Uwe Schmitt wrote:
> Hi,
>
> I would like to plot contours with a nonlinear mapping from values to
> color as follows:
>
> -1 -> red
> 0 -> white or green or black
> +1 -> red
>
> How can I achieve this ?
See examples/contourf_demo.py. The relevant part is this:
# Now make a contour plot with the levels specified,
# and with the colormap generated automatically from a list
# of colors.
levels = [-2, -1.5, -1, -0.5, 0, 0.5, 1, 1.5]
CS3 = contourf(X, Y, Z, levels,
colors = ('r', 'g', 'b'),
origin=origin)
Try specifying 4 levels; I think this would do what you want (with black
for the middle range, for example):
levels = [-1.5, -0.5, 0.5, 1.5]
CS = contourf(X, Y, Z, levels, colors=('r', 'k', 'r'))
Eric
>
> Greetings, Uwe
>
>
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