How to find the local maxima/minima for 3D surf plot with the location of x and y coordinates?

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Daniyar Saparov
Daniyar Saparov 2018-1-29
评论： Scout Patel 2022-8-15
Hello. I have a 3D surf plot of an eigenvalue, that depends on both x and y. I wanted to find the values of the local minima/maxima near some specific coordinates, as well as the coordinates themselves at those points. Is it possible to do so? I used to do this in mathematica, but don't know how to do it in matlab. Thanks!
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Scout Patel
Scout Patel 2022-8-15
If you don't have the Image Processing Toolbox:
[TF1,P] = islocalmax(Array,2,'MinProminence',4);%threshold at 4...change accordingly
P(TF1)
V1 = find(TF1, 3, 'first') % this finds the first 3...change accordingly
[y1,x1]=ind2sub(size(Array),V1)

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Arun Mathamkode
Arun Mathamkode 2018-2-1
You can use the imregionalmax function from the Image Processing Toolbox. The following answer will be useful to you. https://www.mathworks.com/matlabcentral/answers/277512-how-to-find-peaks-in-3d-mesh
imregionalmax returns a matrix with ones at the coordinates where there is local maxima present and zeros at all other locations. If you want to find the local maxima near a coordinate, you can select a suitable neighborhood and search for ones in that region.

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