Finding an index from a 3D matrix
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Alonso Figueroa
le 20 Avr 2023
Modifié(e) : Dyuman Joshi
le 20 Avr 2023
Hello,
I am writing to ask for help in finding the index of a point in a 3D array. I have a 3D matrix of dimentions [M,N,O] and I have reshaped it onto a 1xQ array (Q = M*N*O)
I'm trying to find the index in array Q of a point selected three dimensionally in the MNO matrix. This could easily be performed in 2D ith the 'sub2ind()' function, but I havent been able to do this in 3D.
I would apreciate any help.
Best,
Alonso
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Dyuman Joshi
le 20 Avr 2023
Modifié(e) : Dyuman Joshi
le 20 Avr 2023
sub2ind works for 3D arrays as well
%Initial array, with random values for example
in = reshape(1:105,3,5,7);
%Array reshaped into a row vector
out = reshape(in,1,[]);
%Random point in the 3D array
ix = randi(3)
iy = randi(5)
iz = randi(7)
linearindex = sub2ind(size(in), ix, iy, iz)
%Verifying the answer as our data is simply 1:numel(in)
in(ix, iy, iz)
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