Re: [Matplotlib-users] problem with colorbar of contour

[Eric F. <ef...@ha...>]

Martinho MA wrote:
> Hello,
> I have a contour with a clim smaller than the limits of my data... and 
> because of this there is an error when I try to add a colorbar.
> Can someone help?
> Thanks
> MMA

I think the basic problem is that you are trying to use a colorbar as a 
legend in a case where it doesn't really makes sense; the colorbar is 
mapping a range of values to a range of colors, and you have values that 
are outside that range.  There are a couple ways to fix the problem:

1) Try using "colorbar(extend='both')".  This is a workaround, but it 
may do what you want.

2) Explicitly specify a list of contour levels that are within the range 
of your clim.  This is a better solution.

Eric

> 
> eg:
> 
> x=arange(20)
> y=arange(30)
> x,y=meshgrid(x,y)
> v=sqrt(x+y)  # max=6.928, min=0.0
> 
> # next is ok
> figure()
> contour(x,y,v)
> clim(0,7)
> colorbar()
> 
> # next gives the error: "ValueError: levels are outside colorbar range"
> figure()
> contour(x,y,v)
> clim(2,6)
> colorbar()
> 
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