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How to use values of a vector as indices for a matrix
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I have the 20x20 matrix M and the m-by-3 matrix (two column vectors) L.
The values in the 1st and 2nd column of matrix L are to be used as the m and n indices for the matrix M. I attempt to get the corresponding values in M and insert them into column 3 as follows:
L(:,3)=M(L(:,2),L(:,1));
However, this does not work. What is wrong?
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