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Union of two matrices with different column size

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I need to make the union between two matrices:
M 455799x3
N 771719x3
I attach the workspace with the two matrices inside. What I have to do is to insert the values that are in the 3rd column of M in the 3rd column of N. The first 2 columns of both the matrix represent X coord and Y coord but the problem is that the coordinates of the matrices are not in the same order.

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Stephen23
Stephen23 il 15 Dic 2017
Modificato: Stephen23 il 15 Dic 2017
>> [idm,idn] = ismember(M(:,1:2),N(:,1:2),'rows');
>> N(idn,3) = M(idm,3);
Note that the provided data are floating point, so you should definitely read this:

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