matplotlib-users Mailing List for matplotlib

I'm having two (presumably) unrelated problems with contourf

1) One of my datasets seems to trigger a bug:

Specifically when I run the appended script
(http://clouds.eos.ubc.ca/~phil/matplotlib_error/arrayplot.py)
using the pickled array:
(http://clouds.eos.ubc.ca/~phil/matplotlib_error/array.pic)
I get:
http://clouds.eos.ubc.ca/~phil/matplotlib_error/surfaceOnTop.png

but if I try to flip the pressure axis by uncommenting:

axes1.set_ylim([1000,250])

the rightside-up plot is corrupted

http://clouds.eos.ubc.ca/~phil/matplotlib_error/surfaceOnBottom.png

2) It looks like the alpha=0.25 setting for the normalized set_under/over
colormap works for the colorbar (the little triangles are transparent)
but not for the actually filled contours (the under values are
saturated black/salmon)

All of this is with the current matplotlib svn snapshot (revision 4986).
Both the top and bottom runs give the same --verbose-helpful output:

~/public_html/matplotlib_error phil@owl% python  arrayplot.py 
--verbose-helpful
$HOME=/home/phil
CONFIGDIR=/home/phil/.matplotlib
matplotlib data path 
/home/phil/usr251_Centos/lib/python2.5/site-packages/matplotlib/mpl-data
loaded rc file /home/phil/.matplotlib/matplotlibrc
matplotlib version 0.98pre
verbose.level helpful
interactive is False
units is False
platform is linux2
numerix numpy 1.0.5.dev4731
Using fontManager instance from /home/phil/.matplotlib/fontManager.cache
backend Agg version v2.2
Warning: invalid value encountered in reduce
Warning: invalid value encountered in reduce

thanks in advance for any suggestions -- Phil



#--------------------
import numpy as N
import matplotlib as mpl
import pickle
mpl.use('Agg')
from pylab import figure, show, close,setp,savefig


fig1=figure(1)
fig1.clf()
axloc = [.1, .1, .67, .8]
colorbarloc = [.82, .1, .025, .8]
axes1 = fig1.add_axes(axloc)
colorbaraxes = fig1.add_axes(colorbarloc)
vmin, vmax = (-40, 20)
norm = mpl.colors.normalize(vmin = vmin, vmax = vmax)
cmap = mpl.cm.jet
cmap.set_over('black', 0.25)
cmap.set_under('salmon', 0.25)
picFile=open('array.pic','r')
plotArray=pickle.load(picFile)
picFile.close()
timeMarks=N.arange(0,9)
presslevs=N.arange(1000,200,-10)
contplot = 
axes1.contourf(timeMarks,presslevs,plotArray,N.linspace(vmin,vmax,7),
                          norm=norm,
                          extend='both',
                          cmap=cmap)
#axes1.set_ylim([1000,250])
fig1.colorbar(contplot,colorbaraxes)
labelHandle=colorbaraxes.set_ylabel('temperature (deg C)')
setp(labelHandle,'rotation',-90,'ha','left')
axes1.set_xticks(timeMarks[[0,4,8]])
axes1.set_ylabel('pressure (hPa)')
axes1.set_xlabel('Date')
axes1.set_title('LXK balloon sondes')
#savefig('surfaceOnBottom')
savefig('surfaceOnTop')


    
    

    
    
    
    
    
    
    

    Hi,

I've got difficulties to make a local installation of matplotlib.
I think it's due to my nonstandard installation of python and tk, which both
are in my home.

I've seen on the website that , for non standard installation, I should
complete the basedir dictionary defined in the setupext.py script.

But for the Tcl/Tk header files, this does not seems to work. Whatever I put
in this dictionary, the module.include_dirs corresponding to Tk (line 825 of
setupext.py) is always  equal to  ['/usr/share/include',
'/usr/share/include'].

Did I miss something obvious ?

I'm on a linux2 platform and I''m trying make a local installation of
python2.5 + matplotlib 0.91.2 in my home.

Regards,
-- 
LB

On Saturday 23 February 2008 10:49:25 am John Hunter wrote:
> On Fri, Feb 22, 2008 at 11:04 PM, sa6113 <s.p...@gm...> wrote:
> >  I could return the output object of the plot as image file , would you
> > please tell me how I have to convert image to QImage in order to use it
> > in my GUI ?
>
> I could, but this is a very poor way to do it.  First, you would not
> be able to interact with your figure (pan, zoom, etc).  2nd, you would
> be using qimage to rescale your plot with the embedded window size an
> this would be far inferior to having matplotlib draw into the
> requested size.  The right way to use this is to follow the example of
> http://matplotlib.sourceforge.net/examples/embedding_in_qt4.py

Yes, please follow the example John pointed out. The qt4agg backend already 
provides a widget that you can embed in your program, an example is in 
embedding_in_qt4.py, it does the conversion to a QImage already, you dont 
need to reimplement it.

On Fri, Feb 22, 2008 at 11:04 PM, sa6113 <s.p...@gm...> wrote:
>
>  I could return the output object of the plot as image file , would you please
>  tell me how I have to convert image to QImage in order to use it in my GUI ?

I could, but this is a very poor way to do it.  First, you would not
be able to interact with your figure (pan, zoom, etc).  2nd, you would
be using qimage to rescale your plot with the embedded window size an
this would be far inferior to having matplotlib draw into the
requested size.  The right way to use this is to follow the example of
http://matplotlib.sourceforge.net/examples/embedding_in_qt4.py

JDH

Erik Tollerud wrote:
> I use the scatter(x,y) command to make scatter plots, but I noticed
> today (on the SVN version of mpl) that when I call legend() after
> giving scatter(x,y,label='somelabel') , the legend doesn't show the
> marker symbols  - it only has a square patch colored in the color that
> was used for the scatter plot.  Is this a bug, or intended behavior?
> (and is there a work-around to show the marker symbols in the legend?)

Hi Erik,

I would say it's neither a bug nor an intended bahavior. It's just not 
implemented -- so you might call it a misbehaviour ;-)

I too hope that this will be fixed/added, since it's an issue open some 
time now (I guess since scatter was implemented !?)

Manuel

Hello List,

I am using python-matplotlib version 0.87.7-0.3ubuntu1(feisty) and
having some problems with a script that uses it. I get this import error
and am not sure how to debug it further, any assistance would be greatly
appreciated.

Best regards, 

Paul marsh

---------------------------------------------------------------------

crank examples # pwd
/home/a_downloads/basemap-0.9.9.1/examples
crank examples # python simpletest.py
Traceback (most recent call last):
  File "simpletest.py", line 1, in <module>
    from matplotlib.toolkits.basemap import Basemap
  File
"/usr/lib/python2.5/site-packages/matplotlib/toolkits/basemap/__init__.py", line 1, in <module>
    from basemap import __doc__, __version__
  File
"/usr/lib/python2.5/site-packages/matplotlib/toolkits/basemap/basemap.py", line 20, in <module>
    from matplotlib.cbook import is_scalar, dedent
ImportError: cannot import name dedent
crank examples # python -c "from matplotlib.toolkits.basemap import
basemap_datadir;" 
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File
"/usr/lib/python2.5/site-packages/matplotlib/toolkits/basemap/__init__.py", line 1, in <module>
    from basemap import __doc__, __version__
  File
"/usr/lib/python2.5/site-packages/matplotlib/toolkits/basemap/basemap.py", line 20, in <module>
    from matplotlib.cbook import is_scalar, dedent
ImportError: cannot import name dedent
crank examples # 

---------------------------------------------------------------------

I could return the output object of the plot as image file , would you please
tell me how I have to convert image to QImage in order to use it in my GUI ?


sa6113 wrote:
> 
> How can I show my plot figure in the specific location or part of an
> application , I am using pylab.
> 

-- 
View this message in context: http://www.nabble.com/Showing-the-plot-in-the-specific-location-tp15545079p15648399.html
Sent from the matplotlib - users mailing list archive at Nabble.com.

I use the scatter(x,y) command to make scatter plots, but I noticed
today (on the SVN version of mpl) that when I call legend() after
giving scatter(x,y,label='somelabel') , the legend doesn't show the
marker symbols  - it only has a square patch colored in the color that
was used for the scatter plot.  Is this a bug, or intended behavior?
(and is there a work-around to show the marker symbols in the legend?)