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Question: where represents the transpose of the matrix an...

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, where represents the transpose of the matrix, an n × m matrix of full rank (a) What is HX in terms of Xs? Simplify as much as possible. (b) What are the dimensions of the matrix H if X is a 4 × 2 matrix? (c) What are the dimensions of the matrix H if X is an n × m matrix? (d) Find trace(H). Hint: Trace has a special property involving cyclic permutations.

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