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I heard today that Maxima can do the country plot by contour_plot in Sage. I tried the following unsuccessfully to import Maxima:
from Maxima import contour_plot I would like to make a similar map as here.
You probably mean a contour plot. Get a quick start and paste this code to your Sage Notobook:
f = lambda x,y: cos(x*y)
contour_plot(f, (-100, 4), (-4, 4))
More examples: