create datatip on a surface

a = 0 : 0.1 : 1;
b = 0 : 0.1 : 1;
[bb,aa] = meshgrid(b,a);
Acc = aa.^2 - bb.^2;
ss = surf(aa,bb,Acc);
c = a(2)^2 - b(4).^2;
datatip(ss,a(2),b(4),c);

Hi,

why this part of my code does not work correctly?

I want to create datatip on 0.1,0.3,-0.08 but it create on 0,0,0

Answer 1

[Takashi Matsubara]

I have the same problem.

In surf or mesh, datatip with coordinate x,y,z may not work correctly.

datatip with 'DataIndex' may work correctly.

For DataIndex, sub2ind can be used.

In this case, below code may work correctly.

a = 0 : 0.1 : 1;
b = 0 : 0.1 : 1;
[bb,aa] = meshgrid(b,a);
Acc = aa.^2 - bb.^2;
ss = surf(aa,bb,Acc);
c = a(2)^2 - b(4).^2;
id=sub2ind(size(Acc),2,4);
datatip(ss,'DataIndex',id);

[reza aghaee]

Thank you so much