Running On matrix by diagonals

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编辑： Guillaume 2018-7-8

I am looking for an algorithm that can collect the elements of a matrix in the following way

It can be a non square matrix too

So the answer would be [a41,a42,a31,a43,a32,a21,a44,...]

Guillaume 2018-7-8

编辑：Guillaume 2018-7-8

One option:

[rows, cols] = size(A);
indices = (1:cols+rows)*rows - (0:rows-1)'*(rows+1);
indices = indices(indices > 0 & indices <= numel(A));
A(indices)

Require R2016b or later for the implicit expansion of the subtraction

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