How to best construct a matrix whose elements are exactly their indices or functions of the indices in Matlab?

Question

What is the best way to construct a matrix whose elements are exactly their indices in Matlab?

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EDIT: The existing answers to this question is applicable to how

Answer 1

Another option using repmat (since the content of these matrices is redundant):

X=repmat((1:size(YourMatrix, 2))', 1, size(YourMatrix, 1));
Y=repmat(1:size(YourMatrix, 1), size(YourMatrix, 2), 1);