matplotlib-users — Discussion related to using matplotlib

Re: [Matplotlib-users] Matplotlib/Pylab... A Couple Of Problems...

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

>>>>> "andrea" == andrea gavana <and...@ti...> writes:

    andrea> No matter which is my choice, the window crashes and I get
    andrea> the usual XP message about sending error messages to
    andrea> Microsoft and so on. It is a strange exception, if I
    andrea> resize the window VERY slowly, there is no exception
    andrea> (usually).

There is a known bug in Agg on Windows XP that appears on repeated
draws (resizing does this) that causes a segmentation fault.  I've
only seen this in the context of draw markers (eg

  plot(x,y,'o') 

where 'o' is a plot marker symbol.  Do you have markers in your plot?

Unfortunately, even though I think I know where the bug is occurring,
I don't yet have a fix for it.  If it is too annoying, you may want to
roll back to 0.71 until I figure this one out.


    andrea> Problem 2: Considering always the keypress_demo.py, if I
    andrea> run it (without resizing the window ;-) ) and I press the
    andrea> key "g" (for the grid), the grid appears and suddenly
    andrea> disappears. I opened the keypress_demo.py and I commented
    andrea> out the draw() command (that follows the grid() command),
    andrea> and now the grid does not disappear. What could be the
    andrea> problem with draw()?!? I have to use it in my application,
    andrea> but I am not able to display the grid...


Oh, I get it :-)

the 'g' key is now a default part of matplotlib -- eg pressing 'g'
toggles the grid on any axes.  I wrote the keypress_demo before making
this behavior default, so what you see in the demo is that you toggle
grid two times in keypress_demo, once in the default axes handling,
and once in the demo.  And so it ends up turning it on and back off.
Time to update the demo!

    andrea> Thank your for every suggestion, and sorry for the long
    andrea> post.

Bug reports are always welcome -- thanks!

JDH

Re: [Matplotlib-users] PS Output from WXAGG / wxPython application

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

>>>>> "Eli" == Eli Glaser <eg...@se...> writes:

    Eli> Thanks...Originally I opened up the PS file in a text editor
    Eli> and saw lines of hex data - I assumed it was a raster version
    Eli> of the plot.  Now I see that hex data is describing the
    Eli> fonts, and there are standard vector descriptors at the end
    Eli> of the file.

That's right -- to support mathtext and font compatibility between the
raster formats and ps output, we embed the truetype font information
directly into the file.  Unfortunately, we haven't yet succeeded in
getting just the characters we need embedded in the file, and have to
dump the whole font file.  We have a couple of approaches to fix this,
and so the file size issue should get better in future releases.

The only rasters we embed in postscript are images you create with
imshow or figimage -- everything else is vector graphics.  

JDH

[Matplotlib-users] OS-X package for matplotlib 0.72.1

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

Hi all,

I've built a new matplotlib package for OS-X. Bob Ippolito has
graciously hosted it at:

http://pythonmac.org/packages/

This is an upgrade to matplotlib 0.72.1, and it should work with Agg, Wx
and Tk. I have not included PyGTK, as you need fink and/or darwinports 
to run PyGTK, and if you're running those, you can get matplotlib 
through them (I think). This version should work on an stock OS-X 10.3.*

You, or course, need Numeric or numarray (available on the same site), 
and TK or wxPython, if you want to use those back ends.

-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...

Re: [Matplotlib-users] suggestion: legend outside axes

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

>>>>> "James" == James Boyle <bo...@ll...> writes:


    James> My suggestion is that the options for legend location
    James> include an option 'outside right' to automate this process.

See Figure.legend or the pylab figlegend function which exposes it.
Should help...

JDH

[Matplotlib-users] suggestion: legend outside axes

[James B. <bo...@ll...>]

Often I plot a lot of lines and the legend obscures some of the curves, 
especially if I do not want to re-scale the axes to make room for the 
legend.

Taking my cue from what colorbar() does, I re-scale the figure and 
place the legend to the right of the plot. I have to dink around to 
make the
legend fit in this space but it works OK. This is also handy for 
contour plots that have the contours color mapped.
In the vertical I usually put the legend even with the top of the plot.

My suggestion is that the options for legend location include an option 
'outside right'  to automate this process.

--Jim

Re: [Matplotlib-users] PS Output from WXAGG / wxPython application

[Norm P. <nj...@nj...>]

>
> I guess my real question is: is it possible to save a matplotlib plot 
> in a vector-based format?
>
Sure, saving as ".svg" works just fine for me...

> Thanks,
>
> Eli
>
>
>
>
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

Re: [Matplotlib-users] scatter plot legend

[Rich D. <dr...@in...>]

On Mon, 7 Mar 2005, Jim Benson wrote:

>   I had that vertical text problem when i first used legend...until
> John showed me my error.
> 
> I think:
> 
> legend(('aLabel',), 'upper left')   
> notice that needed , after the 'aLabel'

Ah yes, the old tuple trick.  Duh.  Thanks.

Now the only question remains:  is there any way to put the marker
*symbol* itself into the legend too?  On a regular (non-scatter) plot's
legend that is taken care of automatically, but in a scatter plot the
'lines' can't be labeled (I think).

Thanks,
Rich 

Re: [Matplotlib-users] PS Output from WXAGG / wxPython application

[Eli G. <eg...@se...>]

>
> It does not save a bitmap of the image to a postscript file, but
> normal postscript commands.  The eps file is relatively large
> (at least compared to png) because it includes a large but fixed
> amount of font data.  Try adding another line to your plot or
> otherwise changing the contents of the plot, and you'll see size
> of the eps file change.

Thanks...Originally I opened up the PS file in a text editor and saw lines 
of
hex data - I assumed it was a raster version of the plot.  Now I see that 
hex
data is describing the fonts, and there are standard vector descriptors
at the end of the file.

Thanks again,

Eli 

Re: [Matplotlib-users] scatter plot legend

[Jim B. <jb...@se...>]

On Mon, 7 Mar 2005, Rich Drewes wrote:

> 
> Hello,
> 
> I'm looking for the cleanest way to put a sort of legend into a scatter
> plot.  I want a legend box that says "<blue circle> is something, <red
> square> is somethingelse" and so on.  However I can't seem to set line
> labels as I can with other kinds of plots, and for some reason legend for
> prints the text that I supply vertically (and of course it doesn't print
> the <blue circle> or whatever).
> 

Hi, 

  I had that vertical text problem when i first used legend...until
John showed me my error.

I think:

legend(('aLabel',), 'upper left')   
notice that needed , after the 'aLabel'

For more than one line label:

legend(('aLabel1', 'aLabel2', 'aLabel3'), 'upper left')

...i'm still several versions behind the current matplotlib
release, so i don't know if the syntax may be different now.

Hope this helps,

Jim

[Matplotlib-users] scatter plot legend

[Rich D. <dr...@in...>]

Hello,

I'm looking for the cleanest way to put a sort of legend into a scatter
plot.  I want a legend box that says "<blue circle> is something, <red
square> is somethingelse" and so on.  However I can't seem to set line
labels as I can with other kinds of plots, and for some reason legend for
prints the text that I supply vertically (and of course it doesn't print
the <blue circle> or whatever).

Any suggestions?  Just paste some text()?  (And if I do that, can I get it
to put a <blue circle> next to my label?)

Thanks to the developers of matplotlib and those who contribute support on
this list!

Rich

Re: [Matplotlib-users] PS Output from WXAGG / wxPython application

[Matt N. <new...@ca...>]

> > I dont think it is a bitmap, but I will let someone more
> > knowledgable speak to that.
> 
> Can anyone confirm or deny this?  It seems to me that it is
> saving out in a rasterized version encapsulated in the
> postscript format.  I tried saving a simple plot in both PNG
> and PS format - the PNG is 77 kb and the PS is 623 kb.  The
> plot only has 3 curves and a legend so I'm guessing its being
> rasterized in the PS format.
> 
> I guess my real question is: is it possible to save a
> matplotlib plot in a vector-based format?

It does not save a bitmap of the image to a postscript file, but
normal postscript commands.  The eps file is relatively large
(at least compared to png) because it includes a large but fixed
amount of font data.  Try adding another line to your plot or
otherwise changing the contents of the plot, and you'll see size
of the eps file change.

Cheers,

--Matt

Re: [Matplotlib-users] PS Output from WXAGG / wxPython application

[Eli G. <eg...@se...>]

>> savefig(*args, **kwargs)
>> SAVEFIG(fname, dpi=150, facecolor='w', edgecolor='w',
>>     orientation='portrait'):
>>
>>     Save the current figure to filename fname.  dpi is the resolution
>>     in dots per inch.
>>
>>     Output file types currently supported are jpeg and png and will be
>>     deduced by the extension to fname
>
> I agree that is a little misleading, but keep reading:
>
>    orientation is either 'landscape' or 'portrait' - not supported on
>    all backends; currently only on postscript output.
>
> savefig works for ps and eps, I use it all the time without changing 
> backends.
>

Ok I tried that out and I am able to save ps files without doing any backend 
switching.
Thanks for the tip!

>> Also I guess I'm not clear if saving to PS/EPS format actually creates a
>> line drawing/ vector image or
>> just creates a bitmap and encapsulates the bitmap in the PS/EPS format.
>> I'm looking to
>> be able to save as a line drawing or vector-type format.
>
> I dont think it is a bitmap, but I will let someone more knowledgable 
> speak to
> that.

Can anyone confirm or deny this?  It seems to me that it is saving out in a 
rasterized version
encapsulated in the postscript format.  I tried saving a simple plot in both 
PNG and PS format -
the PNG is 77 kb and the PS is 623 kb.  The plot only has 3 curves and a 
legend so I'm
guessing its being rasterized in the PS format.

I guess my real question is: is it possible to save a matplotlib plot in a 
vector-based format?

Thanks,

Eli

Re: [Matplotlib-users] matplotlib FC3 install problems (was Re: matplotlib Redhat 9.0 install problems)

[Rick M. <rm...@sa...>]

Thanks. That worked fine.

R.

On Mar 7, 2005, at 10:41 AM, Stephen Walton wrote:

> Rick Muller wrote:
>
>> First, let me tell you how jaw-droppingly-cool I think matplotlib is.
>
> Ditto.
>
>>
>> /usr/include/pygtk-2.0/pygobject.h:140: error: expected `,' or `...'  
>> before "typename"
>> /usr/include/pygtk-2.0/pygobject.h:147: error: expected `,' or `...'  
>> before "typename"
>
> Old known problem with these include files, fixed at some more recent 
> version of pygtk.  'typename' is now a reserved word and so can't be 
> used as a variable name.  Edit the above two lines and change 
> 'typename' to '_typename' manually and you'll have no trouble building 
> matplotlib on FC3.  Heck that's what a lot of us are running.
>
>
>
Rick Muller - rm...@sa... - http://www.cs.sandia.gov/~rmuller
Computational Materials and Molecular Biology
Sandia National Laboratories
PO Box 5800, M/S 1110
Albuquerque, NM  87185-1110

Re: [Matplotlib-users] Matplotlib/Pylab... A Couple Of Problems...

[Matt N. <new...@ca...>]

Hi Andrea,

The pylab interface is generally the non-Class-based approached,
suitable for small, procedural scripts.  Personally, I'd say
this is good for interactive use, 'one-time' scripts, and very
simple uses of matplotlib, but that's just my opinion: it seems
many people use pylab for more demanding apps.

But: you don't need to import pylab at all if you're creating a
matplotlib figure in a wxPython (or other) GUI.  And, for me at
least, toggling the grid and interacting with gui Events work
fine.  

If the embedding_in_wx*.py and the docs aren't enough, you may
find it useful to look at the wxPython plotting widget (MPlot)
I've been working on.  The code is currently at
   http://cars.uchicago.edu/~newville/Epics/Python/MPlot

This provides a simple wxPython Panel (and/or Frame) widget that
has simple plot() and oplot() methods.  This widget responds to
events for zoom, etc and several of the plot attributes (title,
labels, line symbol/color,etc) can be altered through the GUI, 
and you can export plot images and/or use the Printer interface. 

The documentation is scant but there are a couple examples and a
README.  I'm intending to improve the functionality and docs and
have at least one other person interested and helping out on
this.  Anyway, feel free to steal from this (that goes for
anyone else on the list as well!!).  Any suggestions for
improvement would be great.

Cheers,

--Matt

Re: [Matplotlib-users] Matplotlib/Pylab... A Couple Of Problems...

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

On Monday 07 March 2005 12:15 pm, and...@ti... wrote:
> Hello Darren & NG,
>
> >from pylab import ... is intended for interactive matplotlib plotting
> > sessions or scripting, with syntax very similar to Matlab. To see what it
> > is all
> >
> >about, try http://matplotlib.sourceforge.net/tutorial.html, and
> >http://matplotlib.sourceforge.net/pylab_commands.html
>
> I am not using Matplotlib/Pylab in interactive way. In my RC file the
> interactive option is switched off.
>
[...]
>
> I'm sorry, probably I don't catch your point... 

No, I think I did not catch yours. Disregard my last message.

-- 

Darren

Re: [Matplotlib-users] Matplotlib/Pylab... A Couple Of Problems...

[<and...@ti...>]

Hello Darren & NG,

>
>from pylab import ... is intended for interactive matplotlib plotting se=
ssions
>or scripting, with syntax very similar to Matlab. To see what it is all

>about, try http://matplotlib.sourceforge.net/tutorial.html, and 
>http://matplotlib.sourceforge.net/pylab_commands.html
>

I am not using Matplotlib/Pylab in interactive way. In my RC file the int=
eractive
option is switched off. 

>The example you are building from is the "Pythonic" object oriented inte=
rface,
>
>which is more suitable for writing applications than the pylab interface=
.

I'm sorry, probably I don't catch your point... I used embedding_in_wx.py=

because I am trying do embed a Matplotlib figure in a wxPanel on my appli=
cation.
It seems to me that this is the correct way to go. 
In my application, I am able to reproduce the strange behavior of the "gr=
id"
(pushing the "g" button or calling grid(True) doesn't change anything, th=
e
grid is deleted by Matplotlib).
Regarding the examples, either they are not designed to work with Matplot=
lib
0.72.1 or there is something strange happening somewhere (my PC? Matplotl=
ib?).

Andrea.

Re: [Matplotlib-users] Matplotlib/Pylab... A Couple Of Problems...

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

Hi Andrea,

On Monday 07 March 2005 11:54 am, and...@ti... wrote:
>
> I am following the embedding_in_wx.py example. If effect, I never use the
> syntaxes:
>
> from pylab import
> import pylab
>
> and so on. I just "copied" the embedding_in_wx.py module and I have adapted
> it for my purposes. This is my import section:
>
> from matplotlib import use as matuse
> matuse('WXAgg')
> from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as
> FigureCanvas from matplotlib.backends.backend_wx import
> NavigationToolbar2Wx
>
> from matplotlib.figure import Figure
>
> Pylab is not there... am I missing something else?

from pylab import ... is intended for interactive matplotlib plotting sessions 
or scripting, with syntax very similar to Matlab. To see what it is all 
about, try http://matplotlib.sourceforge.net/tutorial.html, and 
http://matplotlib.sourceforge.net/pylab_commands.html

The example you are building from is the "Pythonic" object oriented interface, 
which is more suitable for writing applications than the pylab interface.

-- 

Darren

Re: [Matplotlib-users] Matplotlib/Pylab... A Couple Of Problems...

[<and...@ti...>]

Hello Matt & NG,

>I get this (fast resizes will eventually crash python though not
>immediately) as well with keypress_demo.py, but not with
>embedding_in_wx.py or in my own class-based uses of WXAgg: they
>resize fine (and quickly)  without crashing.  It doesn't seem to
>be leaking memory, but it seems like it may be something
>specific to pylab.  I'm not very familiar with pylab, so I'm not
>sure of the details.
> 

I am not familiar with pylab too, so I don't know what may be the problem=
.

>I believe this behavior is common to other backends (the
>toggling occurs for me with the TkAgg backend too).  I'd guess
>that this example hasn't been updated to work with the newer
>approaches to pylab being "interactive".  Again, I'm not sure of
>the right fix, as I'm not familiar enough with the approach that
>starts with "from matplotlib.pylab import *"
>
>The keypress and resizing events work for me with WXAgg on
>WinXP.  Is it possible to meet your needs by following the
>embedding_in_wx.py examples instead of relying on pylab?
>

I am following the embedding_in_wx.py example. If effect, I never use the=

syntaxes:

from pylab import
import pylab

and so on. I just "copied" the embedding_in_wx.py module and I have adapt=
ed
it for my purposes. This is my import section:

from matplotlib import use as matuse
matuse('WXAgg')
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as Figure=
Canvas
from matplotlib.backends.backend_wx import NavigationToolbar2Wx

from matplotlib.figure import Figure

Pylab is not there... am I missing something else?

Thank you very much for your help.

Andrea.

Re: [Matplotlib-users] PS Output from WXAGG / wxPython application

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

On Monday 07 March 2005 11:36 am, Eli Glaser wrote:
> Darren,
>
> It was my impression that savefig() only supports jpeg and png format. 
>
> From the docs:
> http://matplotlib.sourceforge.net/matplotlib.pylab.html#-savefig
>
> savefig(*args, **kwargs)
> SAVEFIG(fname, dpi=150, facecolor='w', edgecolor='w',
>     orientation='portrait'):
>
>     Save the current figure to filename fname.  dpi is the resolution
>     in dots per inch.
>
>     Output file types currently supported are jpeg and png and will be
>     deduced by the extension to fname

I agree that is a little misleading, but keep reading:

    orientation is either 'landscape' or 'portrait' - not supported on
    all backends; currently only on postscript output.

savefig works for ps and eps, I use it all the time without changing backends.

>
>
> Also I guess I'm not clear if saving to PS/EPS format actually creates a
> line drawing/ vector image or
> just creates a bitmap and encapsulates the bitmap in the PS/EPS format. 
> I'm looking to
> be able to save as a line drawing or vector-type format.

I dont think it is a bitmap, but I will let someone more knowledgable speak to 
that.

-- 

Darren

Re: [Matplotlib-users] PS Output from WXAGG / wxPython application

[Eli G. <eg...@se...>]

Darren,

It was my impression that savefig() only supports jpeg and png format.  From 
the docs:
http://matplotlib.sourceforge.net/matplotlib.pylab.html#-savefig

savefig(*args, **kwargs)
SAVEFIG(fname, dpi=150, facecolor='w', edgecolor='w',
    orientation='portrait'):

    Save the current figure to filename fname.  dpi is the resolution
    in dots per inch.

    Output file types currently supported are jpeg and png and will be
    deduced by the extension to fname


Also I guess I'm not clear if saving to PS/EPS format actually creates a 
line drawing/ vector image or
just creates a bitmap and encapsulates the bitmap in the PS/EPS format.  I'm 
looking to
be able to save as a line drawing or vector-type format.

Thanks,

Eli

----- Original Message ----- 
From: "Darren Dale" <dd...@co...>
To: <mat...@li...>
Sent: Monday, March 07, 2005 10:52 AM
Subject: Re: [Matplotlib-users] PS Output from WXAGG / wxPython application


> Hi Eli,
>
> Have you tried simply calling savefig('file.eps')? You shouldnt need to 
> worry
> about switching backends.
>
> Darren
>
>
> On Monday 07 March 2005 10:37 am, Eli Glaser wrote:
>> Hello all,
>>
>> First let me say how much I appreciate matplotlib and the matplotlib
>> community.
>>
>> I currently have a wxPython application which embeds a matplotlib window
>> using the WXAgg backend.  I use this
>> application to generate plots based on some simple user inputs.  After I
>> get the plot looking the way I like, I have
>> a "Save Plot" button which basically calls
>> self.canvas.print_figure(filename,...).  This works great for saving to
>> JPG and PNG format.  What I'd like to do is be able to save to PS or EPS
>> format.  Is this possible?
>>
>> It seems like there is an switch_backend() function which might be of 
>> help.
>> Before I go down that route, I'd like to know
>> if it is possible to use the WXAgg backend for normal plotting to the
>> screen and then switch_backend(PS), redraw the
>> plot, save using print_figure() or savefig() to a *.ps file, and then
>> switch_backend(WXAgg) to resume interactive
>> plotting on the screen.
>>
>> Thanks,
>>
>> Eli
>>
>>
>>
>>
>>
>> -------------------------------------------------------
>> SF email is sponsored by - The IT Product Guide
>> Read honest & candid reviews on hundreds of IT Products from real users.
>> Discover which products truly live up to the hype. Start reading now.
>> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
> -- 
>
> Darren
>
>
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> 

Re: [Matplotlib-users] PS Output from WXAGG / wxPython application

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

Hi Eli,

Have you tried simply calling savefig('file.eps')? You shouldnt need to worry 
about switching backends.

Darren


On Monday 07 March 2005 10:37 am, Eli Glaser wrote:
> Hello all,
>
> First let me say how much I appreciate matplotlib and the matplotlib
> community.
>
> I currently have a wxPython application which embeds a matplotlib window
> using the WXAgg backend.  I use this
> application to generate plots based on some simple user inputs.  After I
> get the plot looking the way I like, I have
> a "Save Plot" button which basically calls
> self.canvas.print_figure(filename,...).  This works great for saving to
> JPG and PNG format.  What I'd like to do is be able to save to PS or EPS
> format.  Is this possible?
>
> It seems like there is an switch_backend() function which might be of help.
> Before I go down that route, I'd like to know
> if it is possible to use the WXAgg backend for normal plotting to the
> screen and then switch_backend(PS), redraw the
> plot, save using print_figure() or savefig() to a *.ps file, and then
> switch_backend(WXAgg) to resume interactive
> plotting on the screen.
>
> Thanks,
>
> Eli
>
>
>
>
>
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

-- 

Darren

[Matplotlib-users] PS Output from WXAGG / wxPython application

[Eli G. <eg...@se...>]

Hello all,

First let me say how much I appreciate matplotlib and the matplotlib 
community.

I currently have a wxPython application which embeds a matplotlib window 
using the WXAgg backend.  I use this
application to generate plots based on some simple user inputs.  After I get 
the plot looking the way I like, I have
a "Save Plot" button which basically calls 
self.canvas.print_figure(filename,...).  This works great for saving to
JPG and PNG format.  What I'd like to do is be able to save to PS or EPS 
format.  Is this possible?

It seems like there is an switch_backend() function which might be of help. 
Before I go down that route, I'd like to know
if it is possible to use the WXAgg backend for normal plotting to the screen 
and then switch_backend(PS), redraw the
plot, save using print_figure() or savefig() to a *.ps file, and then 
switch_backend(WXAgg) to resume interactive
plotting on the screen.

Thanks,

Eli

[Matplotlib-users] matplotlib FC3 install problems (was Re: matplotlib Redhat 9.0 install problems)

[Rick M. <rm...@sa...>]

First, let me tell you how jaw-droppingly-cool I think matplotlib is. I  
think I've used every plotting package for Python out there, and  
matplotlib is the best of them all. These are truly "publication  
quality" graphics. Congratulations on a wonderful package.

Now, being that cool, I want to install them everywhere. I found a  
binary version for the mac (although I would prefer to install from  
source...), but I'm having a hard time building on Fedora Core 3. The  
RH9 thread and the patch recommended therein was helpful, but I'm still  
getting a bug:

gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -g -pipe -m32  
-march=i386 -mtune=pentium4 -D_GNU_SOURCE -fPIC -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/lib/glib-2.0/include  
-I/usr/include/gtk-2.0 -I/usr/lib/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/config  
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  
-I/usr/include/python2.3 -c src/_gtkagg.cpp -o  
build/temp.linux-i686-2.3/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/lib/gcc/i386-redhat-linux/3.4.2/../../../../include/c++/3.4.2/ 
cstring:51,
                  from src/_gtkagg.cpp:1:
/usr/include/features.h:150:1: warning: this is the location of the  
previous definition
In file included from src/_gtkagg.cpp:8:
/usr/include/pygtk-2.0/pygobject.h:140: error: expected `,' or `...'  
before "typename"
/usr/include/pygtk-2.0/pygobject.h:147: error: expected `,' or `...'  
before "typename"
error: command 'gcc' failed with exit status 1



I just re-tried this with the CVS version (I note you've fixed the RH9  
bug therein), but this bug still occurs. Any suggestions? Thanks in  
advance for your help.

Rick


Rick Muller - rm...@sa... - http://www.cs.sandia.gov/~rmuller
Computational Materials and Molecular Biology
Sandia National Laboratories
PO Box 5800, M/S 1110
Albuquerque, NM  87185-1110

[Matplotlib-users] Matplotlib/Pylab... A Couple Of Problems...

[<and...@ti...>]

Hello NG,

    first of all, I would like to thank you a for your kind support. I ca=
me
across a couple of problems using Matplotlib/Pylab, and I would like to
ask if someone else has encountered them or if I am missing something.

First of all, I am on a WinXP, with:
- Python 2.3.4
- wxPython 2.5.3.1
- Numeric 23.7
- I use WXAgg
- Matplotlib/Pylab 0.72.1

Problem 1:
I have downloaded the examples at:
 
http://matplotlib.sourceforge.net/matplotlib_examples_0.72.zip

If, for example, I try to run the keypress_demo.py, and if I resize the
window "too fast" (but it's not really fast, is just a normal resize), I
get an unhandled exception like:

"An unhandled exception occurred. Press "Abort" to terminate the program,=

"Retry" to exit the program normally and "Ignore" to try to continue."

No matter which is my choice, the window crashes and I get the usual XP
message about sending error messages to Microsoft and so on. It is a stra=
nge
exception, if I resize the window VERY slowly, there is no exception (usu=
ally).

Problem 2:
Considering always the keypress_demo.py, if I run it (without resizing th=
e
window ;-) ) and I press the key "g" (for the grid), the grid appears and=

suddenly disappears. I opened the keypress_demo.py and I commented out th=
e
draw() command (that follows the grid() command), and now the grid does
not disappear. What could be the problem with draw()?!? I have to use it
in my application, but I am not able to display the grid...

Thank your for every suggestion, and sorry for the long post.

Andrea.

Re: [Matplotlib-users] Plottin A Single Point?!?

[kristen k. <co...@ya...>]

Hi Andrea
Data inputs in plot must be lists or arrays. So
instead of :
plot( x[i] , y[i] )
you must write
plot( [x[i]] , [y[i]] )

Kristen

--- and...@ti... wrote:
> Hello NG,
> 
>     I am trying to plot a series of point (in a
> wxPython window). Everything
> works if I plot all the points together, as:
> 
> myreference = plot(x, y, 'ko')
> 
> But I would like to plot 1 point at a time, and to
> keep a "plot reference"
> of every point, because I will have to be able to
> interact with every single
> point (and not with all of them) separately, using
> the mpl_connect functions.
> If I try to plot a single point, matplotlib/pylab
> returns me an error like:
> 
>   File "D:\MyProjects\globall\SummaryPanel.py", line
> 169, in CreateWellMap
>     mp = axdata.plot(xc[cc], yc[cc], "ko")
>   File
> "C:\Python23\Lib\site-packages\matplotlib\axes.py",
> line 2324, in
> plot
>     for line in self._get_lines(*args, **kwargs):
>   File
> "C:\Python23\Lib\site-packages\matplotlib\axes.py",
> line 276, in
> _grab_ne
> xt_args
>     yield self._plot_3_args(remaining, **kwargs)
>   File
> "C:\Python23\Lib\site-packages\matplotlib\axes.py",
> line 238, in
> _plot_3_
> args
>     assert(iterable(x))
> AssertionError
> 
> 
> Does anyone have a suggestion? Thank you very much.
> 
> Andrea.
> 
> 
> 
> 
>
-------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT
> Products from real users.
> Discover which products truly live up to the hype.
> Start reading now.
> http://ads.osdn.com/?ad_ide95&alloc_id396&op=click
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
>
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> 


	
		
__________________________________ 
Celebrate Yahoo!'s 10th Birthday! 
Yahoo! Netrospective: 100 Moments of the Web 
http://birthday.yahoo.com/netrospective/