matplotlib-users Mailing List for matplotlib (Page 7)

On Nov 15, 2007 7:47 AM, Christian Meesters <mee...@un...> wrote:
> Hi,
>
> Sorry, if this has been brought up before, but I missed a while reading
> the list.
>
> When I updated my system lately, I also installed the current version of
> mpl (0.90.1) and that gave me a DeprecationWarning that I should use
> LineCollection now to get my horizontal lines. Well, I didn't figure out
> how to do that until now.

I think you misread the warning on hlines.  You can still use hlines,
just don't pass the "fmt" keyword argument.  Instead, use the keyword
arguments of the LineCollection, eg,

                 colors       = None,
                 antialiaseds  = None,
                 linestyle = 'solid',
                 offsets = None,
                 transOffset = None,#transforms.identity_transform(),
                 norm = None,
                 cmap = None,
                 pickradius = 5,

> TypeError: CXX : Error creating object of type
> N2Py7SeqBaseINS_6ObjectEEE

This error typically arises when the CXX extension code is expecting a
sequence but getting something different.  I can't reproduce it here,
but I am running mpl svn and not 0.90.1. Are you installing from src
or a binary package.  In any case, make sure you have a clean install
(remove site-packages/matplotlib and if building from src your "build"
subdirectory before reinstalling).

Can another 0.90.1 user confirm that this is a problem on that version?

JDH

Hi,

Sorry, if this has been brought up before, but I missed a while reading
the list.

When I updated my system lately, I also installed the current version of
mpl (0.90.1) and that gave me a DeprecationWarning that I should use
LineCollection now to get my horizontal lines. Well, I didn't figure out
how to do that until now.
(NB I have an own wxpython app which makes heavy use of mpl and mostly
uses subplot instances.)

Well, this code snippet 

from pylab import *
from matplotlib.collections import LineCollection

x = subplot(211)
x.add_collection(LineCollection([(0,0)]))

gives the following Traceback:

Exception in Tkinter callback
Traceback (most recent call last):
  File "lib-tk/Tkinter.py", line 1406, in __call__
    return self.func(*args)
  File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_tkagg.py",
line 151, in resize
    self.show()
  File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_tkagg.py",
line 154, in draw
    FigureCanvasAgg.draw(self)
  File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_agg.py",
line 392, in draw
    self.figure.draw(renderer)
  File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line
601, in draw
    for a in self.axes: a.draw(renderer)
  File "/usr/lib/python2.5/site-packages/matplotlib/axes.py", line 1286,
in draw
    a.draw(renderer)
  File "/usr/lib/python2.5/site-packages/matplotlib/collections.py",
line 700, in draw
    transoffset)
TypeError: CXX : Error creating object of type
N2Py7SeqBaseINS_6ObjectEEE

The traceback is independent of the backend used, same for wxagg at
least.

Guess, I'm missing something stupid. Can somebody enlighten me?

Thanks,
Christian

Jed Frechette wrote:
> 
> 
> Scott Cooper wrote:
>> 
>> sent to:  mat...@li...
>> 
>> I'm attempting to install matplotlib under version 10.5 ("Leopard") of  
>> the Macintosh operating system.
>> 
>> I had an old installation, via Fink, which broke when I (foolishly)  
>> upgraded from version 10.4 to version 10.5.
>> 
> 
> You might want to try reinstalling Fink. I did a bootstrap install of Fink
> on a new 10.5 install and matplotlib is working fine. Several other tools
> that I use are still missing from Fink on 10.5 but I haven't had any
> problems with matplotlib so far.
> 
> Best of luck,
> 
> --
> Jed Frechette
> University of New Mexico Lidar Lab
> 

Per Jed's suggestion, I did a boostrap install of Fink, into a virgin /sw
directory, then
     /sw/bin/fink --trees=unstable install matplotlib-py24

which failed with
	Could not resolve inconsistent dependencies!
	Fink isn't sure how to install the above packages safely. You may be able
to fix things by running:
	  fink scanpackages
	  sudo apt-get update
	  sudo apt-get install bzip2-dev=1.0.3-1 bzip2-shlibs=1.0.3-1

which I did, with the following result:
	Sorry, bzip2-dev is already the newest version.
	Sorry, bzip2-shlibs is already the newest version.
	0 packages upgraded, 0 newly installed, 0 to remove and 0  not upgraded.

-- 
View this message in context: http://www.nabble.com/Installing-under-Leopard-%28Mac-OSX-10.5%29-tf4798891.html#a13761021
Sent from the matplotlib - users mailing list archive at Nabble.com.

Wx rotates text around a different origin (the upper left) than most of 
the other backends (the lower left).  I've added a bit of code to 
correct for this.

But I also second John's suggestion about using WxAgg if you can.

Cheers,
Mike

Day, Michael A. AMRDEC/SimTech wrote:
> Classification:  UNCLASSIFIED 
> Caveats: NONE
> 
> Howdy,
> 
> When using Wx as the backend and plotting a line: the y axis label is
> overlapping with the y axis ticks.  This only appears to happen when
> using Wx; when using Tk, the label appears as expected.
> 
> I have tried many things suggested by mail archives and Google searches:
> 
> 1. Change font size/face in ticks.
> 2. Change font size/face in label.
> 3. Use subplots_adjust.
> 4. Use custom axes.
> 
> The label still ALWAYS overlaps the ticks.  It looks like the label is
> being rendered on top of the ticks no matter what location the ticks are
> at.
> 
> Am I missing something or is this a bug?
> 
> Sample of what I'm trying to do:
> 
> --------------------------
> import matplotlib
> matplotlib.use('Wx')
> 
> import pylab
> 
> pylab.title ("Intial Velocity vs Residual Velocity")
> pylab.xlabel ("Initial Velocity")
> 
> #There is a bug in matplotlib -- the ylabel overlaps the yticks
> #when using Wx
> pylab.ylabel ("Residual Velocity", verticalalignment='top')
> 
> pylab.plot ([1, 2, 3, 4], [1, 2, 3, 4])
> 
> pylab.show ()
> --------------------------
> 
> Thanks ahead of time,
> 
> Michael Day
> Simulation Technologies, Inc.
> Building 5400 Room C228
> Redstone Arsenal, AL  35898
> 
>  
> Classification:  UNCLASSIFIED 
> Caveats: NONE
> 
> 
> -------------------------------------------------------------------------
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

Scott Cooper wrote:
> 
> sent to:  mat...@li...
> 
> I'm attempting to install matplotlib under version 10.5 ("Leopard") of  
> the Macintosh operating system.
> 
> I had an old installation, via Fink, which broke when I (foolishly)  
> upgraded from version 10.4 to version 10.5.
> 

You might want to try reinstalling Fink. I did a bootstrap install of Fink
on a new 10.5 install and matplotlib is working fine. Several other tools
that I use are still missing from Fink on 10.5 but I haven't had any
problems with matplotlib so far.

Best of luck,

--
Jed Frechette
University of New Mexico Lidar Lab
-- 
View this message in context: http://www.nabble.com/Installing-under-Leopard-%28Mac-OSX-10.5%29-tf4798891.html#a13754006
Sent from the matplotlib - users mailing list archive at Nabble.com.

Classification:  UNCLASSIFIED=20
Caveats: NONE

Yep, I can use that. =20

Not only did that solve the yaxis label issue, EVERYTHING works much
better now.  Under "Wx" there was some delay when resizing the window,
and the lines didn't look as good.

Thanks a lot!

-----Original Message-----
From: John Hunter [mailto:jd...@gm...]=20
Sent: Wednesday, November 14, 2007 12:35 PM
To: Day, Michael A. AMRDEC/SimTech
Cc: mat...@li...
Subject: Re: [Matplotlib-users] Y axis label overlaps with ticks when
using Wx (UNCLASSIFIED)

On Nov 14, 2007 11:31 AM, Day, Michael A. AMRDEC/SimTech
<mik...@us...> wrote:

> Sample of what I'm trying to do:
>
> --------------------------
> import matplotlib
> matplotlib.use('Wx')


Is it possible for you to use WXAgg -- this is the recommended backend
for wx users.  The only advantage of native wx that I am aware of is
when running under X11 in some environments.

JDH
Classification:  UNCLASSIFIED=20
Caveats: NONE

On Nov 14, 2007 11:31 AM, Day, Michael A. AMRDEC/SimTech
<mik...@us...> wrote:

> Sample of what I'm trying to do:
>
> --------------------------
> import matplotlib
> matplotlib.use('Wx')


Is it possible for you to use WXAgg -- this is the recommended backend
for wx users.  The only advantage of native wx that I am aware of is
when running under X11 in some environments.

JDH

Classification:  UNCLASSIFIED=20
Caveats: NONE

Howdy,

When using Wx as the backend and plotting a line: the y axis label is
overlapping with the y axis ticks.  This only appears to happen when
using Wx; when using Tk, the label appears as expected.

I have tried many things suggested by mail archives and Google searches:

1. Change font size/face in ticks.
2. Change font size/face in label.
3. Use subplots_adjust.
4. Use custom axes.

The label still ALWAYS overlaps the ticks.  It looks like the label is
being rendered on top of the ticks no matter what location the ticks are
at.

Am I missing something or is this a bug?

Sample of what I'm trying to do:

--------------------------
import matplotlib
matplotlib.use('Wx')

import pylab

pylab.title ("Intial Velocity vs Residual Velocity")
pylab.xlabel ("Initial Velocity")

#There is a bug in matplotlib -- the ylabel overlaps the yticks
#when using Wx
pylab.ylabel ("Residual Velocity", verticalalignment=3D'top')

pylab.plot ([1, 2, 3, 4], [1, 2, 3, 4])

pylab.show ()
--------------------------

Thanks ahead of time,

Michael Day
Simulation Technologies, Inc.
Building 5400 Room C228
Redstone Arsenal, AL  35898

=20
Classification:  UNCLASSIFIED=20
Caveats: NONE

Hi everybody,

I have sent this email before today, but I wasn't a member back then. So 
I don't know if it was sent. Anyway I am sending it again, if anyone 
knows how to color the plot_surface function (along an axis perhaps), 
please share your knowledge.

Thanks,
Seyit

Seyit Hocuk wrote:
> Hi to the list,
>
> This will be my first post here. I want to give a color(s) to my 3d 
> surface plot with matplotlib. How do I do that. Is there an argument 
> for (pseudo)color? There is no good explenation anywhere for 
> plot_surface.
>
> Thanks,
> Seyit
>

Rob Hetland wrote:
> I would like to use sans-serif math fonts in mathtext (inspired by  
> Tufte -- most of his examples use sans fonts).

Thought you might want to know that matplotlib now supports the 
sans-serif glyphs in the STIX fonts.  Just set the rcParam 
"mathtext.fontset" to "stixsans".  The results are pretty nice.

Cheers,
Mike

-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

I am having a similar problem.  However I can't seem to get matplotlib
to compile at all.  It fails when it can't find png.h.
At the beginning, it says it can find freetype and libpng, but can't
find the appropriate header files.  I have found them here:

/Developer/SDKs/MacOSX10.5.sdk/usr/X11/include

So the question is, how can I/we get matplotlib to use the included
versions of freetype and libpng instead of downloading and compiling
other versions?

Thanks,
Jeremy


On Nov 13, 2007 11:01 AM, Scott Cooper <se...@ad...> wrote:
> sent to:  mat...@li...
>
> I'm attempting to install matplotlib under version 10.5 ("Leopard") of
> the Macintosh operating system.
>
> I had an old installation, via Fink, which broke when I (foolishly)
> upgraded from version 10.4 to version 10.5.
>
> In principle, installing matplotlib under 10.5 should be simple,
> because Leopard already includes all of matplotlib's dependencies:
>         Python 2.4 (and 2.5)
>         numpy
>         libpng
>         zlib
>         freetype
>
> In practice, I seem to be running into trouble with freetype.
>
> I built matplotlib version 0.90.1 from source, and installed it in /
> Library/Python/2.5/site-packages
>
> When I run python2.5 and import pylab, the import looks for freetext.
> 6.dylib in /sw/lib/freetype219/lib/libfreetype.6.dylib (i.e. the
> broken Fink installation, incompatable with Leopard) which results in
> a bus error. (My reasons for this assertion are given below.)  There's
> a (presumably Leopard-compatable) version of libfreetype.6.dylib in /
> usr/X11/lib/libfreetype.6.dylib
>
> ...so, my problem seems to be, how do I get matplotlib to look for
> libfreetype.6.dylib in the right place?
>
> I have tried changing setup.py Specifically, I've replaced
>         'darwin' : ['/sw/lib/freetype2', '/sw/lib/freetype219', '/usr/local',
> '/usr', '/sw'],
> with
>         'darwin' : ['/usr/X11', '/usr/X11/lib', '/usr/X11/include', '/usr/X11/
> include/freetype2', '/usr/local','/usr'],
> Which does not solve the problem (does not change anything at all, as
> far as I can tell).
>
> I've not been able to locate an explicit reference to the /sw
> directory anywhere else in setupext.py, or in setup.py
>
> APPENDIX:  why am I convinced that pylab is looking for freetype.
> 6.dylib in /sw/lib/freetype219/lib/  ?
>
> First, when I get the bus error, a window pops up saying that Python's
> "unexpected quit" (=crash) may be due to "freetype.6.dylib"
>
> Second, when I click the "report" button in this window, I see many
> pages of debugging info which I don't know how to interpret, but which
> includes this line:
>         0x1226000 -  0x1279ff3 +libfreetype.6.dylib ??? (???) /sw/lib/
> freetype219/lib/libfreetype.6.dylib
>
> Third, when I temporarily remove the entire /sw/lib/freetype219
> directory from /sw/lib then run python2.5 and import pylab, I no
> longer get a bus error, but I *do* now get *this* error:
>         ImportError: dlopen(/Library/Python/2.5/site-packages/matplotlib/
> ft2font.so, 2): Library not loaded: /sw/lib/freetype219/lib/
> libfreetype.6.dylib
>    Referenced from: /Library/Python/2.5/site-packages/matplotlib/
> ft2font.so
>    Reason: image not found
>
> I am going to try some monkey business along the lines of
>         ln /usr/X11/lib/libfreetype.6.dylib /sw/lib/freetype219/lib/
> libfreetype.6.dylib
> and will let you know the results.  However, even if that works, it's
> a heinous kluge, and probably fragile, too.
>
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems?  Stop.
> Now Search log events and configuration files using AJAX and a browser.
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>

sent to:  mat...@li...

I'm attempting to install matplotlib under version 10.5 ("Leopard") of  
the Macintosh operating system.

I had an old installation, via Fink, which broke when I (foolishly)  
upgraded from version 10.4 to version 10.5.

In principle, installing matplotlib under 10.5 should be simple,  
because Leopard already includes all of matplotlib's dependencies:
	Python 2.4 (and 2.5)
	numpy
	libpng
	zlib
	freetype
	
In practice, I seem to be running into trouble with freetype.

I built matplotlib version 0.90.1 from source, and installed it in / 
Library/Python/2.5/site-packages

When I run python2.5 and import pylab, the import looks for freetext. 
6.dylib in /sw/lib/freetype219/lib/libfreetype.6.dylib (i.e. the  
broken Fink installation, incompatable with Leopard) which results in  
a bus error. (My reasons for this assertion are given below.)  There's  
a (presumably Leopard-compatable) version of libfreetype.6.dylib in / 
usr/X11/lib/libfreetype.6.dylib

...so, my problem seems to be, how do I get matplotlib to look for  
libfreetype.6.dylib in the right place?

I have tried changing setup.py Specifically, I've replaced
	'darwin' : ['/sw/lib/freetype2', '/sw/lib/freetype219', '/usr/local',  
'/usr', '/sw'],
with
	'darwin' : ['/usr/X11', '/usr/X11/lib', '/usr/X11/include', '/usr/X11/ 
include/freetype2', '/usr/local','/usr'],
Which does not solve the problem (does not change anything at all, as  
far as I can tell).

I've not been able to locate an explicit reference to the /sw  
directory anywhere else in setupext.py, or in setup.py

APPENDIX:  why am I convinced that pylab is looking for freetype. 
6.dylib in /sw/lib/freetype219/lib/  ?

First, when I get the bus error, a window pops up saying that Python's  
"unexpected quit" (=crash) may be due to "freetype.6.dylib"

Second, when I click the "report" button in this window, I see many  
pages of debugging info which I don't know how to interpret, but which  
includes this line:
	0x1226000 -  0x1279ff3 +libfreetype.6.dylib ??? (???) /sw/lib/ 
freetype219/lib/libfreetype.6.dylib
	
Third, when I temporarily remove the entire /sw/lib/freetype219  
directory from /sw/lib then run python2.5 and import pylab, I no  
longer get a bus error, but I *do* now get *this* error:
	ImportError: dlopen(/Library/Python/2.5/site-packages/matplotlib/ 
ft2font.so, 2): Library not loaded: /sw/lib/freetype219/lib/ 
libfreetype.6.dylib
   Referenced from: /Library/Python/2.5/site-packages/matplotlib/ 
ft2font.so
   Reason: image not found

I am going to try some monkey business along the lines of
	ln /usr/X11/lib/libfreetype.6.dylib /sw/lib/freetype219/lib/ 
libfreetype.6.dylib
and will let you know the results.  However, even if that works, it's  
a heinous kluge, and probably fragile, too.

Jeff,

I think you need to delete the WXAgg accelerator module in your "site- 
packages/matplotlib/backends" directory.  It will have a name like  
"_wxagg.so", "_wxagg.pyd", or "_wxagg.dll".

Ken

Thomas Schmelzer wrote:
> Hello experts,
> I have two matrices (one random matrix with entries between -3 and +3 
> and one with entries say between -4 and 4).
> I would like to plot a contourf for both of them with corresponding 
> color scheme (ranging say from -5 to 5).
> I am a newbie, so please apologize the rather low level of this question.
> cheers
> Thomas

The simplest way is to use the same array of contour levels for both. 
Here is a simplest-possible code fragment to illustrate:

from pylab import *
F = 6 * (rand(20,20) - 0.5)
G = 8 * (rand(20,20) - 0.5)
clevs = arange(-5,6)
subplot(2,1,1)
contourf(F, clevs)
colorbar()
subplot(2,1,2)
contourf(G, clevs)
colorbar()
show()

For additional information:
1) In the matplotlib examples directory, look for all the examples that 
use contourf.
2) Look at the contourf (and other) docstrings.

If you are not already using ipython, get it and try it--it makes the 
experimentation and learning much easier.

Eric

Johann Cohen-Tanugi wrote:
> hello,
> is there a quick way to get a figure in greyscale?

You can do something like plot([1,2,3], color='0.9'), where the string '0.9' 
denotes the gray scale of the plotted line. See also `help plot`, `help colors`.

-- 
cheers,
steve

Random number generation is the art of producing pure gibberish as quickly as 
possible.

hello,
is there a quick way to get a figure in greyscale?
thanks,
Johann

I have this problem with the embedding samples that use wxagg. Otherwise, I
have no problem.

Jeff > do you import something using wxagg ?

Matthieu

2007/11/12, Michael Droettboom <md...@st...>:
>
> Can you send the entire traceback you get with this error?  I'm curious
> which module is requiring this.
>
> Also, if you start a python console and type "import wx", do you get
> this error?
>
> Cheers,
> Mike
>
> Jeff Peery wrote:
> > Hello, thanks for the response. I changed my matplotlibrc file from
> > 'WxAgg' to 'Wx'. I'm still using wxpython 2.8 and matplotlib 0.90.1, and
> > I am still getting the error that wxmsw26uh_vc.dll cannot be found. what
> > else can I do? can I just put this file in the place that it is trying
> > to look?
> >
> > thanks,
> > Jeff
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Tired of spam? Yahoo! Mail has the best spam protection around
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> >
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> >
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> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > Matplotlib-users mailing list
> > Mat...@li...
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
> --
> Michael Droettboom
> Science Software Branch
> Operations and Engineering Division
> Space Telescope Science Institute
> Operated by AURA for NASA
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems?  Stop.
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-- 
French PhD student
Website : http://miles.developpez.com/
Blogs : http://matt.eifelle.com and http://blog.developpez.com/?blog=92
LinkedIn : http://www.linkedin.com/in/matthieubrucher

Can you send the entire traceback you get with this error?  I'm curious 
which module is requiring this.

Also, if you start a python console and type "import wx", do you get 
this error?

Cheers,
Mike

Jeff Peery wrote:
> Hello, thanks for the response. I changed my matplotlibrc file from 
> 'WxAgg' to 'Wx'. I'm still using wxpython 2.8 and matplotlib 0.90.1, and 
> I am still getting the error that wxmsw26uh_vc.dll cannot be found. what 
> else can I do? can I just put this file in the place that it is trying 
> to look?
>  
> thanks,
> Jeff
> 
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
> 
> 
> ------------------------------------------------------------------------
> 
> -------------------------------------------------------------------------
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> Still grepping through log files to find problems?  Stop.
> Now Search log events and configuration files using AJAX and a browser.
> Download your FREE copy of Splunk now >> http://get.splunk.com/
> 
> 
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

Hello experts,
I have two matrices (one random matrix with entries between -3 and +3 and
one with entries say between -4 and 4).
I would like to plot a contourf for both of them with corresponding color
scheme (ranging say from -5 to 5).
I am a newbie, so please apologize the rather low level of this question.
cheers
Thomas

Hi,

> > There 
> > may be a reason it was done in the less straightforward way that aren't
> > obvious to you or I (perhaps to ease embedding... just guessing).
> 
> I don't think we can use the QMainWindow's addToolBar for this. It creates 
a 
> single toolbar for the entire window, but what if we want to add two 
> canveses, each with its own toolbar, in a single window? I am writing an 
> application that does this.

Well, technically this is not a problem, since you can add several toolbars
with addToolBar. But well, you are right, this would look awkward, two
times the same toolbar... But anyhow, I am calling addToolBar in the class
FigureManagerQT, which is not able to handle more than one plot in a 
window it seems to me (am I missing something?). If, on the other
hand, you create your own QMainWindow, there is no problem putting the
toolbar like it was done classically. I added an example for that to the
patch request ID 1828848 (Qt4 backend improvement). I don't know your
code, but it is possible, maybe even probable, that it works even
with my modifications, as I did not change the class structure.
Only possible incompatibilities I could see is if you are inheriting
FigureManagerQT and doing something in there.

So in the end I think my patch is still a good idea. It might be needed
to change it to keep compatibility with old code, though.

Greetings,

Martin

John,

On Nov 10, 2007 2:41 AM, John Hunter <jd...@gm...> wrote:
> > Now that is a well focused question.

Thank  you for your teaching. ^_^.

>
> A little googling revealed that
> > when a gtk drawing area (eg an matplotlib canvas) is placed in a gtk
> > notebook, it needs to have the focus to receive key press events.

Thank you for the information. It's really the point.

> I had hoped it would be enough to do
>   canvas.grab_focus()
> but apparently it is not (upon testing).  But the suggestion from the
> link above to use TAB to grab the focus worked in my tests.

> With a little more testing, I find if I grab the focus after showing
> the window that the notebook is in, it works as expected:

Thank you for your patient test.
Just for information, it is also workable to set current page for
notebook firstly and then grab focus for the drawing area, such as
notebook.set_current_page(pageno)
canvas.grab_focus()     #canvas is the view embedded in page $pageno

Thanks again for your help.
-- 
sunzen
<<freedom & enjoyment>>

Thanks

That was just what I was looking for.
The bihistogram solution is interesting too, but I think I will to
with alpha since I might want to use a log y scale.

Regards
Neil

On Nov 12, 2007 3:06 PM, Eric Firing <ef...@ha...> wrote:
>
> Neil M wrote:
> > Hello,
> >
> > Is it possible to plot two histograms on the same axis without having
> > the bars on top of each other.
> >
> > I'm trying to determine how similar a distribution of activity is
> > between a large data set and a small subset.
> >
> > I have 2 million records with a last activity date.  I can plot both
> > the sample and the full population on a normalized histogram, and in
> > different colours but the later plot covers smaller values of the
> > earlier one.
> >
> > Thanks
> > Neil
>
> Neil,
>
> I can think of two alternatives.  If one of the two distributions has
> all values higher than the other, so you want it to be behind, then you
> can use the zorder property of the patches.  From your description it
> sounds like this is the case.  If not, however, you can set the alpha
> property so that both sets of bars are semi-transparent.
>
> Both of these properties can be passed in as kwargs to the hist() function:
>
> hist(randn(200), edgecolor='r', zorder=5, alpha=0.5)
> hist(randn(500), edgecolor='g', zorder=4, alpha=0.5)
>
> Eric
>
> >
> > -------------------------------------------------------------------------
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>
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> > Mat...@li...
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>

Neil M wrote:
> Hello,
> 
> Is it possible to plot two histograms on the same axis without having
> the bars on top of each other.
> 
> I'm trying to determine how similar a distribution of activity is
> between a large data set and a small subset.
> 
> I have 2 million records with a last activity date.  I can plot both
> the sample and the full population on a normalized histogram, and in
> different colours but the later plot covers smaller values of the
> earlier one.
> 
> Thanks
> Neil

Neil,

I can think of two alternatives.  If one of the two distributions has 
all values higher than the other, so you want it to be behind, then you 
can use the zorder property of the patches.  From your description it 
sounds like this is the case.  If not, however, you can set the alpha 
property so that both sets of bars are semi-transparent.

Both of these properties can be passed in as kwargs to the hist() function:

hist(randn(200), edgecolor='r', zorder=5, alpha=0.5)
hist(randn(500), edgecolor='g', zorder=4, alpha=0.5)

Eric

> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems?  Stop.
> Now Search log events and configuration files using AJAX and a browser.
> Download your FREE copy of Splunk now >> http://get.splunk.com/
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

See below for Antonio Gonzalez solution (last year)  that I have started 
using and happy with it

Neil M wrote:
> Hello,
>
> Is it possible to plot two histograms on the same axis without having
> the bars on top of each other.
>
> I'm trying to determine how similar a distribution of activity is
> between a large data set and a small subset.
>
> I have 2 million records with a last activity date.  I can plot both
> the sample and the full population on a normalized histogram, and in
> different colours but the later plot covers smaller values of the
> earlier one.
>
> Thanks
> Neil
>   

-------- Original Message --------
Subject: 	Re: [Matplotlib-users] plotting overlapped histograms
Date: 	Mon, 13 Nov 2006 19:02:03 +0100
From: 	Antonio Gonzalez <Ant...@ki...>
To: 	David E. Konerding <dek...@lb...>
CC: 	Mat...@li...
References: 	<455...@lb...>



To compare two histograms you can plot a bihistogram as suggested on
http://www.itl.nist.gov/div898/handbook/eda/section3/bihistog.htm

The little function I've written to do so is below. See if it helps.

Antonio



import scipy
from pylab import figure

def bihist(y1, y2, nbins=10, h=None):
	'''
	Bihistogram.
	h is an axis handle. If not present, a new figure is created.
	'''
	if h is None: h = figure().add_subplot(111)
	xmin = scipy.floor(scipy.minimum(y1.min(), y2.min()))
	xmax = scipy.ceil(scipy.maximum(y1.max(), y2.max()))
	bins = scipy.linspace(xmin, xmax, nbins)
	n1, bins1, patch1 = h.hist(y1, bins)
	n2, bins2, patch2 = h.hist(y2, bins)
	# set ymax:
	ymax = 0
	for i in patch1:
		height = i.get_height()
		if height > ymax: ymax = height
	# invert second histogram and set ymin:
	ymin = 0
	for i in patch2:
		height = i.get_height()
		height = -height
		i.set_height(height)
		if height < ymin: ymin = height
	h.set_ylim(ymin*1.1, ymax*1.1)		
	h.figure.canvas.draw()

_______________________________________________
Matplotlib-users mailing list
Mat...@li...
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Hello,

Is it possible to plot two histograms on the same axis without having
the bars on top of each other.

I'm trying to determine how similar a distribution of activity is
between a large data set and a small subset.

I have 2 million records with a last activity date.  I can plot both
the sample and the full population on a normalized histogram, and in
different colours but the later plot covers smaller values of the
earlier one.

Thanks
Neil