A workaround is to use unit_step instead of heaviside:
plot3d(unit_step(x-y),(x,-1,1),(y,-1,1))
The function heaviside is known to have issues as soon as some numerical
evaluation is required. Another example is:
numerical_integral(heaviside(x), -1, 1)
TypeError: unable to simplify to float approximation
numerical_integral(unit_step(x), -1, 1)
(1.0, 1.1102230246251565e-14)
Best wishes,
Eric.
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