# Probing a plot based on colormap information

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Pelajar UM on 10 Mar 2022
Commented: Pelajar UM on 11 Mar 2022
How can I probe a plot with colormap data?
As you see, in this case, it only shows the xyz coordinates which is not really useful. I want to be able to see the colormap value (between 0 and 1).
Any ideas? I am using the trisurf function.

Simon Chan on 11 Mar 2022
Try function datatip & dataTipTextRow if your MATLAB version is after 2019b.
[x,y] = meshgrid(1:15,1:15);
z = peaks(15);
T = delaunay(x,y);
s = trisurf(T,x,y,z);
dt = datatip(s);
s.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow('Colormap Value',T,'%.1f');
Pelajar UM on 11 Mar 2022
Looks great now. Thank you again!

KSSV on 10 Mar 2022
I don't think you would be able to see the values like that. But you can see what value it has using:
F = scatteredInterpolant(x,y,z,c) ;
ci = F(xi,yi,zi) ; % where xi, yi, zi is the picked point
Pelajar UM on 10 Mar 2022
Thanks, but how do you get the figure object of an UIAxes in app designer?
trisurf(F,P(:,1),P(:,2),P(:,3), flow12, 'Parent', app.UIAxes2_10);
c = colorbar(app.UIAxes2_10);
caxis(app.UIAxes2_10,[0.333 1]);
colormap(app.UIAxes2_10, jet);
c.Label.String = 'T11 Tensor';
On another note, there seems to be a way to modify the data tip function, but I don't really know how to implement customized functions in app designer: