matplotlib-users Mailing List for matplotlib (Page 11)

Hi,

I am making the following transformation inside a function:

...
transform = agg.trans_affine(*tm)
curve = agg.conv_curve_path(path)
transcurve = agg.conv_transform_curve(curve, transform)
stroke = agg.conv_stroke_transcurve(transcurve)
stroke.width(strokeWidth)
...

I am getting the strokeWidth* *and* *tm parameters outside the function. 
Is there any way the strokeWidth also to be affected by the 
transformation made?
For example if I scale a curve, its countour to be scaled also.

Thank you in advance!
Regards
Z.Danevska

Normally, this would have been a bugfix release, but I reorganized the
matplotlib configuration files so thought it best to tick the version
number.  All of the configuration files and dirs (matplotlibrc,
tex.cache, ttffont.cache ) now reside in $HOME/.matplotlib (on windows
C:\Documents and Settings\youracct\.matplotlib).  Please rename your
.matplotlibrc file to matplotlibrc and put it there.

Other changes are 


2005-07-07 Added Eric's MA set_xdata Line2D fix - JDH

2005-07-06 Made HOME/.matplotlib the new config dir where the
           matplotlibrc file, the ttf.cache, and the tex.cache live.
           The new default filenames in .matplotlib have no leading
           dot and are not hidden.  Eg, the new names are matplotlibrc
           tex.cache ttffont.cache.  This is how ipython does it so it
           must be right.  If old files are found, a warning is issued
           and they are moved to the new location.  Also fixed
           texmanager to put all files, including temp files in
           ~/.matplotlib/tex.cache, which allows you to usetex in
           non-writable dirs.


2005-07-05 Fixed bug #1231611 in subplots adjust layout.  The problem
           was that the text cacheing mechanism was not using the
           transformation affine in the key. - JDH

2005-07-05 Fixed default backend import problem when using API (SF bug
           # 1209354 -  see API_CHANGES for more info - JDH

2005-07-04 backend_gtk.py: require PyGTK version 2.0.0 or higher - SC

2005-06-30 setupext.py: added numarray_inc_dirs for building against
           numarray when not installed in standard location - ADS


2005-06-27 backend_svg.py: write figure width, height as int, not float.
           Update to fix some of the pychecker warnings - SC
  
2005-06-23 Updated examples/agg_test.py to demonstrate curved paths
           and fills - JDH

2005-06-21 Moved some texmanager and backend_agg tex caching to class
           level rather than instance level - JDH

2005-06-20 setupext.py: fix problem where _nc_backend_gdk is installed to the
           wrong directory - SC

2005-06-19 Added 10.4 support for CocoaAgg. - CM

2005-06-18 Move Figure.get_width_height() to FigureCanvasBase and return
           int instead of float. - SC

2005-06-18 Applied Ted Drain's QtAgg patch: 1) Changed the toolbar to
           be a horizontal bar of push buttons instead of a QToolbar
           and updated the layout algorithms in the main window
           accordingly.  This eliminates the ability to drag and drop
           the toolbar and detach it from the window.  2) Updated the
           resize algorithm in the main window to show the correct
           size for the plot widget as requested.  This works almost
           correctly right now.  It looks to me like the final size of
           the widget is off by the border of the main window but I
           haven't figured out a way to get that information yet.  We
           could just add a small margin to the new size but that
           seems a little hacky.  3) Changed the x/y location label to
           be in the toolbar like the Tk backend instead of as a
           status line at the bottom of the widget.  4) Changed the
           toolbar pixmaps to use the ppm files instead of the png
           files.  I noticed that the Tk backend buttons looked much
           nicer and it uses the ppm files so I switched them.


2005-06-17 Modified the gtk backend to not queue mouse motion events.
           This allows for live updates when dragging a slider. - CM

2005-06-17 Added starter CocoaAgg backend.  Only works on OS 10.3 for
           now and requires PyObjC.  (10.4 is high priority) - CM

2005-06-17 Upgraded pyparsing and applied Paul McGuire's suggestions
           for speeding things up.  This more than doubles the speed
           of mathtext in my simple tests. JDH

2005-06-16 Applied David Cooke's subplot make_key patch


Downloads at http://matplotlib.sf.net

Enjoy!
JDH

Alan G Isaac wrote:
> On Fri, 08 Jul 2005, Christian Kristukat apparently wrote: 
> 
>>Another problems concerns matplotlib on windows when 
>>starting scripts from IDLE that use the pylab interface. 
>>After calling show() the python shell never returns and 
>>has to be killed. 
> 
> 
> Even after you close the plot window?

yes. I start the script pressing F5 and it never returns.

Regards, Christian

On Fri, 08 Jul 2005, Christian Kristukat apparently wrote:=20
> Another problems concerns matplotlib on windows when=20
> starting scripts from IDLE that use the pylab interface.=20
> After calling show() the python shell never returns and=20
> has to be killed.=20

Even after you close the plot window?

Cheers,
Alan Isaac

Hi all,

when using matplotlib through the pylab interface arrays are not any longer 
printed on the screen if they are rather large, instead some message appears 
telling the size and type of the array. How can I avoid that and get all the output?
Another problems concerns matplotlib on windows when starting scripts from IDLE 
that use the pylab interface. After calling show() the python shell never 
returns and has to be killed. I'm not using any special backend choice.
Regards, Christian

Hi,

the values of the data I'd like to plot varies in a very small region. Th=
erefore all yticks are labelled the same (e.g. all 2.785e-5).
Is there a possibility to increase the number of digits?

Thanks,
Sascha

Hi,

the values of the data I'd like to plot varies in a very small region. Th=
erefore all yticks are labelled the same (e.g. all 2.785e-5). Is there a =
possibility to increase the number of digits?

Thanks,
Sascha

Torsten,

You have found a bug, and I have not yet tracked down the cause and 
solution.  In the meantime, a workaround (or superior alternative--see 
below) is to use set_data(x, y) instead of set_xdata and set_ydata.  See 
the attached modification of your demo, which also shows an alternative 
way of making the mask.

> Every time when I pass a masked array to set_xdata() I get an error
> "MA.MA.MAError: Mask and data are not compatible".
> 
> See http://www-users.rwth-aachen.de/torsten.bronger/hall.py for the
> code that provokes this error.  The "plot" command works: It
> produces a plot with the desired gap (realised by the masked array).
> However, the first line.set_xdata(x_values) fails, although I even
> didn't change the x_values.

set_xdata and set_ydata call set_data, so it is actually more efficient 
to call set_data in the first place.  (This seems odd; one might expect 
the opposite, with set_data calling set_xdata and set_ydata.)

Eric

>>>>> "Jos=E9" =3D=3D Jos=E9 Matos <ja...@fc...> writes:

    Jos=E9> Hi all, I have been following this list for some time, as
    Jos=E9> well as using and spreading the news about matplotlib for
    Jos=E9> all people I know and use python. :-)

    Jos=E9>   I would like also to thank all the developers for all the
    Jos=E9> amazing work that has been done on matplotlib, it helps me a
    Jos=E9> lot in my work.

    Jos=E9>   Now the reason why I am writing to this list is to ask
    Jos=E9> what is the preferred policy for packaging matplotlib as an
    Jos=E9> rpm for FC4. Yesterday was accepted in Fedora Extras and so
    Jos=E9> it should take a few days to be available.

    Jos=E9>   The packager choose to package matplotlib (called
    Jos=E9> python-matplotlib) with both dateutils and pytz packaged
    Jos=E9> together while I use to package it as 3 separate packages.

Hi Jos=E9,

I have thought this over a bit more after talking with Fernando Perez,
a FC user, and wanted to add that in regards to the pytz and dateutils
packages, I think it is fine to package them separately.  My main
motivation for including them in the distro was to keep the list of
dependencies small, and because these packages did not have win32
friendly installers; neither issue should concern the FC4 packagers.

I would emphasize vis-a-vis these dependencies that the packager
should make sure the following examples run:

    peds-pc311:~/python/projects/matplotlib> ls examples/*date*
    examples/date_demo1.py  examples/date_demo_convert.py
    examples/date_demo2.py  examples/date_demo_rrule.py

and in general that the script examples/backend_driver.py, which runs
a suite of examples over several image backends, should not generate
errors.

As I mentioned in a previous response, I hope to factor some of these
dependencies into a separate, optional matplotlib-deps package to ease
the installation burden on the users while making the setup as clean
as possible for package maintainers.

Let me know if I can offer any more help, and thanks for your work
promoting matplotlib!

JDH=20

Jeff wrote:
>> I was having some difficulty filling between two vertical 
>> lines, I don't think I can use axvline() with fill()? 

On Thu, 23 Jun 2005, John Hunter apparently wrote: 
> It sounds like axvspan is what you want ... if all you 
> want is shading across the vertical extent over an xrange, 
> axvspan is the function for you,

Can this work directly with dates?
E.g., the following works but is non-intuitive:

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.axvspan(dates[2],dates[3])
pylab.plot_date(dates, y, 'r-')
pylab.show()

Thanks,
Alan Isaac

Christopher Kang wrote:

> Could someone please assist me in what I need to do or let me know of
> a different way to get matplotlib and gtk/gtkagg to work on my mac? 
> I'm running Tiger on the mac.

Do you really need GTK?

If not, you can use the installer at:

www.pythonmac.org/packages

It should work with TK, wx and Agg. I've heard someone is working on a 
Cocoa back-end which would be great, but it's not available now.

If you do need GTK, then you need to go the all-fink route: everything 
fink, including python itself, gtk, pygtk, etc.

Maybe whoever is maintaining the fink package can help out with your 
problems.

-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...

Hello, I'm not sure I have the most efficient method for changing my
plot settings.  I have an application I wrote with maplotlib that allows
a user to plot data and change different plot settings like color and
line width etc.  Initially when the program is created I create a
default axes with no data plotted.  The user then loads the data and
presses a plot button.

Once the data is plotted, each time the user changes the settings (for
example they change the line color from red to blue) I call
axes.clear(), then I call plot() again and this time I use the keywords
to change the settings to (change the line color to blue) and then I
call canvas.draw() to redraw the canvas.

axes.clear()
axes.plot(array,color=color, linestyle=pattern, linewidth=width,
marker='None')
canvas.draw()

Is this the best way to do this?

Thanks.

Jeff

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

    Jeff> Hello, I'm using WXAgg for some simple plotting.  when I
    Jeff> change any of the settings in my figure and then call
    Jeff> canvas.draw() the figure that is redrawn is not the same
    Jeff> size as the old drawing until I resize my frame.  So
    Jeff> initially what I see is a new figure overlaying the old
    Jeff> figure.  However when I resize the frame the figure snaps to
    Jeff> the size it should be. How can I fix this so that the figure
    Jeff> draws correctly without having to resize my frame? Thanks.
 

example, example, example, please.  

It is really not possible for us to help you without an example that
exposes the problem.

JDH

Hello, I'm using WXAgg for some simple plotting.  when I change any of
the settings in my figure and then call canvas.draw() the figure that is
redrawn is not the same size as the old drawing until I resize my frame.
So initially what I see is a new figure overlaying the old figure.
However when I resize the frame the figure snaps to the size it should
be. How can I fix this so that the figure draws correctly without having
to resize my frame? Thanks.
 
  _____  

Jeffrey Thomas Peery
SeaMetrics, Inc.
Mechanical Engineer 
Jef...@Se...
253.872.0285 (fax)
253.872.0284 (phone)
  _____  

 

>>>>> "Torsten" == Torsten Bronger <br...@ph...> writes:

    Torsten> However, the datalim seems so implicitly include zero.
    Torsten> For example, if min(y_values) is 3, I still see the point
    Torsten> of origin.  How can I avoid this behaviour?

We're just doing what we're told here :-)

Your first plot call is

  y_values = total_number_values * [0.0]
  line, = plot(x_values, y_values)

So zero is *explicitly* included.  The datalim remember the history of
objects have have been added.  If you want them to ignore their
history, call 

ax.dataLim.update_numerix(x_values, y_values, True)

The third argument if True will cause the datalim to update it's
bounds ignoring history.   If False, it will update the bounds
including it's past history.

Note that in the original example you posted


for i in range(2*cycles):
    voltages = number_of_values * [i % 2 + 3]
    y_values[i * number_of_values : (i+1) * number_of_values] = \
                       voltages
    line.set_ydata(y_values)
    print min(y_values), max(y_values)
    ax.dataLim.update_numerix(x_values, y_values, True)


min(y_values) == 0

JDH

>>>>> "Brice" == Brice Thurin <B.P...@ci...> writes:

    Brice> Thank you for your help, I tried to do as you said and I
    Brice> got the following messages and then python quit: (I haven't
    Brice> planned to use PyGTK as I want to use WX.)  Many Thanks
    Brice> Brice

You have to set which GUI you want to use with the backend parameter
in the matplotlibrc configuration file.  Typically, people put a copy
of this in their HOME dir.  If you want to use WX, I suggest setting

backend : WXAgg

in your rc file.

You can obtain a default copy of the rc file at
http://matplotlib.sf.net/.matplotlibrc or in the matplotlib src
distribution.

JDH

>>>>> "David" =3D=3D David Abreu Rodriguez <dav...@ia...> writes:

    David> Hello, I am new in the list and new using matplotlib.

    David> I am using matplotlib version 0.74

    David> I want to write (in the title of a plot, for example) non
    David> ascii characters like =E1 or =E9, but I can't.  Other problem
    David> is writting mathtex expresions with normal text: I can't
    David> put 'title(r"test $\lambda$")' because I don't see the TeX
    David> character. I can write TeX characters only if I want to see
    David> the symbols.

matplotlib-0.74 introduced unicode support in the *Agg and PS backends
-- see examples/unicode_demo.py

Strings with "embedded mathtext" like (r"test $\lambda$") are
currently not supported but this is listed on the goals page -
http://matplotlib.sourceforge.net/goals.html.  You have to use
something like r"$\rm{test}\ \lambda$" currently.  This is discussed
in the mathtext class documentation at http://matplotlib.sourceforge.net/=
matplotlib.mathtext.html

matplotlib0.81 introduced mathtext support using TeX proper, see
http://matplotlib.sourceforge.net/screenshots.html#tex_demo and
http://matplotlib.sourceforge.net/matplotlib.texmanager.html

Hope this helps!
JDH

Hi David,

David Abreu Rodriguez wrote:
> Hello,
> 
> I am new in the list and new using matplotlib.
> 
> I am using matplotlib version 0.74
You might want to go with 0.82.
> 
> I want to write (in the title of a plot, for example) non ascii 
> characters like á or é, but I can't.
There were some problems when using e.g. date ticks (déc etc.), IRC they 
were fixed in 0.80.

For title and legend stuff I use decode along these lines:

title = self.selClientData[1].decode('iso-8859-1')

Hope this helps
Werner

> Other problem is writting mathtex expresions with normal text: I can't 
> put 'title(r"test $\lambda$")' because I don't see the TeX character. I 
> can write TeX characters only if I want to see the symbols.
> 
> thanks
> 
> 
> 
> -------------------------------------------------------
> SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
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> 

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

    Jeff> I added the .matplotlibrc file and that definitely
    Jeff> helps. Thanks.  Regarding the symbols, I changed your file
    Jeff> to the match mine and I get symbols. Here's the change I
    Jeff> made:

    ...snip...

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

If you are not passing a format string (eg 'r-') you need to
explicitly set the marker symbol.  For no marker at all, use the
string 'None'

  pylab.plot_date(dates, y, color ='r', marker='None', 
                  linestyle ='--',
                  linewidth = 1)

Using the string 'None' instead of the symbol None is a bit of a wart,
because None is currently interpreted to mean "use the rc default".

JDH

Hello,

I am new in the list and new using matplotlib.

I am using matplotlib version 0.74

I want to write (in the title of a plot, for example) non ascii=20
characters like =E1 or =E9, but I can't.
Other problem is writting mathtex expresions with normal text: I can't=20
put 'title(r"test $\lambda$")' because I don't see the TeX character. I=20
can write TeX characters only if I want to see the symbols.

thanks

Hello everyone and always, thank you for your tremendous help.  I was
just wondering, I need to get matplotlib to work on a mac but
unfortunately I've been running into some problems trying to get it to
work on a mac.  I tried by installing the unstable version from source
using fink and that has some parts of matplotlib working fine, but I
can't seem to import pylab.  Specifically, when matplotlib tries to
import pylab (from pylab import *), it eventually gets to
""from matplotlib._nc_backend_gdk import pixbuf_get_pixels_array"
ImportError: No module named _nc_backend_gdk.".  It seems like i don't
have a _nc_backend_gdk.so file that I need.

Could someone please assist me in what I need to do or let me know of
a different way to get matplotlib and gtk/gtkagg to work on my mac?=20
I'm running Tiger on the mac.

Thank you very much,
Chris

Thank you for your help, I tried to do as you said and I got the  
following messages and then python quit: (I haven't planned to use  
PyGTK as I want to use WX.)
Many Thanks
Brice

import pylab
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/font_manager.py:456: UserWarning: Could not open  
font file /Library/Fonts/NISC18030.ttf
   warnings.warn("Could not open font file %s"%fpath)
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/font_manager.py:456: UserWarning: Could not open  
font file /Library/Fonts/fonts.cache-1
   warnings.warn("Could not open font file %s"%fpath)
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/font_manager.py:456: UserWarning: Could not open  
font file /System/Library/Fonts/LastResort.dfont
   warnings.warn("Could not open font file %s"%fpath)
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
packages/matplotlib/font_manager.py:456: UserWarning: Could not open  
font file /System/Library/Fonts/Keyboard.dfont
   warnings.warn("Could not open font file %s"%fpath)
No module named pygtk
PyGTK version 1.99.16 or greater is required to run the GTK Matplotlib  
backends

On 6 Jul 2005, at 15:51, John Hunter wrote:

>>>>>> "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
>
>
Brice Thurin

Department of Optometry and Visual Science
City University, Northampton Square
London, EC1V 0HB, UK.
http://www.city.ac.uk/optometry/Luis/myresearch/Research/ 
scatteringproper.html
http://www.sharpeye.org/

Tel: +44 (0)20 7040 4157
Fax: +44(0)20 7040 8355
e-mail: B.P...@ci...

Hallöchen!

John Hunter <jdh...@ac...> writes:

> [...]
>
>
> OK, that helps.  The update of the data limits happens when you call
> plot and friends (technically plot calls ax.add_line which calls
> ax.update_datalim_numerix) .  If you manually set the xdata or ydata
> on the line object, you need to manually update the Axes datalim with
>
> ax = gca()
> for i in range(2*cycles):
>     voltages = number_of_values * [i % 2 + 3]
>     y_values[i * number_of_values : (i+1) * number_of_values] = \
>                        voltages
>     line.set_ydata(y_values)
>     ax.update_datalim_numerix(x_values, y_values)
>     ax.autoscale_view()
>
>     draw()
>     time.sleep(1)

However, the datalim seems so implicitly include zero.  For example,
if min(y_values) is 3, I still see the point of origin.  How can I
avoid this behaviour?

Tschö,
Torsten.

-- 
Torsten Bronger, aquisgrana, europa vetus

Hallöchen!

Eric Firing <ef...@ha...> writes:

> [...]
>
> This looks to me like a place where you should try using masked arrays 
> instead of NaN.

Every time when I pass a masked array to set_xdata() I get an error
"MA.MA.MAError: Mask and data are not compatible".

See http://www-users.rwth-aachen.de/torsten.bronger/hall.py for the
code that provokes this error.  The "plot" command works: It
produces a plot with the desired gap (realised by the masked array).
However, the first line.set_xdata(x_values) fails, although I even
didn't change the x_values.

Tschö,
Torsten.

-- 
Torsten Bronger, aquisgrana, europa vetus

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