817-2 Nodal analysis k The node-to-datum voltage vector. bk The branch voltage vector: 十 bk b10b2 bB D-D=A D Ai1=0 b i一i∴.Ai1=Ai-AL.=0 b Ai=Ai§17-2 Nodal analysis The node-to-datum voltage vector: T n n n nN [ ]  =  1  2  • The branch voltage vector: T b b b bB [ ]  =  1  2  • • • • b = e − s • • • = n T  b A  • • • •  − = n T e  s A  • • •  Ai b = 0 • • • b = e − s i i i • • • • • • •  Ai b = Ai e − Ai s = 0 • • • • e = s Ai Ai bk i ek i sk i +ek − + bk −  sk Zek