Question: We have n data points r(),...,n) e Rd and we store them in a matrix X, one point per row. (a) What is the

We have n data points r(),...,n) e Rd and we store them

We have n data points r(),...,n) e Rd and we store them in a matrix X, one point per row. (a) What is the dimension of X? (b) What is the dimension of XXT? (c) What is the (i, j) entry of XXT, simply?

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