create datatip on a surface

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reza aghaee
reza aghaee 2020-7-8
评论： reza aghaee 2021-1-30
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

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Takashi Matsubara
Takashi Matsubara 2021-1-22
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);

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