Generating a matrix with specific sums
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I am trying to generate a matrix based on specific sums. Let's say I generate the following matrix
X = randi([0 400], 6, 6);
Which gives me the matrix X. Now I want to sum x11 and x21, x12 and x22, x21 and x22, and so on. This should give me a 3x6 matrix. Does anyone have any clue how to do this effectively?