matplotlib-users Mailing List for matplotlib

Hello,

I'm trying to plot a simple list of x/y coords over an image (.png). I can
show the image, or plot the data, but cannot find a way to layer one over
the other. I would greatly appreciate someone pointing me in the right
direction. Thanks.

Mark,

  As a quick workaround, try

rcParams['contour.negative_linestyle']=(6, 0)

This is a hack--using dashes with zero-length spaces.

I expect to have a better solution in svn shortly.

Eric


Mark Bakker wrote:
> Hello -
> 
> I tried to turn of the feature that makes contours with negative values 
> dashed.
> According to the mailinglist this should go by setting: 
> rcParams['contour.negative_linestyle']=('None','None')
> I tried any combination of the None, None syntax, or just 'solid', but 
> nothing worked.
> Example shown below. I am using 0.90.1.
> Thanks, Mark
> 
> from pylab import *
> x,y = meshgrid(linspace(-3,3,10),linspace(-3,3,10))
> rcParams['contour.negative_linestyle']=('None','None')
> contour(x,y,x,colors='b')
> 
> Error message:
> 
> Traceback (most recent call last):
>   File "<pyshell#10>", line 1, in ?
>     contour(x,y,x,colors='b')
>   File "C:\Python24\Lib\site-packages\matplotlib\pylab.py", line 1777, 
> in contour
>     draw_if_interactive()
>   File 
> "C:\Python24\Lib\site-packages\matplotlib\backends\backend_tkagg.py", 
> line 59, in draw_if_interactive
>     figManager.show()
>   File 
> "C:\Python24\Lib\site-packages\matplotlib\backends\backend_tkagg.py", 
> line 311, in show
>     self.canvas.draw()
>   File 
> "C:\Python24\Lib\site-packages\matplotlib\backends\backend_tkagg.py", 
> line 154, in draw
>     FigureCanvasAgg.draw(self)
>   File 
> "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py", line 
> 392, in draw
>     self.figure.draw(renderer)
>   File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 601, 
> in draw
>     for a in self.axes: a.draw(renderer)
>   File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 1286, in 
> draw
>     a.draw(renderer)
>   File "C:\Python24\Lib\site-packages\matplotlib\collections.py", line 
> 700, in draw
>     transoffset)
> ValueError: invalid literal for float(): None
> 
> 
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Hi all,
First, sorry for the crossposting. I have drafted a small document (it
is in Spanish, if there's interest, I'll have a go at translating it)
on how to use OGR from Python access geospatial data, which can be
further analysed or plotted with matplotlib. It is a very brief
introduction, and surely there is much to improve, but I was looking
for something like this for a while, and couldn't find it.

The page is here: <http://jgomezdans.googlepages.com/ogr%2Cpythonymatplotlib>

Cheers,
jose

Hello -

I tried to turn of the feature that makes contours with negative values
dashed.
According to the mailinglist this should go by setting: rcParams['
contour.negative_linestyle']=('None','None')
I tried any combination of the None, None syntax, or just 'solid', but
nothing worked.
Example shown below. I am using 0.90.1.
Thanks, Mark

from pylab import *
x,y = meshgrid(linspace(-3,3,10),linspace(-3,3,10))
rcParams['contour.negative_linestyle']=('None','None')
contour(x,y,x,colors='b')

Error message:

Traceback (most recent call last):
  File "<pyshell#10>", line 1, in ?
    contour(x,y,x,colors='b')
  File "C:\Python24\Lib\site-packages\matplotlib\pylab.py", line 1777, in
contour
    draw_if_interactive()
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_tkagg.py",
line 59, in draw_if_interactive
    figManager.show()
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_tkagg.py",
line 311, in show
    self.canvas.draw()
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_tkagg.py",
line 154, in draw
    FigureCanvasAgg.draw(self)
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 392, in draw
    self.figure.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 601, in
draw
    for a in self.axes: a.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 1286, in
draw
    a.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\collections.py", line 700,
in draw
    transoffset)
ValueError: invalid literal for float(): None

Hi,

I want to plot some timeseries (eg. stockcharts). I use now  
DateLocator/Formatter, it works fine for me with the exeption, that  
dataless periods on X-Axis (eg. weekends) are also plotted. Is there an  
easy way to suppress them?

regards