Question: | Given a matrix A write a python function which returns a) B = ATA, b) the sum of the squares of the coefficients of

| Given a matrix A write a python function which returns

| Given a matrix A write a python function which returns a) B = ATA, b) the sum of the squares of the coefficients of A, and c) the row vector of column means (hints: use the mat class to define A. Type help(A) to find out available attributes for A (e.g., A.size)). Test your routine(s) on A=13 4

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