How to draw a line on a symbolic surface

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Rowan Humphreys
Rowan Humphreys 2021-11-18
评论： Rowan Humphreys 2021-11-18
Ran in:
I would really like a line running along the surface below at all points where f1=0. kind of like a contour line in 3d.
syms x1 x2
f1 = x1^2+x2^3-9
f1 = 
fsurf(f1);

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John D'Errico
John D'Errico 2021-11-18
编辑：John D'Errico 2021-11-18
Ran in:
syms x1 x2
f1 = x1^2+x2^3-9
f1 = 
fsurf(f1);
hold on
fimplicit(f1,'r')
WTP? :)

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