>> and I am getting this error:
>>
>> TypeError: You must first set_array for mappable
>>
>> Can anyone provide guidance on how you overlay quiver plots on top of
>> contours?
>
>
> This list is for newcomers to Python and its standard
> library. This looks like a fairly specific SciPy/Numpy,
> and especially matplotlib type question.
>
> You would probably be better off asking on the SciPy
> forums/lists.
Agree with Alan. You'll get better help from people who know the
library. Very few of us here do things with SciPy.
Just to add: please add more context to your error message reports,
regardless of who you're asking help from.
To include the single line:
#######
TypeError: You must first set_array for mappable
#######
is somewhat helpful: it does have some information.
But unless you've suppressed error reporting, you should be getting
significantly more information from the error message.
I did a quick web search for your error message, and came up with:
http://stackoverflow.com/questions/6600579/colorbar-for-matplotlib-plot-surface-command
which might look reasonably close to what you're seeing. And note
how, in that message, they include a full stack trace of the problem,
which looks like:
#########################################################################
Traceback (most recent call last):
File "<ipython console>", line 1, in <module>
File
"C:\Python26\lib\site-packages\spyderlib\widgets\externalshell\startup.py",
line 122, in runfile
execfile(filename, glbs)
File "C:\Documents and Settings\mramacha\My
Documents\Python\Candela\test.py", line 22, in <module>
fig.colorbar(surf, shrink=0.5, aspect=5)
File "C:\Python26\lib\site-packages\matplotlib\figure.py", line
1104, in colorbar
cb = cbar.Colorbar(cax, mappable, **kw)
File "C:\Python26\lib\site-packages\matplotlib\colorbar.py", line
706, in __init__
mappable.autoscale_None() # Ensure mappable.norm.vmin, vmax
File "C:\Python26\lib\site-packages\matplotlib\cm.py", line 261, in
autoscale_None
raise TypeError('You must first set_array for mappable')
TypeError: You must first set_array for mappable
#########################################################################
This is the sort of thing that is a *joy* to see when debugging. If I
don't have a good stack trace when trying to diagnose a problem, I am
not as happy, because I don't have my hand on any useful context to
work with. It's like working in the dark.
In your case, I can't tell for sure if your scenario matches the
above, because the error message information content is low enough to
raise doubts.
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