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A=[31,4; 0.01,0.03];
B=sort(A,2)

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A=[31,4; 0.01,0.03];
A2=sort(A,2);
A3=sort(A,2,'descend');
[A2(1,:); A3(2,:)]

CODE:
ans =
    4.0000   31.0000
    0.0300    0.0100

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