Which version of matplotlib are you using? Also, do you have an example
dataset and a simple, selfcontained example to demonstrate this?
Chances are, there are NaNs occurring in the calculation, but since we have
code elsewhere that handles NaNs properly, it probably isn't impacting your
graph. However, it *might* be a sign that there is something
wrong/unexpected with your input data (or maybe even the contour levels
themselves).
Cheers!
Ben Root
On Tue, Jun 17, 2014 at 6:45 AM, <keith.briggs@...> wrote:
> Using pyplot.contour, I'm getting
>
> /usr/lib/pymodules/python2.7/matplotlib/contour.py:374: RuntimeWarning:
> invalid value encountered in true_divide
> dist = np.add.reduce(([(abs(s)[i]/L[i]) for i in range(xsize)]),1)
>
> although the resulting plot seems to be ok.
>
> Keith
>
>
>
>
> 
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