [Matplotlib-users] imshow with different axes

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

>>>>> "Jeffery" == Jeffery D Collins <Jef...@ve...> writes:

    Jeffery> I'm getting an unexpected keyword error on 'extent'.  Is
    Jeffery> this keyword available in the latest release or just in
    Jeffery> CVS?

I must be getting soft in the head.  I thought this was in the 0.60.2
release, but you're right, it is not.  Just checked the CHANGELOG.
There is a way to do it in 0.60.2, but it is deprecated in CVS.
Arggg.

Your choices

  * wait for 0.61 (next week)

  * build from CVS - best solution.  Fixes some problems with image
    extent plus image.origin='lower' reported earlier on
    matplotlib-users.

  * use the (deprecated in CVS/0.61)
    
     im = imshow(A)
     gca().set_image_extent(0, 25, 0, 25)

Sorry for the confusions,
JDH    
    

Re: [Matplotlib-users] imshow with different axes

[Jeffery D. C. <Jef...@ve...>]

On Thursday 22 July 2004 12:03 pm, John Hunter wrote:
> >>>>> "Jeffery" == Jeffery D Collins <Jef...@ve...> writes:
>
>     Jeffery> Is there a (convenient) matplotlib(v0.60.2) equivalent to
>     Jeffery> the matlab imshow(x,y,A), where x and y are 2-tuples
>     Jeffery> consisting of the bounds of the x and y axes,
>     Jeffery> respectively?  I have done some limited axis manipulation
>     Jeffery> using the set_xticklabels and set_yticklabels methods,
>     Jeffery> but that results in an unattractive plot.
>

I'm getting an unexpected keyword error on 'extent'.  Is this keyword 
available in the latest release or just in CVS?

> If I am understanding you correctly
>
>   >>> imshow(A, extent=(xmin, ymin, xmax, ymax))
>
> See also http://matplotlib.sf.net/matplotlib.matlab.html#-imshow and
> http://matplotlib.sf.net/examples/image_demo2.py.
>
> Hope this helps,
> JDH

-- 
-----------------------------------------------------------------
Jeffery D. Collins, Ph.D.                      Vexcel Corp.
Sr. Engineer                                   1690 38th St.
Voice: (303)583-0228                           Boulder, CO 80301
Fax:   (303)583-0246                           vexcel.com

Re: [Matplotlib-users] imshow with different axes

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

>>>>> "Jeffery" == Jeffery D Collins <Jef...@ve...> writes:

    Jeffery> Is there a (convenient) matplotlib(v0.60.2) equivalent to
    Jeffery> the matlab imshow(x,y,A), where x and y are 2-tuples
    Jeffery> consisting of the bounds of the x and y axes,
    Jeffery> respectively?  I have done some limited axis manipulation
    Jeffery> using the set_xticklabels and set_yticklabels methods,
    Jeffery> but that results in an unattractive plot.

If I am understanding you correctly

  >>> imshow(A, extent=(xmin, ymin, xmax, ymax))

See also http://matplotlib.sf.net/matplotlib.matlab.html#-imshow and
http://matplotlib.sf.net/examples/image_demo2.py.

Hope this helps,
JDH

[Matplotlib-users] News (well, almost) abour printing

[Bogdan M. <bog...@gm...>]

    Hello,

     I talked to the wxPython guys, asking them what's up with the
printing problems. They were very helpful. They gave me a link to an
unofficial build and I installed it. And now the print framework works
just fine, and more importantly, I'm able to print directly from
PyPlot without problems. So it seems that I'll stick with PyPlot after
all. Even if I had to modify it quite a bit in order to add plot marks
and other things, and it's not even close to matplotlib when it comes
to features. It's not something I want to do, but I have to :( If
anybody is interested, this is the link to the unnoficial  wxPython
build:

    http://starship.python.net/crew/robind/wxPython/daily/20040717/

     Some API calls changed again ... unfortunately. But no too much.
     Hope this helps at least some of you. Again, thank you very much
for your help. I'll stick around here ... I'm sure that I'll find a
nice way to integrate matplotlib into my next product.

     Bogdan

[Matplotlib-users] imshow with different axes

[Jeffery D. C. <Jef...@ve...>]

Is there a (convenient) matplotlib(v0.60.2) equivalent to the matlab 
imshow(x,y,A), where x and y are 2-tuples consisting of the bounds of the x 
and y axes, respectively?  I have done some limited axis manipulation using 
the set_xticklabels and set_yticklabels methods, but that results in an 
unattractive plot.

Thanks!
-- 
Jeff

[Matplotlib-users] font problem on Mac OS X with GUI

[Michael O. <mic...@tu...>]

I have just installed the latest CVS version of matplotlib. The EPS/PS=20=

backend works
well with latex commands and also the png backend, but the GUI does not=20=

work anymore.
When I ran any of the examples in the examples directory I get the=20
message

** (simple_plot.py:5668): WARNING **: Cannot open font file for font=20
Verdana 10

** (simple_plot.py:5668): WARNING **: Cannot open fallback font,=20
nothing to do

and python terminates. I have set the TTFPATH environment variable and=20=

I have
added the correct font path in font_manager.py which didn't help.
After severe problems with the gtk and pygtk installation via fink I=20
decided to do a manual
installation by hand and everything compiled without any problems.

Thanks in advance for any help

Michael

-------------------------------------------------------
Michael Oevermann
Technische Universit=E4t Berlin
Institut f=FCr Energietechnik
Fasanenstr. 89, 10623 Berlin, Germany
Phone: +49 (0) 30 314 22452
Fax:      +49 (0) 30 314 22157
mailto: mic...@tu...
-------------------------------------------------------=