matplotlib-users Mailing List for matplotlib (Page 12)

Anyone can give me an help, please ?
Emanuele Passera
Software Engineer
Tele-Rilevamento Europa - T.R.E. srl
Via Vittoria Colonna, 7
20149 Milano – Italia
Tel.: +39.02.4343.121 - Fax: +39.02.4343.1230
ema...@tr... - www.treuropa.com
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On Thu, Apr 21, 2011 at 5:38 PM, Emanuele Passera <
ema...@tr...> wrote:
> Hello everybody,
>
> I am experiencing a strange behavior with the scatter() function when
> using different figure canvas y dimensions in inches.
>
> Executing the code listed below, I obtain good images when using some
> dimensions
> and totally white images when using others.
> I have attached the input data buffers and the resulting images too.
>
> #!/usr/bin/python
>
> import numpy as n
> import pylab as p
>
> def scatterFun(x, y, data, yCanvasDimInches, imageName):
> """ This function draws a scatterogram for the input data. """
> canvasObj = p.figure(figsize=(8, yCanvasDimInches), dpi=100)
> axisObj = canvasObj.add_axes([0, 0, 1, 1])
> axisObj.scatter(x, y, 10, data, 'o')
> canvasObj.savefig(imageName, dpi=100)
> p.close()
>
>
> # data buffer files
> yPosFile = "/users/lelepass/python/test_scatter/yPos"
> xPosFile = "/users/lelepass/python/test_scatter/xPos"
> dataFile = "/users/lelepass/python/test_scatter/data"
> # loading data
> s = file(dataFile, 'rb').read()
> data = n.fromstring(s, 'f')
> s = file(yPosFile, 'rb').read()
> y = n.fromstring(s, 'd')
> s = file(xPosFile, 'rb').read()
> x = n.fromstring(s, 'd')
>
> # scatterogram generation
> scatterFun(x, y, data, 6, "pippo1.png")
> scatterFun(x, y, data, 6.01, "pippo2.png")
> scatterFun(x, y, data, 6.015, "pippo3.png")
> scatterFun(x, y, data, 6.02, "pippo4.png")
> scatterFun(x, y, data, 6.028, "pippo5.png")
> scatterFun(x, y, data, 6.03, "pippo6.png")
>
> Can anyone help me ?
>
> I use
> Linux openSUSE 11.3 (x86_64)
> Linux sat1 2.6.34.7-0.7-default #1 SMP 2010年12月13日 11:13:53 +0100 x86_64
> x86_64 x86_64 GNU/Linux
> Python 2.6.5
> numpy 1.5.1
> matplotlib 1.0.1 with backend Agg v2.2
>
> On the same system descripted above linking matplotlib from svn
> matplotlib-matplotlib-v1.0.1-756-g3c43d83.tar.gz instead of the installed
> one,
> all the images are white.
>
> If it can be of some help this strange behavior does not appear with a
> system
> Linux Ubuntu 9.10
> Linux joshua 2.6.28-11-server #42-Ubuntu SMP Fri Apr 17 02:48:10 UTC 2009
> i686 GNU/Linux
> Python 2.6.4
> numpy 1.3.0
> matplotlib 0.99.0 with backend Agg v2.2
>
> Executing the script with verbosity I get the subsequent output
>
> $HOME=/users/lelepass
> CONFIGDIR=/users/lelepass/.matplotlib
>
> Bad key "numerix" on line 30 in
> /users/lelepass/.matplotlib/matplotlibrc.
> You probably need to get an updated matplotlibrc file from
> http://matplotlib.sf.net/_static/matplotlibrc or from the matplotlib
> source
> distribution
> matplotlib data path /usr/lib64/python2.6/site-packages/matplotlib/mpl-data
> loaded rc file /users/lelepass/.matplotlib/matplotlibrc
> matplotlib version 1.0.1
> verbose.level helpful
> interactive is False
> units is True
> platform is linux2
> Using fontManager instance from /users/lelepass/.matplotlib/fontList.cache
> backend agg version v2.2
> findfont: Matching
> :family=sans-serif:style=normal:variant=normal:weight=normal:stretch=normal:size=medium
> to Bitstream Vera Sans
> (/usr/lib64/python2.6/site-packages/matplotlib/mpl-data/fonts/ttf/Vera.ttf)
> with score of 0.000000
>
>
> Thank you all.
> Bye.
>
> Emanuele Passera
>
> Software Engineer
>
> Tele-Rilevamento Europa - T.R.E. srl
> Via Vittoria Colonna, 7
> 20149 Milano – Italia
> Tel.: +39.02.4343.121 - Fax: +39.02.4343.1230
> ema...@tr... - www.treuropa.com
>
>
> --
> This communication, that may contain confidential and/or legally privileged
> information, is intended solely for the use of the intended addressees.
> Opinions, conclusions and other information contained in this message, that
> do not relate to the official business of this firm, shall be considered as
> not given or endorsed by it. Every opinion or advice contained in this
> communication is subject to the terms and conditions provided by the
> agreement governing the engagement with such a client. If you have received
> this communication in error, please notify us immediately by responding to
> this email and then delete it from your system. Any use, disclosure, copying
> or distribution of the contents of this communication by a not-intended
> recipient or in violation of the purposes of this communication is strictly
> prohibited and may be unlawful.
> --
>

I get this error and would like to know what to do to eliminate it and
also what it means:
C:\Python25\lib\site-packages\matplotlib\axes.py:2571:
UserWarning: Attempting to set identical bottom==top results
in singular transformations; automatically expanding.
bottom=0, top=0 + 'bottom=%s, top=%s') % (bottom, top))
This is with Matplotlib 1.0.0.
Thank you,
Che

Hi,
Pau <vim...@go...>
> Hello,
> 
> I am trying to print in the plot the value of a time variable which I
> obtain like this
> 
> Time = MBH_inst[0] # Column 1
> 
> This should be placed on the top right part of the plot showing the current
> time
> 
> Time = XXX yrs
> 
> But I do not know how to pass this to ax.annotate:
> 
> ax.annotate('Time = ', size=18, xy=(3, 1), xycoords='data',
> xytext=(0.8, 0.95), textcoords='axes fraction',
> horizontalalignment='right', verticalalignment='top',
> )
Maybe like this:
ax.annotate('Time = %f'%(MBH_inst[0],), size=18, xy=(3, 1), xycoords='data',
 xytext=(0.8, 0.95), textcoords='axes fraction',
 horizontalalignment='right', verticalalignment='top',
 )
?
You can also adjust the number of shown digits right of the comma by setting 
it up like this: %0.2f etc.
Just look it up in the python documentation (search hints: python string 
format).
Wish you the best,
Malte

Hello,
I am using the scatter function and axes3D. I can define my viewpoint on
my data points using the elev and azim parameters. But I am looking for
more specification of the viewpoint : namely, I want to roll (i.e. rotate
around the view axis) and offset it (i.e. get sideways, not rotate around
my data points).
Is there any way to do it ? At the moment, I am using transformation
matrices applied to my data points to reproduce the roll and offset.
Ultimately, I want to rotate and offset both the data points and axis, but
the transformation matrices only impact the data point.
Hence my question : any way to roll and offset around a viewpoint with
Axes3D ? I don't want to do this interactively, I want to be able to
program it.
Thanks, and cheers !
Fréd