matplotlib-users Mailing List for matplotlib

I would check to make sure you installed freetype right.. You may 
also consider installing freetype2 from the i-Installer (usually 
used for TeX installs, but has tones of other goodies). I have had 
good luck with this binary installation, where I have had trouble 
(admittedly some time ago) with homemade freetype installs from source.
-Rob.
On Mar 16, 2006, at 2:37 PM, Vidar Gundersen wrote:
> ===== Original message from Charlie Moad | 16 Mar 2006:
>> This looks like the same error you get if you try to link against
>> Apple's bundled freetype in /usr/X11R6/lib. Also, the 
>> "libfreetype.6"
>> makes me think this library is not freetype2.
>
> i've installed freetype2 in /usr/local/ :
>
> buri:~/Desktop vidar$ ls /usr/local/lib/libfreetype.*
> /usr/local/lib/libfreetype.6.3.8.dylib /usr/local/lib/ 
> libfreetype.dylib
> /usr/local/lib/libfreetype.6.dylib /usr/local/lib/libfreetype.la
> /usr/local/lib/libfreetype.a
-----
Rob Hetland, Assistant Professor
Dept of Oceanography, Texas A&M University
p: 979-458-0096, f: 979-845-6331
e: he...@ta..., w: http://pong.tamu.edu

Hello,
I have been using Python as a precision extended Calculator. This works =
great!
I am learning to program Python, it is a powerful langurge,=20
but I am not a power programmer.=20
It would be nice to be able to be a better programmer, I would like =
that!
but I only want to use Python to generate and plot data!=20
I write programs only to help me with my work.
=20
Python is installed on a Widows XP machine at C:\Program Files\Python
Also installed is the Python enthought edition at C:\Python23
I use the Idle shell GUI to write, edit, and run Python programs.=20
I do not run or use Python from the dos command line.
For linear x-axis data, I used a range(42) Python statement
to create successive integers, (0 to 41) for my x array (list) data.
I also have 20 y-axis data arrays (Lists) of 42 elements of floating =
point data,
I want to plot one or more of these sets of y-axis data (log or semilog)
with 60 decades of y-axis display, precision floating point data=20
with values from 1e-30 to 1e+30 range.=20
(This large range results from particle energy, frequency, capacitance, =
etc. data
plotted on the same scale)
I have not been able to do any simple plotting=20
because I can't get matplotlib and Python to work together.
I get lost trying to discover if my problem is a path problem, install =
directory problem,
backend and Idle GUI conflict., etc. I have installed and uninstalled =
several times.
Is there a working executable install available that already has a =
everythin?=20
Compatible GUI, rendering engine, etc and all the neccessary stuff =
already selected?
If not, is there somewhre a list definitely compatible components,=20
and a list of steps to follow, that will definitely result=20
in a working marriage of Python and Matplotlib?
Yes I have been trying to read doccumentation, FAQ, etc.
but I can't quite put it all together.
Thanks for any help.that anyone can give.

Hello,
I need to create a Linear Regression plot where the vertices are plotted on a logarithmic plane
and the regression line is plotted on a linear plane. The two are then combined. Here is what I
have so far:
from pylab import *
prediction_experiment = [(313.11000000000001, 25.797999999999998), (4499.1999999999998, 25000.0),
(168830.0, 440000.0), (143090.0, 78571.399999999994), (34811.0, 78571.399999999994), (161240.0,
70967.699999999997)]
def log10Product(x, pos):
 """The two args are the value and tick position.
 Label ticks with the product of the exponentiation"""
 return '%1i' % (x)
def generateLRPlot():
 
 prediction_experiment.sort()
 
 x, y = map(array, zip(*prediction_experiment))
 
 ax = subplot(111)
 
 ax.set_xscale('log')
 ax.set_yscale('log')
 
 formatter = FuncFormatter(log10Product)
 ax.xaxis.set_major_formatter(formatter)
 ax.yaxis.set_major_formatter(formatter)
 
 # the bestfit line from polyfit
 m, b = polyfit(x, y, 1) # a line is 1st order polynomial...
 plot(x, y, 'b.', x, m*x+b, 'r', linewidth=0.1, markersize=2)
 
 # Must add 1 to allow the last decades label to be shown
 ax.set_xlim(1e-1, max(x)+1)
 ax.set_ylim(1e-1, max(y)+1)
 grid(True) 
 xlabel(r"Prediction", fontsize = 12)
 ylabel(r"Experimental IC50 [nM]", fontsize = 12)
 show()
 # clear the matplotlib figure and axis
 clf()
 cla()
 
generateLRPlot()
Thanks for the help,
Derek Basch
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

===== Original message from Charlie Moad | 16 Mar 2006:
> This looks like the same error you get if you try to link against
> Apple's bundled freetype in /usr/X11R6/lib. Also, the "libfreetype.6"
> makes me think this library is not freetype2.
i've installed freetype2 in /usr/local/ :
buri:~/Desktop vidar$ ls /usr/local/lib/libfreetype.*
/usr/local/lib/libfreetype.6.3.8.dylib /usr/local/lib/libfreetype.dylib
/usr/local/lib/libfreetype.6.dylib /usr/local/lib/libfreetype.la
/usr/local/lib/libfreetype.a

>>>>> "Charlie" == Charlie Moad <cw...@gm...> writes:
 Charlie> Since this is in 2.4, I almost want to say we should
 Charlie> just point python2.3 users to a download url if there is
 Charlie> an error on import. Kinda like IPython does if it can't
 Charlie> import readline.
One problem with this approach and the code as it exists is that agg
and ps both import texmanager. If texmanager import fails w/o
subprocess, that means it's an extra headache for people who don't
need texmanager or it's functionality.
So I suggest either we distribute it or reorganize the imports so that
the only people who get a failure are those actually using
texmanager. Heck, if they can get tex installed and working on win32,
I figure they would jump through just about any hoop :-)
 
Since we already are distributing it, I'm inclined at this point to
fix the bug and continue with this path. 
JDH

Charlie Moad wrote:
> This looks like the same error you get if you try to link against
> Apple's bundled freetype in /usr/X11R6/lib. Also, the "libfreetype.6"
> makes me think this library is not freetype2.
No, that is the correct soname for FreeType2's libfreetype library.
-- 
Robert Kern
rob...@gm...
"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
 -- Umberto Eco

This looks like the same error you get if you try to link against
Apple's bundled freetype in /usr/X11R6/lib. Also, the "libfreetype.6"
makes me think this library is not freetype2. How did you install
freetype?
- Charlie
On 3/16/06, Vidar Gundersen <vid...@37...> wrote:
>
> what's causing this problem?
> i've been compiling all recent matplotlib releases
> on my system, but 0.87.x cause problems:
>
> buri:~/Desktop/matplotlib-0.87.2 vidar$ python
> Python 2.4.2 (#1, Jan 9 2006, 02:03:19)
> [GCC 4.0.1 (Apple Computer, Inc. build 5247)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import pylab
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "/usr/local/lib/python2.4/site-packages/pylab.py", line 1, in ?
> from matplotlib.pylab import *
> File "/usr/local/lib/python2.4/site-packages/matplotlib/pylab.py", line=
 200, in ?
> from axes import Axes, PolarAxes
> File "/usr/local/lib/python2.4/site-packages/matplotlib/axes.py", line =
15, in ?
> from axis import XAxis, YAxis
> File "/usr/local/lib/python2.4/site-packages/matplotlib/axis.py", line =
25, in ?
> from font_manager import FontProperties
> File "/usr/local/lib/python2.4/site-packages/matplotlib/font_manager.py=
", line 39, in ?
> from matplotlib import ft2font
> ImportError: Failure linking new module: /usr/local/lib/python2.4/site-pa=
ckages/matplotlib/ft2font.so: Symbol not found: _FT_Get_PS_Font_Info
> Referenced from: /usr/local/lib/python2.4/site-packages/matplotlib/ft2f=
ont.so
> Expected in: /usr/local/lib/libfreetype.6.dylib
>
>
>
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> _______________________________________________
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> Mat...@li...
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>

 Since this is in 2.4, I almost want to say we should just point
python2.3 users to a download url if there is an error on import.=20
Kinda like IPython does if it can't import readline.
On 3/16/06, Darren Dale <dd...@co...> wrote:
> On Thursday 16 March 2006 14:33, da...@in... wrote:
> > Hi All,
> >
> > I installed the new release for win32 and python 2.3 but
> > every time that I import the pylab, I receive the
> > following error:
> [...]
> > "C:\Python23\Lib\site-packages\matplotlib\texmanager.py",
> > line 37, in ?
> > from subprocess import Popen, STDOUT, PIPE
> > File
> > "C:\Python23\Lib\site-packages\subprocess\__init__.py",
> > line 366, in ?
> > from _subprocess import *
> > ImportError: No module named _subprocess
>
> Do you have pywin32 installed on your computer? If so, you can change lin=
e 353
> of subprocess/__init__.py to read "if 1:".
>
> I'll work on a proper fix. In my defense, I posted to this list on March =
8
> asking for windows users with python-2.3 to test the subprocess module, a=
long
> with a link to the file on my webpage.
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by xPML, a groundbreaking scripting langua=
ge
> that extends applications into web and mobile media. Attend the live webc=
ast
> and join the prime developer group breaking into this new coding territor=
y!
> http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D110944&bid=3D241720&dat=
=3D121642
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

what's causing this problem?
i've been compiling all recent matplotlib releases
on my system, but 0.87.x cause problems:
buri:~/Desktop/matplotlib-0.87.2 vidar$ python
Python 2.4.2 (#1, Jan 9 2006, 02:03:19) 
[GCC 4.0.1 (Apple Computer, Inc. build 5247)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import pylab
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
 File "/usr/local/lib/python2.4/site-packages/pylab.py", line 1, in ?
 from matplotlib.pylab import *
 File "/usr/local/lib/python2.4/site-packages/matplotlib/pylab.py", line 200, in ?
 from axes import Axes, PolarAxes
 File "/usr/local/lib/python2.4/site-packages/matplotlib/axes.py", line 15, in ?
 from axis import XAxis, YAxis
 File "/usr/local/lib/python2.4/site-packages/matplotlib/axis.py", line 25, in ?
 from font_manager import FontProperties
 File "/usr/local/lib/python2.4/site-packages/matplotlib/font_manager.py", line 39, in ?
 from matplotlib import ft2font
ImportError: Failure linking new module: /usr/local/lib/python2.4/site-packages/matplotlib/ft2font.so: Symbol not found: _FT_Get_PS_Font_Info
 Referenced from: /usr/local/lib/python2.4/site-packages/matplotlib/ft2font.so
 Expected in: /usr/local/lib/libfreetype.6.dylib

On Thursday 16 March 2006 14:33, da...@in... wrote:
> Hi All,
>
> I installed the new release for win32 and python 2.3 but
> every time that I import the pylab, I receive the
> following error:
[...]
> "C:\Python23\Lib\site-packages\matplotlib\texmanager.py",
> line 37, in ?
> from subprocess import Popen, STDOUT, PIPE
> File
> "C:\Python23\Lib\site-packages\subprocess\__init__.py",
> line 366, in ?
> from _subprocess import *
> ImportError: No module named _subprocess
Do you have pywin32 installed on your computer? If so, you can change line 353 
of subprocess/__init__.py to read "if 1:".
I'll work on a proper fix. In my defense, I posted to this list on March 8 
asking for windows users with python-2.3 to test the subprocess module, along 
with a link to the file on my webpage.

This is sneaking in for python2.3 and windows. Here is the code
culprit below. We'll have to look into where this _subprocess module
is supposed to be coming from.
For now you can download
"http://effbot.org/downloads/subprocess-0.1-20041012.win32-py2.3.exe"
from "http://effbot.org/downloads/". I'll post a new python2.3 build
shortly that includes this.
if mswindows:
 import threading
 import msvcrt
 if 0: # <-- change this to use pywin32 instead of the _subprocess drive=
r
 import pywintypes
 from win32api import GetStdHandle, STD_INPUT_HANDLE, \
 STD_OUTPUT_HANDLE, STD_ERROR_HANDLE
 from win32api import GetCurrentProcess, DuplicateHandle, \
 GetModuleFileName, GetVersion
 from win32con import DUPLICATE_SAME_ACCESS, SW_HIDE
 from win32pipe import CreatePipe
 from win32process import CreateProcess, STARTUPINFO, \
 GetExitCodeProcess, STARTF_USESTDHANDLES, =
\
 STARTF_USESHOWWINDOW, CREATE_NEW_CONSOLE
 from win32event import WaitForSingleObject, INFINITE, WAIT_OBJECT_0
 else:
 from _subprocess import *
 class STARTUPINFO:
 dwFlags =3D 0
 hStdInput =3D None
 hStdOutput =3D None
 hStdError =3D None
 class pywintypes:
 error =3D IOError
else:
 import select
 import errno
 import fcntl
 import pickle
On 3/16/06, da...@in... <da...@in...> wrote:
> Hi All,
>
> I installed the new release for win32 and python 2.3 but
> every time that I import the pylab, I receive the
> following error:
>
> Microsoft Windows XP [Version 5.1.2600]
> (C) Copyright 1985-2001 Microsoft Corp.
>
> C:\Python23>python FIRExample --verbose-helpful
> matplotlib data path
> C:\Python23\lib\site-packages\matplotlib\mpl-data
> $HOME=3DC:\Documents and Settings\a
> CONFIGDIR=3DC:\Documents and Settings\a\.matplotlib
> loaded rc file
> C:\Python23\lib\site-packages\matplotlib\mpl-data\matplotlibrc
> matplotlib version 0.87.2
> verbose.level helpful
> interactive is False
> platform is win32
> numerix Numeric 23.6
> font search path
> ['C:\\Python23\\lib\\site-packages\\matplotlib\\mpl-data']
> loaded ttfcache file C:\Documents and
> Settings\a\.matplotlib\ttffont.
> cache
> Traceback (most recent call last):
> File "FIRExample", line 2, in ?
> import pylab
> File "C:\Python23\Lib\site-packages\pylab.py", line 1,
> in ?
> from matplotlib.pylab import *
> File
> "C:\Python23\Lib\site-packages\matplotlib\pylab.py", line
> 219, in ?
> new_figure_manager, draw_if_interactive, show =3D
> pylab_setup()
> File
> "C:\Python23\Lib\site-packages\matplotlib\backends\__init__.py",
> line 23,
> in pylab_setup
> globals(),locals(),[backend_name])
> File
> "C:\Python23\Lib\site-packages\matplotlib\backends\backend_tkagg.py",
> lin
> e 9, in ?
> from backend_agg import FigureCanvasAgg
> File
> "C:\Python23\Lib\site-packages\matplotlib\backends\backend_agg.py",
> line
> 86, in ?
> from matplotlib.texmanager import TexManager
> File
> "C:\Python23\Lib\site-packages\matplotlib\texmanager.py",
> line 37, in ?
> from subprocess import Popen, STDOUT, PIPE
> File
> "C:\Python23\Lib\site-packages\subprocess\__init__.py",
> line 366, in ?
> from _subprocess import *
> ImportError: No module named _subprocess
>
>
> Also the User's Guide doesn't work. The pdf file seems to
> be damaged.
> Can you help me?
>
> Thanks in advance
>
> Daigos
>
>
> INFINITO ADSLFLAT 4 MEGA: SOLO 27,90 EURO AL MESE IVA INCLUSA IP STATICO,=
 BANDA GARANTITA 256Kbps ANTIVIRUS E FIREWALL INCLUSI NEL PREZZO
>
> http://adsl.infinito.it
>
>
>
>
>
> -------------------------------------------------------
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> that extends applications into web and mobile media. Attend the live webc=
ast
> and join the prime developer group breaking into this new coding territor=
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> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

Hi All,
I installed the new release for win32 and python 2.3 but 
every time that I import the pylab, I receive the 
following error:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Python23>python FIRExample --verbose-helpful
matplotlib data path 
C:\Python23\lib\site-packages\matplotlib\mpl-data
$HOME=C:\Documents and Settings\a
CONFIGDIR=C:\Documents and Settings\a\.matplotlib
loaded rc file 
C:\Python23\lib\site-packages\matplotlib\mpl-data\matplotlibrc
matplotlib version 0.87.2
verbose.level helpful
interactive is False
platform is win32
numerix Numeric 23.6
font search path 
['C:\\Python23\\lib\\site-packages\\matplotlib\\mpl-data']
loaded ttfcache file C:\Documents and 
Settings\a\.matplotlib\ttffont.
cache
Traceback (most recent call last):
 File "FIRExample", line 2, in ?
 import pylab
 File "C:\Python23\Lib\site-packages\pylab.py", line 1, 
in ?
 from matplotlib.pylab import *
 File 
"C:\Python23\Lib\site-packages\matplotlib\pylab.py", line 
219, in ?
 new_figure_manager, draw_if_interactive, show = 
pylab_setup()
 File 
"C:\Python23\Lib\site-packages\matplotlib\backends\__init__.py", 
line 23,
 in pylab_setup
 globals(),locals(),[backend_name])
 File 
"C:\Python23\Lib\site-packages\matplotlib\backends\backend_tkagg.py", 
lin
e 9, in ?
 from backend_agg import FigureCanvasAgg
 File 
"C:\Python23\Lib\site-packages\matplotlib\backends\backend_agg.py", 
line
86, in ?
 from matplotlib.texmanager import TexManager
 File 
"C:\Python23\Lib\site-packages\matplotlib\texmanager.py", 
line 37, in ?
 from subprocess import Popen, STDOUT, PIPE
 File 
"C:\Python23\Lib\site-packages\subprocess\__init__.py", 
line 366, in ?
 from _subprocess import *
ImportError: No module named _subprocess
Also the User's Guide doesn't work. The pdf file seems to 
be damaged.
Can you help me?
Thanks in advance
Daigos
INFINITO ADSLFLAT 4 MEGA: SOLO 27,90 EURO AL MESE IVA INCLUSA IP STATICO, BANDA GARANTITA 256Kbps ANTIVIRUS E FIREWALL INCLUSI NEL PREZZO
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John Hunter wrote:
> Since the various numpy releases are
>not binary compatible, if you are using matplotlib-0.87.2 with numpy
>on win32, you will need numpy-0.9.6. 
>
Just for clarification, the various Numeric and numarray releases are
not binary compatible, either. But numpy checks version numbers and
fails loudly if they don't match, while Numeric and numarray continue
silently trying to run, resulting in segfaults or undefined behavior
later on.

I always compile the binaries against all 3 of the latest array libs.=20
For 0.87.2 I used:
numarray-1.5.1
Numeric-24.2
numpy-0.9.6
Numpy has been the moving target as of late, so that is why I
mentioned it specifically.
On 3/16/06, John Hunter <jdh...@ac...> wrote:
> >>>>> "Mark" =3D=3D Mark Bakker <ma...@gm...> writes:
>
> Mark> John, Charlie - Just for us mere mortals, could you fill us
> Mark> in here. The email states 'compiled against numpy-0.9.6',
> Mark> but it still runs with Numeric, correct?
>
> Correct. I assume Charlie meant that the win32 binaries he compiled
> were compiled with numpy-0.9.6. Since the various numpy releases are
> not binary compatible, if you are using matplotlib-0.87.2 with numpy
> on win32, you will need numpy-0.9.6. But I believe the win32 binaries
> also have Numeric and numarray support compiled in.
>
> Mark> Are there plans for fully moving to numpy and leaving
> Mark> Numeric behind?
>
> We have talked about this but there are no concrete plans at this
> point. We would like to see widespread adoption of numpy first. I
> think this is feasible in a 6 month time frame, as most of the
> lingering issues (eg, nd_image) are rapidly falling into place.
>
> JDH
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by xPML, a groundbreaking scripting langua=
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> that extends applications into web and mobile media. Attend the live webc=
ast
> and join the prime developer group breaking into this new coding territor=
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=3D121642
> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

Is there any reason for having mpl3d as a separate package ?
I mean it would be nice if mpl3d becomes a part of pylab.
Nils

>>>>> "Mark" == Mark Bakker <ma...@gm...> writes:
 Mark> John, Charlie - Just for us mere mortals, could you fill us
 Mark> in here. The email states 'compiled against numpy-0.9.6',
 Mark> but it still runs with Numeric, correct? 
Correct. I assume Charlie meant that the win32 binaries he compiled
were compiled with numpy-0.9.6. Since the various numpy releases are
not binary compatible, if you are using matplotlib-0.87.2 with numpy
on win32, you will need numpy-0.9.6. But I believe the win32 binaries
also have Numeric and numarray support compiled in. 
 Mark> Are there plans for fully moving to numpy and leaving
 Mark> Numeric behind?
We have talked about this but there are no concrete plans at this
point. We would like to see widespread adoption of numpy first. I
think this is feasible in a 6 month time frame, as most of the
lingering issues (eg, nd_image) are rapidly falling into place.
JDH

Would it be possible to change the default reply-to address associated
with the mpl list? I prefer the settings of the scipy list where the
default is to reply to the list. With mpl, I have to add the list
manually.
---------- Forwarded message ----------
From: Ryan Krauss <rya...@gm...>
Date: Mar 16, 2006 11:11 AM
Subject: Re: [Matplotlib-users] TkAgg vs. GTKAgg ioff cla behavior
To: John Hunter <jdh...@ac...>
So, I have some complicated script that doesn't seem to update my
graphs properly with the GTKAgg backend and does update them with the
TkAgg backend (using ipython), but I can't seem to recreate the
behavior with a simple script. If I can come up with a good, simple
example I will re-post. Otherwise I guess we need to assume that I am
doing something wrong somewhere in my complicated script.
Ryan
On 3/15/06, John Hunter <jdh...@ac...> wrote:
> >>>>> "Ryan" =3D=3D Ryan Krauss <rya...@gm...> writes:
>
> Ryan> the GTKAgg backend does not show the plot of y2.
>
> On my system I get the plot of y2 (cos, not sin) -- here is the
> complete script I am using and the --verbose-helpful output below
>
> Example script:
>
> from pylab import *
> t=3Darange(0,1,0.01)
> y=3Dsin(2*pi*t)
> y2=3Dcos(2*pi*t)
> figure(1)
> plot(t,y)
> ioff()
> cla()
> plot(t,y2)
> show()
>
> verbose helpful output:
>
> matplotlib data path /usr/lib/python2.4/site-packages/matplotlib/mpl-da=
ta
> $HOME=3D/home/jdhunter
> CONFIGDIR=3D/home/jdhunter/.matplotlib
> loaded rc file /home/jdhunter/.matplotlib/matplotlibrc
> matplotlib version 0.87.2svn
> verbose.level helpful
> interactive is False
> platform is linux2
> numerix numpy 0.9.7.2247
> font search path ['/usr/lib/python2.4/site-packages/matplotlib/mpl-data=
']
> loaded ttfcache file /home/jdhunter/.matplotlib/ttffont.cache
> backend GTKAgg version 2.6.1
>
> Ryan> Is this a bug, something wrong on my system, or does it make
> Ryan> sense that the GTKAgg backend ignores everything after
> Ryan> ioff()?
>
> All ion and ioff do is control when the drawing takes place. If "ion"
> (interactive is True) then the figure should be redrawn with every
> pylab command. If "ioff" (interactive is off) the figure is only
> drawn with a call to savefig, draw or show. That's how it is supposed
> to work -- the details are spelled out at
> http://matplotlib.sf.net/interactive.html
>
> Let us know if you see further strangeness, and be sure to report the
> output of verbose-helpful
>
> JDH
>

John, Charlie -
Just for us mere mortals, could you fill us in here.
The email states 'compiled against numpy-0.9.6', but it still runs with
Numeric, correct?
Are there plans for fully moving to numpy and leaving Numeric behind?
Thanks again,
Mark

He really meant matplotlib-0.87.2, I think :-)
JDH

>>>>> "Nils" == Nils Wagner <nw...@me...> writes:
 Nils> Hi all, I have discretized the surface of a cube with a
 Nils> number of nodes. The coordinates of these nodes are stored
 Nils> in a two dimensional array x. shape(x) (3, 96)
 Nils> Each column refers to a node while the rows contain the
 Nils> x,y,z coordinates. Is it possible to visualize such a
 Nils> three-dimensional grid with matplotlib ?
Hey Nils,
You could plot these as a 3D scatter plot using mplot3 which is a
matplotlib 3D extensions module
 http://www.scipy.org/Cookbook/Matplotlib/mplot3D
but you may be better off with a dedicated 3D lib such as VTK/Mayavi2
depending on your requirements.
JDH

Compiled against numpy-0.9.6
http://sourceforge.net/project/showfiles.php?group_id=3D80706
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
2006年03月16日 Released 0.87.2
2006年03月15日 Fixed bug in MaxNLocator revealed by da...@in....
 The main change is that Locator.nonsingular now adjusts
 vmin and vmax if they are nearly the same, not just if
 they are equal. A new kwarg, "tiny", sets the threshold. -
 EF
2006年03月14日 Added import of compatibility library for newer numpy
 linear_algebra - TEO
2006年03月12日 Extended "load" function to support individual columns and
 moved "load" and "save" into matplotlib.mlab so they can be
 used outside of pylab -- see examples/load_converter.py -
 JDH
2006年03月12日 Added AutoDateFormatter and AutoDateLocator submitted
 by James Evans. Try the load_converter.py example for a
 demo. - ADS
2006年03月11日 Added subprocess module from python-2.4 - DSD
2006年03月11日 Fixed landscape orientation support with the usetex
 option. The backend_ps print_figure method was
 getting complicated, I added a _print_figure_tex
 method to maintain some degree of sanity - DSD
2006年03月11日 Added "papertype" savefig kwarg for setting
 postscript papersizes. papertype and ps.papersize
 rc setting can also be set to "auto" to autoscale
 pagesizes - DSD
2006年03月09日 Apply P-J's patch to make pstoeps work on windows
 patch report # 1445612 - DSD
2006年03月09日 Make backend rc parameter case-insensitive - DSD
2006年03月07日 Fixed bug in backend_ps related to C0-C6 papersizes,
 which were causing problems with postscript viewers.
 Supported page sizes include letter, legal, ledger,
 A0-A10, and B0-B10 - DSD

Hi all,
I have discretized the surface of a cube with a number of nodes.
The coordinates of these nodes are stored in a two dimensional array x.
shape(x)
(3, 96)
Each column refers to a node while the rows contain the x,y,z coordinates.
Is it possible to visualize such a three-dimensional grid with matplotlib ?
Nils
 

John,
I think this one is fixed now in SVN. Additional torture testing is 
welcome.
Eric
John Hunter wrote:
>>>>>>"Daigos" == <da...@in...> writes:
> 
> 
> Daigos> Hi all, I am a new user of this library and scipy but I
> Daigos> see something strange when I run the following script:
> 
> This looks like a bug in the AutoLocator, possibly in resulting from
> the new MaxNLocator introduced recently. Thanks for the report.
> 
> Eric: below is a script which exposes the bug more clearly (with gplt
> commented out -- I don't have it on my system). If you uncomment the
> ylim command, you will see the correct plot. It looks like the auto
> locator is choosing a ylim range that does not encompass the data. If
> I had to guess, this bug is caused by floating point approximation
> error -- all the ydata in this example are very close to 1.0 and the
> recent MaxNLocator changes made some changes to how we handled
> floating point approximations.
> 
> Charlie: let's hold on 0.87.2 until we get this sorted out.
> 
> JDH
> 
> from scipy import *
> import pylab
> 
> b = [0.0,1.0,0.0]
> a = 1
> w,h = signal.freqz(b,a)
> Magnitude = []
> phase = []
> for i in h:
> magnitude.append(sqrt(i.real**2. +i.imag**2.))
> phase.append(arctan(i.imag/i.real))
> 
> print len(w)
> print len(h)
> print len(magnitude)
> print len(phase)
> 
> i = range(len(magnitude))
> #gplt.plot(i,magnitude)
> print magnitude
> pylab.plot(i,magnitude, 'o')
> #pylab.ylim(0,2) # uncomment this to see correct plot
> pylab.show()

John,
John Hunter wrote:
>>>>>>"Daigos" == <da...@in...> writes:
> 
> 
> Daigos> Hi all, I am a new user of this library and scipy but I
> Daigos> see something strange when I run the following script:
> 
> This looks like a bug in the AutoLocator, possibly in resulting from
> the new MaxNLocator introduced recently. Thanks for the report.
> 
> Eric: below is a script which exposes the bug more clearly (with gplt
> commented out -- I don't have it on my system). If you uncomment the
> ylim command, you will see the correct plot. It looks like the auto
> locator is choosing a ylim range that does not encompass the data. If
> I had to guess, this bug is caused by floating point approximation
> error -- all the ydata in this example are very close to 1.0 and the
> recent MaxNLocator changes made some changes to how we handled
> floating point approximations.
OK, I will look into it. I agree with your guess.
Eric

>>>>> "Ryan" == Ryan Krauss <rya...@gm...> writes:
 Ryan> the GTKAgg backend does not show the plot of y2.
On my system I get the plot of y2 (cos, not sin) -- here is the
complete script I am using and the --verbose-helpful output below
Example script:
 from pylab import *
 t=arange(0,1,0.01)
 y=sin(2*pi*t)
 y2=cos(2*pi*t)
 figure(1)
 plot(t,y)
 ioff()
 cla()
 plot(t,y2)
 show()
verbose helpful output:
 matplotlib data path /usr/lib/python2.4/site-packages/matplotlib/mpl-data
 $HOME=/home/jdhunter
 CONFIGDIR=/home/jdhunter/.matplotlib
 loaded rc file /home/jdhunter/.matplotlib/matplotlibrc
 matplotlib version 0.87.2svn
 verbose.level helpful
 interactive is False
 platform is linux2
 numerix numpy 0.9.7.2247
 font search path ['/usr/lib/python2.4/site-packages/matplotlib/mpl-data']
 loaded ttfcache file /home/jdhunter/.matplotlib/ttffont.cache
 backend GTKAgg version 2.6.1
 Ryan> Is this a bug, something wrong on my system, or does it make
 Ryan> sense that the GTKAgg backend ignores everything after
 Ryan> ioff()?
All ion and ioff do is control when the drawing takes place. If "ion"
(interactive is True) then the figure should be redrawn with every
pylab command. If "ioff" (interactive is off) the figure is only
drawn with a call to savefig, draw or show. That's how it is supposed
to work -- the details are spelled out at
http://matplotlib.sf.net/interactive.html
Let us know if you see further strangeness, and be sure to report the
output of verbose-helpful 
JDH