So I'm trying to get around the fact that plotting half of an
ellipsoid with plot3d is nigh impossible,
x,y=var('x,y')
plot3d(sqrt(1-(x^2/9+y^2/4)),(x,-3,3),(y,-2,2))
but I stumbled across this problem in the process. Since the problem
is that we can't evaluate at some points lets replace them. So trying
this
sqrt(max(1-(x^2/9+y^2/4),0))
returns this
sqrt(-1/9*x^2 - 1/4*y^2 + 1)
So passing this into plot3d doesn't fix anything.
Is it possible to have max behave as you would expect with a symbolic
expression, i.e. wait until you evaluate it or restrict the domain to
check what is the maximum of the two or more values.
Thanks,
Matt
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