試題詳解

八、 Consider a 3 x 3 nonzero matrix A, and let W = . The least
squares solutions xLs to Ax = b are illustrated in the following figure，where projwe b is the
orthogonal projection of vector b onto vector space W. A minimun length least squares
, solution EMurs is the one among the least squares solutions that has a minimum norm.

Which of the following stateme ents is/are true?
(A)
(B)
(C)
(D) The minimum length least squares solution EMLLS to Ax = b is unique, and =
projvxLs, where V = .

(E) None of the above are true.