The return value z has the same type as x. If x is a vector, z is a scalar equal to the maximum element of x. Otherwise, it is a row vector with the same column dimension as x and with j-th element equal to the maximum element in the j-th column of x.
The return value index is an integer vector with the same dimension as z. If x is a vector, index is the index in x of its maximum element. Otherwise, the j-th element of index is the row index of the maximum element in the j-th column of x
is the element-by-element maximum of the elements of x and y.
O-Matrix will respond
max( [1, 2 , 3] )