How do I do this?

Plot region bounded above by the paraboloid z = x2 + y2 and below by the triangle enclosed by the lines y = x, x=0, and x + y =2,

[Walter Roberson]

Symbolic toolbox and piecewise() and fsurf()

[JIANGWEN DONG]

Can you tell me how do write the code, please?

[x,y] = meshgrid(linspace(-2,2));
z = x.^2+y.^2;
mesh(x,y,z)
hold on;

I only work this out.

[Walter Roberson]

[x,y] = meshgrid(linspace(-2,2));
z = x.^2+y.^2;
z(x + y > 2) = nan;
mesh(x,y,z)

Except you would insert more statements setting selected z locations to nan.

[JIANGWEN DONG]

oh thank you very much!

What about the other two lines?

[Walter Roberson]

you would insert more statements similar to

z(x + y > 2) = nan;

[JIANGWEN DONG]

OK

thank you very much!