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Unformatted text preview: A x = b . EXAMPLE. Find a least-squares solution of A x = b when A = 1-2-1 2 3 2 5 and b = 3 1-4 2 . Now nd the least-squares error associated with this least-squares solution. This is the distance from b to A x . FACT. If A has linearly independent columns and A = QR is a QR factorization of A , then A x = b has a unique least-squares solution given by x = R-1 Q T b . HOMEWORK: SECTION 6.5...
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