Simple Question: How to graph certain surfaces depending on the Z value?

Hi guys,

I'm trying to graph only Test1 for Z2 > 5, and wanting to graph only Test2 for Z2 < 5.

x = [0:5];
y = [0:5];

Test1 = @(x,y)(x+y);
Test2 = @(x,y)(2.*x+y);
[X1,Y1] = meshgrid(x,y);
Z1 = Test1(X1,Y1);
Z2 = Test2(X1,Y1);

%  s1 = surf(X1,Y1,Z1);
%  s2 = surf(X1,Y1,Z2);

Answer 1

[pfb]

You could set the points that do not meet your constraint to NaN;

 i = Z1<5;
 Z1(i)=NaN;

 i = Z2>5;
 Z2(i)=NaN;

The result is a bit jagged with your small grid, though.

[A]

Perfect. Thanks. I used your suggestion to modify the code and here is the working result. No worries about the jaggedness because this is just a test:

x = [0:5];
y = [0:5];

Test1 = @(x,y)(x+y);
Test2 = @(x,y)(2.*x+y);
[X1,Y1] = meshgrid(x,y);
Z1 = Test1(X1,Y1);
Z2 = Test2(X1,Y1);

i = Z1<5;
Z1(i)=NaN;
s1 = surf(X1,Y1,Z1);
hold on
i = Z2>5;
Z2(i)=NaN;
s2 = surf(X1,Y1,Z2);