To Zero elements in a Column

• To zero elements from k+2 to n

• x = the column from k+1 to n

• v = x + sign(x1) ||x||2

• P = I - 2 v vT/vT v

• Q = diag(Ik,Pn-k)

• B = QBQ

• Need not compute P;B can be updated using v

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