How to set Assumptions for function handle?

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easy case:
I'v gut a function handle:
f = @(x,y,z)x.^2+y.^2+z.^2-1;
fimplicit3(f)
for plotting an implicit function. Now I also want to assume z > 0
What's the deal?

Accepted Answer

Stephan
Stephan on 19 May 2021
See fimplicit3 example here and use interval argument:
f = @(x,y,z)x.^2+y.^2+z.^2-1;
fimplicit3(f, [-1, 1, -1, 1, 0, 1])

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