matplotlib-users — Discussion related to using matplotlib

Re: [Matplotlib-users] inverting y axis?

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

>>>>> "Andrew" == Andrew Straw <str...@as...> writes:

    Andrew> Again, a no brainer:

Glad you found the answer :-)

See also Fernando's matshow command in CVS.  The data scaling with
aspect='preserve' in imshow is currently broken -- the axes
coordinates on the shorter dimension are wrong and because of this
zoom to rect doesn't do what it should.  Fernando's command works
around this problem by creating a figure and axes with the proper
aspect ratio .  Currently, it only works with arrays, but you could
easily patch it to work with pil images as you did for imshow.

Cheers,
JDH

Re: [Matplotlib-users] inverting y axis?

[Andrew S. <str...@as...>]

Andrew Straw wrote:

>
> Now, on to determine how to plot an image with origin='upper' with the 
> extent going the other way...

Again, a no brainer:

(modifications to image_demo3.py)

w,h = lena.size
extent = 0,w,h,0
figure(figsize=figsize)

im = imshow(lena, origin='upper', aspect='preserve', extent=extent)

Re: [Matplotlib-users] inverting y axis?

[Andrew S. <str...@as...>]

Andrew Straw wrote:

> Simple question:  how can I plot something such that the y axis is 
> "inverted"?  (Increasing downwards?)

Simple answer:

ymin,ymax= get(gca(),'ylim')
set(gca(),'ylim',[ymax,ymin])

Now, on to determine how to plot an image with origin='upper' with the 
extent going the other way...

Cheers!
Andrew

[Matplotlib-users] inverting y axis?

[Andrew S. <str...@as...>]

Simple question:  how can I plot something such that the y axis is 
"inverted"?  (Increasing downwards?)

(I thought I'd better ask before fubaring my copy of mpl's transAxes, 
transData, bbox code and going insane in the process.)

Cheers!
Andrew

Re: [Pythonmac-SIG] Re: [Matplotlib-users] matplotlib OS-X binary problems.

[Robert K. <rk...@uc...>]

Chris Barker wrote:
> Robert Kern wrote:

>> Change the paths that distutils will add to the link line. They're at 
>> the top of setupext.py . Remove the ones you don't need.
> 
> 
> Except that the *.a and *.dylib are put in the same place. Darn.

Copy (and re-ranlib) the static library and headers to another place.

-- 
Robert Kern
rk...@uc...

"In the fields of hell where the grass grows high
  Are the graves of dreams allowed to die."
   -- Richard Harter

Re: [Pythonmac-SIG] Re: [Matplotlib-users] matplotlib OS-X binary problems.

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

John Hunter wrote:

> I do statically link png, freetype and zlib for win32 so that users
> don't have to install any of those prereqs.



Thanks John, I have a plan now.

I have a question, however. How do I get distutils to statically link a 
given lib? the only method I have now is to make sure that only the 
static lib is available. I can do that (for the moment) with libpng, but 
for freetype, I have a problem. In setupext.py, there is:

basedir = {
     'darwin' : ['/usr/local', '/usr', '/sw', '/usr/X11R6'],
}

There is a libfreetype in /usr/X11R6, but only if X11 is installed, so I 
don't want to use it. However, I imagine that /usr/X11R6 is required to 
the GTK build, so I can't take that out. Any ideas?

I notice that for win32, you have only:

basedir = {
     'win32'  : ['win32_static',],

Should I do that for darwin, and put my static libs in there?

I'm off to try some of this.


-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: [Pythonmac-SIG] Re: [Matplotlib-users] matplotlib OS-X binary problems.

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

>>>>> "Chris" == Chris Barker <Chr...@no...> writes:

    Chris> The question is: Can I build a binary version that will
    Chris> work with all the back ends, if they are there, but also
    Chris> work on what is there if they aren't all. This comes down
    Chris> to when the linking happens, I guess. Experimentation will
    Chris> answer this for me, but I welcome and insight any of you
    Chris> may have.

    Chris> One issue that has come up is libfreetype. If you have GTK,
    Chris> you have X11, so you have libfreetype. Indeed, I don't have
    Chris> GTK, but I do have X11, and the X11 freetype got linked to
    Chris> my package. I can probably fix this by removing
    Chris> "/usr/X11R6" from the basedir list for darwin. Then I'll
    Chris> have libfreetype statically linked to matplotlib, but
    Chris> PyGTK, if the user has it, will have a different version
    Chris> dynamically linked. Is this going to cause problems?

Here is what I do for the win32 which has some related issues.

matplotlib needs Tkinter and pygtk to be installed on your build
system in order to build the matplotlib extension code for those
modules.  But you do not need to statically link in any gtk or tk
library code.

I do statically link png, freetype and zlib for win32 so that users
don't have to install any of those prereqs.

Then they get a package that has Agg, PS, SVG out of the box
regardless of their system.  If they have pygtk on their system, they
also get GTK and GTKAgg.  If they have Tkinter, they also get
TkAgg. If they have wxpython, they also get WX, WXAgg.

The key is, if you want your package to be maximally usable, you
should have pygtk and tk (and the requisite devel stuff) and should
probably statically link freetype, png and zlib.

Of course there is now also a Cairo and GTKCairo backend, which may
interest some OSX X11 users, but I haven't had to worry about this for
win32 users.

And FLTK and QT ..., but we can save that for another day.  I think if you
have the tkagg extension compiled in, most OSX people will be happy
with either that or wxagg.

JDH

Re: [Pythonmac-SIG] Re: [Matplotlib-users] matplotlib OS-X binary problems.

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

Robert Kern wrote:
> Chris Barker wrote:
>> However, that doesn't seem to work if I have libfreetype.dylib 
>> somewhere standard, and I certainly don't want to remove it! (Maybe I 
>> could temporarily, but that's hardly the robust solution I'm looking for)
> 

> Change the paths that distutils will add to the link line. They're at 
> the top of setupext.py . Remove the ones you don't need.

Except that the *.a and *.dylib are put in the same place. Darn.

>> By the way, it would also be good to get this to work with TK and/or 
>> GTK. Has anyone done that successfully that would like to help out 
>> with this?

> With TclTkAqua, it Just Works.

Someone posted recently to the MacPython Mailing list with a series of 
questions that this was not the case, at least to for him. So I wasn't sure.

>> Also, as far as PyGTK is concerned. Can you run it without running 
>> Fink? That's the only way I've seen it done. If it is a Fink only 
>> option, then this is moot, as I'm looking for a Fink free approach, 
>> and someone else has put together a fink matplotlib package.

> You could try Darwinports. Set Darwinports' prefix to /usr/local, and 
> use port(1) to make Installer.app packages for GTK et al. Bundle them 
> with your bdist_mpkg metapackage.

Hmm. That sounds promising. However...

My immediate need to to get matplotlib installed on and OS-X Server box 
that someone else is administering. For this purpose, I only need the 
Agg back end. However, for my own purposes, I also want wx. The easiest 
way for me to accomplish my immediate goal is probably to just install 
all the libs needed on that server, but I'm trying to keep it simple for 
the admin, and I figured this could be a useful contribution to the 
MacPython community.

However, here is the complication. As long as I am doing this, I'd like 
to make it as useful as possible. That means it would be nice if I could 
come up with a single binary that works with all the available back ends 
on OS-X (Agg, wx, PyGTK, Tkinter). I also want people to be able to 
install it on a stock box and have it work. This doesn't mean that I 
want it to include PyGTK and TK, but it would be nice if it worked with 
those, if they were present.

The question is: Can I build a binary version that will work with all 
the back ends, if they are there, but also work on what is there if they 
aren't all. This comes down to when the linking happens, I guess. 
Experimentation will answer this for me, but I welcome and insight any 
of you may have.

One issue that has come up is libfreetype. If you have GTK, you have 
X11, so you have libfreetype. Indeed, I don't have GTK, but I do have 
X11, and the X11 freetype got linked to my package. I can probably fix 
this by removing "/usr/X11R6" from the basedir list for darwin. Then 
I'll have libfreetype statically linked to matplotlib, but PyGTK, if the 
user has it, will have a different version dynamically linked. Is this 
going to cause problems?

More as I make more progress...

-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] plot_date problem

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

>>>>> "Travis" == Travis Brady <td...@fa...> writes:

    Travis> Hi Everyone, I'm using plot_date to scatter a ton of data
    Travis> retrieved from a database and have encountered an error
    Travis> with the date ticks.

    Travis> I more or less copied the format of the example in
    Travis> http://matplotlib.sourceforge.net/examples/date_demo2.py
    Travis> and my ticks ended up being months in order but never
    Travis> making it past the year 2001 (they just recycle) though my
    Travis> data begin in 2000 and end in 2004.

    Travis> I took another look at the plot generated by date_demo2.py
    Travis> and it turns out that the same is true there.

    Travis> I'm thinking this is not intentional, but if so does
    Travis> anyone have any advice or example scripts that might help
    Travis> me fix my plot?

That's because the format string is printing 'month day' and not
'month year' and the day is always 01 in the example.  You might want

monthsFmt = DateFormatter("%b '%y")

Hope this helps,
JDH

[Matplotlib-users] Re: funny window behavior

[Steve C. <ste...@ya...>]

> On Wed, 2005-02-02 at 10:14 -0800, matplotlib-users-
> re...@li... wrote:
> > On Wednesday 02 February 2005 04:51 am, Steve Chaplin wrote:
> > >
> > > When resizing the FigureCanvas on my system I notice:
> > > GTK   sets a FigureCanvas size that can only be increased.
> > > QtAgg sets a FigureCanvas size that can be increased or decreased
> > > TkAgg sets a FigureCanvas size that can be increased or decreased to a
> > > minimum (of perhaps 400 x 300 pixels)
> > > Wx I do not have, is it like Qt or Tk or is there a 4th variation?
> > 
> > on linux, wx lets me increase or decrease all the way. I wonder if it is 
> > different on windows.
> > 
> > >
> > > I looked at changing GTK so the FigureCanvas could be decreased a while
> > > ago but the problem is that while the axes scale/shrink nicely the text
> > > stays the same size and becomes misaligned or clipped and gives an odd
> > > looking graph. Perhaps thats why Tk allows you shrink the window but
> > > only to a certain size.
> > >
> > > Matplotlib currently has 3 (or more) ways of handling window resizing,
> > > which one of these behaviours is 'correct' or most desirable?
> > >
> > 
> > I think the most desirable for interactive use would be to allow scaling, but 
> > if it doesn't scale properly, I think the current behavior is appropriate. I 
> > guess I just didnt notice it before now.
> > 
> > Darren
I've changed the GTK backends (in cvs) so they will now allow the window
to be resized smaller than the original size. Text still does not scale
down when the window shrinks, but if the matplotlib user wants a smaller
window they now have the option to resize the window.

Steve

[Matplotlib-users] Bug in polyfit/polyval

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

Hola

When i try to fit a polynomial of order 4 to 5 data
points, I get an answer far from what I would expect.
Try and run the attached script an see if you can fit
the datapoints in x and y better than me.
When I run the script, the fit doesn't go through any
of the points.
The problem is also present for higher order pol.

Kristen

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Re: [Matplotlib-users] matplotlib OS-X binary problems.

[Robert K. <rk...@uc...>]

And while we're on the subject of OS X builds, I have a request.

Can you add /usr/local/share/matplotlib to the list of default locations 
search for the data directory?

/System/Library/Frameworks/Python.framework/Versions/Current/share/matplotlib 
is not, I think a good place for it.

-- 
Robert Kern
rk...@uc...

"In the fields of hell where the grass grows high
  Are the graves of dreams allowed to die."
   -- Richard Harter

Re: [Matplotlib-users] matplotlib OS-X binary problems.

[Robert K. <rk...@uc...>]

Chris Barker wrote:

> However, that doesn't seem to work if I have libfreetype.dylib somewhere 
> standard, and I certainly don't want to remove it! (Maybe I could 
> temporarily, but that's hardly the robust solution I'm looking for)

Change the paths that distutils will add to the link line. They're at 
the top of setupext.py . Remove the ones you don't need.

> By the way, it would also be good to get this to work with TK and/or 
> GTK. Has anyone done that successfully that would like to help out with 
> this?

With TclTkAqua, it Just Works.

> Also, as far as PyGTK is concerned. Can you run it without running Fink? 
> That's the only way I've seen it done. If it is a Fink only option, then 
> this is moot, as I'm looking for a Fink free approach, and someone else 
> has put together a fink matplotlib package.

You could try Darwinports. Set Darwinports' prefix to /usr/local, and 
use port(1) to make Installer.app packages for GTK et al. Bundle them 
with your bdist_mpkg metapackage.

My strategy for building matplotlib (and I've done it *a lot* in the 
past few weeks) is as follows:

I have Darwinports with a prefix in a GNU Stow repository. What Stow 
does is it allows you to install stuff into it's own directory 
(/usr/local/stow/darwinports, which has bin/, lib/, share/ et al.) and 
then makes symlinks such that everything appears to be installed to 
/usr/local. So I have Darwinports install libpng and libfreetype. I have 
a script that will remove the symlinks to the dylibs for libpng, 
libfreetype, and libz (I could probably resolve this by changing the 
order of search). I build matplotlib and double-check the dylib 
dependencies with "otool -L". I do not bother with GTK at this time.

-- 
Robert Kern
rk...@uc...

"In the fields of hell where the grass grows high
  Are the graves of dreams allowed to die."
   -- Richard Harter

[Matplotlib-users] Re: [Pythonmac-SIG] matplotlib OS-X binary problems.

[Bob I. <bo...@re...>]

On Feb 3, 2005, at 19:07, Chris Barker wrote:

> I posted a note here the other day about a matplotlib binary. I've 
> discovered a problem with it. Apparently, it has linked against the 
> libfreetype in /usr/X11. That means it will work fine on a system with 
> Apple's X11 installed (like mine or the first system I tested it on).

.. and the system that I tested it on :)

> So, the question remains: How to I get distutils to statically link 
> selected libs? Bob had suggested:
>
> """Make sure you don't have libpng.dylib or libfreetype.dylib sitting 
> around on your link paths...
>
> Build them like this:
> ./configure --disable-shared --enable static
>
> Make sure you only have libpng.a and libfreetype.a on your link paths. 
> It will link statically.
> """
>
> However, that doesn't seem to work if I have libfreetype.dylib 
> somewhere standard, and I certainly don't want to remove it! (Maybe I 
> could temporarily, but that's hardly the robust solution I'm looking 
> for)

You have three options:
- make sure the dylibs aren't sitting around in the same location as 
the .a, and make sure the .a's path is preferred (you could make a 
local dir, -L to it, symlink the archives in)
- change the setup.py relatively significantly and specify them as 
object files with their full path (I can't tell you off the top of my 
head what the distutils incantation would be for this, but you 
definitely can not use it's "libraries" option, or whatever that is 
called)
- don't link statically and install the dylibs too, somehow (possibly 
by building+installing them with 
--prefix=/Library/Python/2.3/matplotlib/lib-dynload/ and -L to that 
when linking.. note that this would require a bdist_mpkg subclass to 
make a .pkg out of it)

-bob

[Matplotlib-users] matplotlib OS-X binary problems.

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

Hi all,

I posted a note here the other day about a matplotlib binary. I've 
discovered a problem with it. Apparently, it has linked against the 
libfreetype in /usr/X11. That means it will work fine on a system with 
Apple's X11 installed (like mine or the first system I tested it on).

So, the question remains: How to I get distutils to statically link 
selected libs? Bob had suggested:

"""Make sure you don't have libpng.dylib or libfreetype.dylib sitting 
around on your link paths...

Build them like this:
./configure --disable-shared --enable static

Make sure you only have libpng.a and libfreetype.a on your link paths. 
It will link statically.
"""

However, that doesn't seem to work if I have libfreetype.dylib somewhere 
standard, and I certainly don't want to remove it! (Maybe I could 
temporarily, but that's hardly the robust solution I'm looking for)

By the way, it would also be good to get this to work with TK and/or 
GTK. Has anyone done that successfully that would like to help out with 
this?

Also, as far as PyGTK is concerned. Can you run it without running Fink? 
That's the only way I've seen it done. If it is a Fink only option, then 
this is moot, as I'm looking for a Fink free approach, and someone else 
has put together a fink matplotlib package.

By the way the package, as it stands, can be found at:

http://undefined.org/python/matplotlib-0.71-py2.3-macosx10.3.zip

thanks to Bob Ippolito

-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...

[Matplotlib-users] plot_date problem

[Travis B. <td...@fa...>]

Hi Everyone,

I'm using plot_date to scatter a ton of data retrieved from a database
and have encountered an error with the date ticks.

I more or less copied the format of the example in
http://matplotlib.sourceforge.net/examples/date_demo2.py and my ticks
ended up being months in order but never making it past the year 2001
(they just recycle) though my data begin in 2000 and end in 2004.

I took another look at the plot generated by date_demo2.py and it turns
out that the same is true there.

I'm thinking this is not intentional, but if so does anyone have any
advice or example scripts that might help me fix my plot?

Thank you,

Travis Brady
-- 
  Travis Brady
  td...@fa...

[Matplotlib-users] duplicated colorbar

[<fcc...@fi...>]

hi, I am plotting two figures in a row and I am getting a duplicated colorb=
ar=20
in the second figure:

imshow(stats[0])
title('Distance Matrix')
colorbar()
savefig('dm.png')
imshow(stats[12])
colorbar()
title('Conectivity Matrix')
savefig('cm.png')

I tried omitting the second colorbar() command. Then I get a single colorba=
r=20
in the second figure but with same scale of figure 1.

What am I doing wrong?

=46l=E1vio

Re: [Matplotlib-users] Mac OS X - ImportError: cannot import name POLAR

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

>>>>> "Graeme" == Graeme O'Keefe <gj...@ne...> writes:

    Graeme> Hi, I've installed matplotlib 0.71 on Mac OS X 10.3 which
    Graeme> completed without errors.

    Graeme> when I run python "import matplotlib" is fine, but "import
    Graeme> pylab" bombs with "ImportError: cannot import name POLAR"


rm -rf the build directory *and* site-packages/matplotlib and
rebuild/reinstall.  This cures the problem 95% of the time.  It is
usually caused from some detritus from a previous build or install
that distutils doesn't handle so well.  Let mw know...

JDH

Re: [Matplotlib-users] aspect in imshow

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

>>>>> "Eric" == Eric Emsellem <ems...@ob...> writes:

    Eric> Hi John, sorry to bother you about this again, but is there
    Eric> a fix to the bug in the imshow routine (using the
    Eric> aspect='preserve' option).  If not, let me know if you have
    Eric> an idea when this could be done (no pushing there, just to
    Eric> plan things on my side: I am at the moment using an
    Eric> artificial way to replace that option by calculating
    Eric> coordinates on the plot, just to know if I need to go on
    Eric> with that or not).

Hi Eric, there is not a fix yet, but there is a workaround in CVS.  

I played around with some things that got the initial coords right but
then broke under window resizes and I rolled these changes back.  It
is a somewhat tough problem, to preserve aspect ration under possible
figure and axes resizes, and/or view limit navigation.  It is a very
high priority bug for me, but because it is also a hard one its taking
a little while.  SO I can't give you a firm date -- I'll try and get
something serviceable in the next couple of weeks.

This is the same bug that causes zoom to rect on aspect=preserve plots
to get the wrong limits.

Fernando Perez submitted a patch in CVS that works around the problem
for now using the "matshow" command.  This command takes the same
arguments as imshow and creates a figure and an axes which are scaled
to have the same dimensions as the array.  Thus if you don't resize
your window, you can plot an array with matshow with either free or
preserve and the aspect ratio will be correct.  But, if you zoom to
rect or resize your window, even with matshow you'll lose the aspect
ratio.  I'll include the docstring for matshow below so you can see if
you're interested

I've very aware of the scientists need to "just see the data" w/o any
fancy stuff.  Hopefully a fix will be in soon.

JDH


matshow:

    """Display an array as a matrix.

    The origin is set at the upper left hand corner and rows (first dimension
    of the array) are displayed horizontally.  The aspect ratio of the figure
    window is that of the array, as long as it is possible to fit it within
    the constraints of your figure.figsize_min/max parameters with no
    stretching.  If the window dimensions can't accomodate this (extremely
    tall/wide arrays), some stretching will inevitably occur.

    matshow() calls imshow() with args and **kwargs, but by default
    it sets interpolation='nearest' (unless you override it).  All
    other arguments and keywords are passed to imshow(), so see its
    docstring for further details.

    Tick labels for the xaxis are placed on top by default.
    
    return value is a (fig, ax, im) tuple

    Example usage:
    
    def samplemat(dims):
        aa = zeros(dims)
        for i in range(min(dims)):
            aa[i,i] = i
        return aa

    dimlist = [(12,12),(128,64),(64,512),(2048,256)]

    
    for d in dimlist:
        fig, ax, im = matshow(samplemat(d))
    show()
    
    """

[Matplotlib-users] aspect in imshow

[Eric E. <ems...@ob...>]

Hi John,
sorry to bother you about this again, but is there a fix to the bug
in the imshow routine (using the aspect='preserve' option).
If not, let me know if you have an idea when this could be done
(no pushing there, just to plan things on my side: I am at the moment
using an artificial way to replace that option by calculating coordinates
on the plot, just to know if I need to go on with that or not).

Let me know; Thanks!

Eric

-- 
===============================================================
Observatoire de Lyon                 ems...@ob...
9 av. Charles-Andre                      tel: +33 4 78 86 83 84
69561 Saint-Genis Laval Cedex            fax: +33 4 78 86 83 86
France               http://www-obs.univ-lyon1.fr/eric.emsellem
===============================================================

[Matplotlib-users] Mac OS X - ImportError: cannot import name POLAR

[Graeme O'K. <gj...@ne...>]

Hi,

I've installed matplotlib 0.71 on Mac OS X 10.3 which completed without  
errors.

when I run python
	"import matplotlib"
is fine, but
	"import pylab"
bombs with
	"ImportError: cannot import name POLAR"

see below  for a screendump of the reported errors when I try to import  
pylab.
I did not run this in the build directory.

/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ 
site-packages
(which is linked to /Library/Python/2.3)

/Library/Python/2.3/matplotlib/transforms.py, line 189: from  
_transforms import IDENTITY, LOG10, POLAR, Func, FuncXY
/Library/Python/2.3/matplotlib/_transforms.so exists and is 3503536  
bytes in size.

here is a screendump of the reported errors when I try to import pylab.
I did not run this in the build directory.

can anyone help?

regards,

Graeme

[graeme:~/Desktop/downloads/matplotlib-0.71] gjok% python
Python 2.3 (#1, Sep 13 2003, 00:49:11)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1495)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> import pylab
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/pylab.py", line 1, in ?
     from matplotlib.pylab import *
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/pylab.py", line 190, in ?
     from axes import Axes, PolarAxes
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/axes.py", line 12, in ?
     from artist import Artist
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/artist.py", line 3, in ?
     from transforms import identity_transform
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/matplotlib/transforms.py", line 189, in ?
     from _transforms import IDENTITY, LOG10, POLAR, Func, FuncXY
ImportError: cannot import name POLAR

Re: [Matplotlib-users] Binary Matplotlib package

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

>>>>> "Chris" == Chris Barker <Chr...@no...> writes:

    Chris> Hi all, I think I've successfully build a binary matplotlib
    Chris> package for use with Apple's Python on OS-X 10.3.* In
    Chris> theory the only other thing it requires is Numeric, and I
    Chris> have a package for that too (courtesy of Bob Ippolito).

    Chris> It's almost 5 MB, so I haven't included it here. I also
    Chris> don't have a web site to put it on at the moment, so:

    Chris> A) if you send me a note, I'll send it to you B) if you
    Chris> have a place to host it, please volunteer to do so.

    Chris> I'd like people to test it out, all I know now is that it
    Chris> works on my system.

    Chris> Once it's been better tested, perhaps we can get it put on
    Chris> the sourceforge download page.

High Chris,

Thanks for doing this.  Are either the GTK or Tk GUI backends compiled
in.  If not, wx* will still work on boxes that have wxpython
installed, but it would be a good idea to summarize what is available
in the package.

Thanks!
JDH

[Matplotlib-users] Binary Matplotlib package

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

Hi all,

I think I've successfully build a binary matplotlib package for use with 
Apple's Python on OS-X 10.3.* In theory the only other thing it requires 
is Numeric, and I have a package for that too (courtesy of Bob Ippolito).

It's almost 5 MB, so I haven't included it here. I also don't have a web 
site to put it on at the moment, so:

A) if you send me a note, I'll send it to you
B) if you have a place to host it, please volunteer to do so.

I'd like people to test it out, all I know now is that it works on my 
system.

Once it's been better tested, perhaps we can get it put on the 
sourceforge download page.

thanks,
-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...

[Matplotlib-users] Patches in polar axes ?

[Dominique O. <Dom...@po...>]

Hello,

How complicated would it be to obtain the add_patch() capability in 
polar axes? Right now, the script

--------------------
from pylab import *
import matplotlib.patches as patches

ax = axes( [0.1, 0.1, 0.8, 0.8], polar = True )
ptch = patches.RegularPolygon( (pi/2,.5), 5, orientation = 20 )
ax.add_patch()
show()
--------------------

fails, Python complaining that polar axes don't have an add_patch() method.

Now, I believe if we simply mimic what's in the Axes class and try to use

artists.extend(patches)

in PolarAxes, the coordinates are going to be all wacko.

The following works for me, and I wonder whether it is a useful addition 
to PolarAxes (sorry for the wrapped lines):

--------------------
from matplotlib.pylab import *


def RegularPolygon_polar( ax, xy, numVertices, radius = 5, orientation = 
0, **kwargs ):
     import matplotlib.patches as patches
     import matplotlib.transforms as transforms

     ptch = patches.RegularPolygon( (0,0),
                                    numVertices,
                                    radius = radius,
                                    orientation = orientation,
                                    **kwargs )

     trans = transforms.identity_affine()
     trans.set_offset( xy, ax.transData )
     ptch.set_transform( trans )
     return ptch

ax = axes( [0.1, 0.1, 0.8, 0.8], polar = True )
ptch = RegularPolygon_polar( ax, (150*pi/180,.5), 5, radius = 10, 
orientation = 80 )
ax.add_patch( ptch )
show()
--------------------

If this sounds like the way to go, let me know. I'm willing to write the 
few methods similar to the above and add them to PolarAxes.

On the other hand, it might be easier to simply modify the classes in 
patches.py, but I am not sure how they would access the Axes instance.

Cheers,
Dominique

Re: [Matplotlib-users] Timezone response of date2num and mx2num differs

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

>>>>> "Delbert" == Delbert D Franz <iq...@so...> writes:

    Delbert> I just did another test. mx2num fails for dates prior to
    Delbert> 1970 because it uses the magical Unix seconds from epoch.
    Delbert> We need mx2num to work for the whole range of dates for
    Delbert> which date2num works-at least that is my vote.  Delbert
    Delbert> On Wednesday 02 February 2005 10:10 am, Delbert D. Franz wrote:

If you feel up to making an mx2num that satisfies these requirements,
I'm happy to include it as a patch.

JDH