100 H2=1-p2 uu 001 010 A3=H242=0-3-3=R hH 221 由矩阵乘法可直接验证A=OR3 9; 2 =  2 u2 =            = − = − 0 1 0 0 0 1 1 0 0 3 1 1 2 2 H I uu T   4 - - R - - A H A =           = = 0 0 3 0 3 3 3 3 3 3 2 2           − − − − − − = = 2 2 1 2 1 2 1 2 2 3 1 Q H1 H2 由矩阵乘法可直接验证 A = QR