matplotlib-users Mailing List for matplotlib

I added the .matplotlibrc file and that definitely helps. Thanks.

Regarding the symbols, I changed your file to the match mine and I get
symbols. Here's the change I made:

import pylab
import datetime
d1 = datetime.date( 1995, 1, 1 )
d2 = datetime.date( 2004, 1, 1 )
delta = datetime.timedelta(days=365)

dates = pylab.drange(d1,d2,delta)

y = pylab.rand(len(dates))
pylab.plot_date(dates, y, color ='r',
                               linestyle ='--',
                               linewidth = 1)
pylab.show()


what is the difference here? Thank you very much for your help.

-----Original Message-----
From: John Hunter [mailto:jdh...@ni...] 
Sent: Wednesday, July 06, 2005 3:03 PM
To: Jeff Peery
Cc: mat...@li...
Subject: Re: [Matplotlib-users] plot date

>>>>> "Jeff" == Jeff Peery <jef...@se...> writes:

    Jeff> I'm using 'axes.clear()' to clear the canvas and then I call
    Jeff> plot_date.  Is there a better way to clear the plots?
    Jeff> Thanks.

That is an alias for ax.cla, should work fine.

    Jeff> Also, I tried running your script and I get this error:

    Jeff> "Warning (from warnings module):
    Jeff>   File "C:\Python24\lib\site-packages\matplotlib\__init__.py",
line 604
    Jeff>     warnings.warn('Could not find .matplotlibrc; using
defaults')
    Jeff> UserWarning: Could not find .matplotlibrc; using defaults


For some reason matplotlib is not finding its config file and is
falling back on the gtk backend, which is failing on your system.
Grab a copy of the rc file at http://matplotlib.sf.net/.matplotlibrc
and drop it in C:\Python24\share\matplotlib, and edit the backend
setting to a backend appropriate for your system, eg TkAgg or WXAgg.

JDH

>>>>> "Jeff" == Jeff Peery <jef...@se...> writes:

    Jeff> I'm using 'axes.clear()' to clear the canvas and then I call
    Jeff> plot_date.  Is there a better way to clear the plots?
    Jeff> Thanks.

That is an alias for ax.cla, should work fine.

    Jeff> Also, I tried running your script and I get this error:

    Jeff> "Warning (from warnings module):
    Jeff>   File "C:\Python24\lib\site-packages\matplotlib\__init__.py", line 604
    Jeff>     warnings.warn('Could not find .matplotlibrc; using defaults')
    Jeff> UserWarning: Could not find .matplotlibrc; using defaults


For some reason matplotlib is not finding its config file and is
falling back on the gtk backend, which is failing on your system.
Grab a copy of the rc file at http://matplotlib.sf.net/.matplotlibrc
and drop it in C:\Python24\share\matplotlib, and edit the backend
setting to a backend appropriate for your system, eg TkAgg or WXAgg.

JDH

Also, I tried running your script and I get this error:

"Warning (from warnings module):
  File "C:\Python24\lib\site-packages\matplotlib\__init__.py", line 604
    warnings.warn('Could not find .matplotlibrc; using defaults')
UserWarning: Could not find .matplotlibrc; using defaults

Warning (from warnings module):
  File "C:\Python24\lib\site-packages\matplotlib\__init__.py", line 625
    warnings.warn(message)
UserWarning: could not find rc file; returning defaults
No module named pygtk

Traceback (most recent call last):
  File "C:/Documents and Settings/jeffp/Desktop/test.py", line 1, in
-toplevel-
    import pylab
  File "C:\Python24\lib\site-packages\pylab.py", line 1, in -toplevel-
    from matplotlib.pylab import *
  File "C:\Python24\lib\site-packages\matplotlib\pylab.py", line 196, in
-toplevel-
    import backends
  File "C:\Python24\lib\site-packages\matplotlib\backends\__init__.py",
line 19, in -toplevel-
    globals(),locals(),[backend_name])
  File
"C:\Python24\lib\site-packages\matplotlib\backends\backend_gtk.py", line
20, in -toplevel-
    from backend_gdk import RendererGDK
  File
"C:\Python24\lib\site-packages\matplotlib\backends\backend_gdk.py", line
28, in -toplevel-
    raise SystemExit('PyGTK version %d.%d.%d or greater is required to
run the GTK Matplotlib backends'
SystemExit: PyGTK version 1.99.16 or greater is required to run the GTK
Matplotlib backends"



Any idea what this means? Thanks.

Jeff

-----Original Message-----
From: John Hunter [mailto:jdh...@ni...] 
Sent: Wednesday, July 06, 2005 11:56 AM
To: Jeff Peery
Cc: mat...@li...
Subject: Re: [Matplotlib-users] plot date

>>>>> "Jeff" == Jeff Peery <jef...@se...> writes:

    Jeff> Hello, I'm using plot_date for some simple data. This
    Jeff> function seems to always use a symbol (marker).  If I set
    Jeff> the line pattern to 'r-' I get a solid red line but also
    Jeff> blue markers.  How can I use plot_date without symbols
    Jeff> showing up? Thanks.

Perhaps you are seeing a problem where your previous plot is not
cleared and so you see both on the same axes?  The format strings
works for me as expected

    import pylab
    import datetime
    d1 = datetime.date( 1995, 1, 1 )
    d2 = datetime.date( 2004, 1, 1 )
    delta = datetime.timedelta(days=365)

    dates = pylab.drange(d1,d2,delta)

    y = pylab.rand(len(dates))
    pylab.plot_date(dates, y, 'r-')
    pylab.show()

JDH

I'm using 'axes.clear()' to clear the canvas and then I call plot_date.
Is there a better way to clear the plots? Thanks.

Jeff

-----Original Message-----
From: John Hunter [mailto:jdh...@ni...] 
Sent: Wednesday, July 06, 2005 11:56 AM
To: Jeff Peery
Cc: mat...@li...
Subject: Re: [Matplotlib-users] plot date

>>>>> "Jeff" == Jeff Peery <jef...@se...> writes:

    Jeff> Hello, I'm using plot_date for some simple data. This
    Jeff> function seems to always use a symbol (marker).  If I set
    Jeff> the line pattern to 'r-' I get a solid red line but also
    Jeff> blue markers.  How can I use plot_date without symbols
    Jeff> showing up? Thanks.

Perhaps you are seeing a problem where your previous plot is not
cleared and so you see both on the same axes?  The format strings
works for me as expected

    import pylab
    import datetime
    d1 = datetime.date( 1995, 1, 1 )
    d2 = datetime.date( 2004, 1, 1 )
    delta = datetime.timedelta(days=365)

    dates = pylab.drange(d1,d2,delta)

    y = pylab.rand(len(dates))
    pylab.plot_date(dates, y, 'r-')
    pylab.show()

JDH

>>>>> "Jeff" == Jeff Peery <jef...@se...> writes:

    Jeff> Hello, I'm using plot_date for some simple data. This
    Jeff> function seems to always use a symbol (marker).  If I set
    Jeff> the line pattern to 'r-' I get a solid red line but also
    Jeff> blue markers.  How can I use plot_date without symbols
    Jeff> showing up? Thanks.

Perhaps you are seeing a problem where your previous plot is not
cleared and so you see both on the same axes?  The format strings
works for me as expected

    import pylab
    import datetime
    d1 = datetime.date( 1995, 1, 1 )
    d2 = datetime.date( 2004, 1, 1 )
    delta = datetime.timedelta(days=365)

    dates = pylab.drange(d1,d2,delta)

    y = pylab.rand(len(dates))
    pylab.plot_date(dates, y, 'r-')
    pylab.show()

JDH

Hello, I'm using  plot_date for some simple data. This function seems to
always use a symbol (marker).  If I set the line pattern to 'r-' I get a
solid red line but also blue markers.  How can I use plot_date without
symbols showing up? Thanks.

Jeff

>>>>> "Mark" == Mark Bakker <ma...@gm...> writes:

    Mark> John - The current option for 'axis('equal') only sets the
    Mark> coordinate range the same on each axis, correct?  What I
    Mark> want is to have the lengths of the axes scaled according to
    Mark> the min/max values along the x and y axes.  That is
    Mark> important when you contour spatial data, for example.
    Mark> That's the button I made.

axis('equal') should work like matlab's option.  Your post suggests
that your version does and I infer therefore that the current
axis('equal') does not.  I'm wondering if we should substitute your
version in there.  Even if not, we can do both, with a suitably named
flag.  Would you be willing to incorporate your suggestion into the
axis function and submit it as a patch to the sf site?

    Mark> I understand the hassle of adding a button that works on all
    Mark> back-ends.  I'll try to post my button for the TK back-end
    Mark> and we'll take it from there.

Sounds good.

JDH

John -

The current option for 'axis('equal') only sets the coordinate range the=20
same on each axis, correct?
What I want is to have the lengths of the axes scaled according to the=20
min/max values along the x and y axes.
That is important when you contour spatial data, for example.=20
That's the button I made.

I understand the hassle of adding a button that works on all back-ends.
I'll try to post my button for the TK back-end and we'll take it from there=
.

Mark


On 7/6/05, John Hunter <jdh...@ac...> wrote:
>=20
> >>>>> "Mark" =3D=3D Mark Bakker <ma...@gm...> writes:
>=20
> Mark> Hello - I wrote a small function that scales the axes so
> Mark> that the true scale (e.g. the coordinates per inch) are the
> Mark> same along each axis. This is useful when you contour
> Mark> spatial data where the x and y axes are in meters, for
> Mark> example. It is equivalent to the 'axis equal' command in
> Mark> matlab. Except that once given that command in matlab it is
> Mark> persistent. Here you have to push the button every time you
> Mark> changed the figure window or zoom.
>=20
> Hey Mark,
>=20
> Did you know there is already an "equal" option to the axis command.
> If it doesn't work right, could you fix it and send me a patch?
>=20
> Mark> I added the function to the toolbar2 class and added a
> Mark> button to the toolbar. For the Tk backend this works great.
> Mark> And I don't think it is back-end dependent, but then again,
> Mark> what do I know.
>=20
> Mark> Any chance that such a button on the toolbar can be added to
> Mark> the official release? Or are there better ways to do this?
>=20
> This kind of button is useful to many but not others, and is a perfect
> candidate for a modular toolbar. We've talked in the past about
> supporting customized toolbars, with a contrib module for user defined
> tool functions. But this has stalled in part because modifying the
> toolbar across many GUIs is a pain. One solution would be to use
> matplotlib buttons in a GUI neutral toolbar -- then customizing it
> would be trivial and would work for free across backends.
>=20
> Perhaps you should post a patch or code so others could test your
> button and see if they like it enough to put it on the standard
> toolbar until we get support for custom, extensible toolbars.
>=20
> JDH
>

>>>>> "Brice" == Brice Thurin <B.P...@ci...> writes:
    Brice> packages/matplotlib/font_manager.py", line 458, in
    Brice> createFontDict prop = ttfFontProperty(font) File
    Brice> "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-
    Brice> packages/matplotlib/font_manager.py", line 271, in
    Brice> ttfFontProperty sfnt = font.get_sfnt() RuntimeError: No
    Brice> SFNT name table


Try editing matplotlib/font_manager.py on line 458 and replacing


            prop = ttfFontProperty(font)

with 

            try: prop = ttfFontProperty(font)
            except: continue

Let me know if this helps...

JDH

>>>>> "Yannick" == Yannick Copin <yc...@ip...> writes:

    Yannick> Hi, I have a strange error while importing pylab in
    Yannick> parallel to my own library. In the test script below, my
    Yannick> function open_spec (which has strictly nothing to do w/
    Yannick> pylab: it's a swig wrapper to a C-library of mine)
    Yannick> doesn't act the same if I import pylab first or not:

I assume if you comment out the pylab import the two print statements
are the same?

What version of matplotlib are you using?

If you are dereferencing a memory location you don't own in your
extension code, then anything that changes the memory layout could
lead to the effect you are seeing.  What if you replace the 'import
pylab' with other imports, like 'import scipy' or 'import Tkinter'.
Do you see any effect?

matplotlib also includes some SWIG wrapped classes, these are imported
in matplotlib.lines which pylab imports.  One way to test if this
might be the source of your troubles (different SWIG runtime
versions?) is to replace the 'import pylab' line with each of the
following in turn

  import matplotlib.agg

OR 

  import matplotlib.lines

OR 

  import matplotlib.patches


The first two import the SWIG code, the third does not.  If the first
two cause the problem and the third does not, it looks like a SWIG
conflict.


JDH

Hello,

I still have the same error, same with the binary package:

Traceback (most recent call last):
   File "<stdin>", line 1, in ?
   File  
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/pylab.py", line 1, in ?
     from matplotlib.pylab import *
   File  
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/pylab.py", line 198, in ?
     from axes import Axes, PolarAxes
   File  
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/axes.py", line 14, in ?
     from axis import XAxis, YAxis
   File  
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/axis.py", line 21, in ?
     from font_manager import FontProperties
   File  
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/font_manager.py", line 982, in ?
     fontManager = FontManager()
   File  
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/font_manager.py", line 826, in __init__
     rebuild()
   File  
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/font_manager.py", line 819, in rebuild
     self.ttfdict = createFontDict(self.ttffiles)
   File  
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/font_manager.py", line 458, in createFontDict
     prop = ttfFontProperty(font)
   File  
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/font_manager.py", line 271, in ttfFontProperty
     sfnt = font.get_sfnt()
RuntimeError: No SFNT name table

Many Thanks for your help

Brice



On 15 Jun 2005, at 18:58, Chris Barker wrote:

>
> Michael Twomey wrote:
>> I'd recommend trying Chris's binary package when he gets it done
>> (Chris, do you need any help on that front?).
>
> Well, not for what I intend to do, but I wasn't planning on building  
> in PyGTK support. In a way, doing that is contrary to my goal, which  
> is a package that can be installed on a stock OS-X (except Numerix, of  
> course). i.e. fink-free.
>
> However, it would probably work fine to have GTK compiled into the  
> binary, and it shouldn't break any of the other back-ends...it just  
> wouldn't work with PyGTK if PyGTK wasn't there, which is kind of  
> obvious.
>
> So, if someone want to build a package with PyGTK support, I'll send  
> you what I have to docs, and you can go to it. I'd love for there to  
> be only one "official" package, so if someone makes a superset of  
> mine, I won't distribute mine.
>
> -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...
>
>
> -------------------------------------------------------
> SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
> from IBM. Find simple to follow Roadmaps, straightforward articles,
> informative Webcasts and more! Get everything you need to get up to
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> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>

>>>>> "Mark" == Mark Bakker <ma...@gm...> writes:

    Mark> Hello - I wrote a small function that scales the axes so
    Mark> that the true scale (e.g.  the coordinates per inch) are the
    Mark> same along each axis.  This is useful when you contour
    Mark> spatial data where the x and y axes are in meters, for
    Mark> example. It is equivalent to the 'axis equal' command in
    Mark> matlab.  Except that once given that command in matlab it is
    Mark> persistent. Here you have to push the button every time you
    Mark> changed the figure window or zoom.

Hey Mark,

Did you know there is already an "equal" option to the axis command.
If it doesn't work right, could you fix it and send me a patch?

    Mark> I added the function to the toolbar2 class and added a
    Mark> button to the toolbar.  For the Tk backend this works great.
    Mark> And I don't think it is back-end dependent, but then again,
    Mark> what do I know.

    Mark> Any chance that such a button on the toolbar can be added to
    Mark> the official release?  Or are there better ways to do this?

This kind of button is useful to many but not others, and is a perfect
candidate for a modular toolbar.  We've talked in the past about
supporting customized toolbars, with a contrib module for user defined
tool functions.  But this has stalled in part because modifying the
toolbar across many GUIs is a pain.  One solution would be to use
matplotlib buttons in a GUI neutral toolbar -- then customizing it
would be trivial and would work for free across backends.  

Perhaps you should post a patch or code so others could test your
button and see if they like it enough to put it on the standard
toolbar until we get support for custom, extensible toolbars.

JDH

>>>>> "Alex" == Alex Rada <ale...@ya...> writes:

    Alex> Hi, I'm using matplotlib v0.82 an I would like know if there
    Alex> is the possibility to set the markerfacecolor to
    Alex> "transparent", so that I can see two markers when they are
    Alex> one above the other.

With plot, which generates lines, in principle you should be able to
set the alpha channel.  This controls the transparency of the edge and
the face (they aren't currently separable).  However, in testing, I
just noticed that the transparency is not respected for markers with
the *Agg backends, which I think is a consequence of the way I
optimized marker drawing several releases back.  I'll have to
investigate further.  Also, transparency is not respected across
backends, eg PS, GTK, WX.

You can use transparent markers with scatter:

    from pylab import *
    x,y = rand(2,100)
    scatter(x, y, s=300, alpha=0.5)
    show()

It would be useful to have a markerfacecolor='None' option, which
worked across backends, even those which don't support transparency.
If you think this is sufficiently useful, please file a sourceforge
support request.

Cheers,
JDH

On Wednesday 06 July 2005 8:47 am, Darren Dale wrote:

> y=load('bar.dat', delimiter=',')

I forgot to add that the option to specify a delimiter was introduced in 
matplotlib-0.81

Darren

On Wednesday 06 July 2005 7:08 am, Vidar Gundersen wrote:
> does pylab.load('data.txt') support other
> ASCII data formats than the following?
>
>     4.6   3.1   1.5   0.2
>     4.6   3.4   1.4   0.3
>     5.4   3.7   1.5   0.2
>     5.8   4.0   1.2   0.2
>     5.4   3.9   1.3   0.4
>
> ...like:
>
>     4.6;3.1;1.5;0.2
>     4.6;3.4;1.4;0.3
>     5.4;3.7;1.5;0.2
>     5.8;4.0;1.2;0.2
>     5.4;3.9;1.3;0.4

x=load('foo.dat', delimiter=';')

>     4.6, 3.1, 1.5, 0.2
>     4.6, 3.4, 1.4, 0.3
>     5.4, 3.7, 1.5, 0.2
>     5.8, 4.0, 1.2, 0.2
>     5.4, 3.9, 1.3, 0.4

y=load('bar.dat', delimiter=',')



Darren

scipy.io.read_array will do this

read_array(fileobject, separator=None, columns=None, comment='#', 
lines=None, at
ype='d', linesep='\n', rowsize=10000, missing=0)


Vidar Gundersen wrote:

>does pylab.load('data.txt') support other
>ASCII data formats than the following?
>
>    4.6   3.1   1.5   0.2
>    4.6   3.4   1.4   0.3
>    5.4   3.7   1.5   0.2
>    5.8   4.0   1.2   0.2
>    5.4   3.9   1.3   0.4
>
>...like:
>
>    4.6;3.1;1.5;0.2
>    4.6;3.4;1.4;0.3
>    5.4;3.7;1.5;0.2
>    5.8;4.0;1.2;0.2
>    5.4;3.9;1.3;0.4
>
>    4.6, 3.1, 1.5, 0.2
>    4.6, 3.4, 1.4, 0.3
>    5.4, 3.7, 1.5, 0.2
>    5.8, 4.0, 1.2, 0.2
>    5.4, 3.9, 1.3, 0.4
>
>etc.
>
>R http://www.r-project.org/, has a nice solution for this:
>
>x <- read.table(file="data.txt", sep=";", dec=".", quote="\"")
>
>
>
>-------------------------------------------------------
>SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
>from IBM. Find simple to follow Roadmaps, straightforward articles,
>informative Webcasts and more! Get everything you need to get up to
>speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click
>_______________________________________________
>Matplotlib-users mailing list
>Mat...@li...
>https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>  
>

does pylab.load('data.txt') support other
ASCII data formats than the following?

    4.6   3.1   1.5   0.2
    4.6   3.4   1.4   0.3
    5.4   3.7   1.5   0.2
    5.8   4.0   1.2   0.2
    5.4   3.9   1.3   0.4

...like:

    4.6;3.1;1.5;0.2
    4.6;3.4;1.4;0.3
    5.4;3.7;1.5;0.2
    5.8;4.0;1.2;0.2
    5.4;3.9;1.3;0.4

    4.6, 3.1, 1.5, 0.2
    4.6, 3.4, 1.4, 0.3
    5.4, 3.7, 1.5, 0.2
    5.8, 4.0, 1.2, 0.2
    5.4, 3.9, 1.3, 0.4

etc.

R http://www.r-project.org/, has a nice solution for this:

x <- read.table(file="data.txt", sep=";", dec=".", quote="\"")

Hi,

I'm using matplotlib v0.82 an I would like know if there is the 
possibility to set the markerfacecolor to "transparent", so that I can 
see two markers when they are one above the other.

Thank you.

Alex.

On 5 Jul 2005, at 17:00, John Hunter wrote:

>
> This is actually covered in the errorbar docstring, but subtly, so
> I'll elaborate here (and update the errorbar docs with this example)

Thank you John. Admittedly I overlooked that one.

Cheers,
Christian