A(:,6)=222 A = 1 4 7 0 0 222 2 5 8 0 0 222 3 6 9 0 0 222 0 0 0 0 0 222 0 0 0 0 111 222 (2)多次寻访扩展法 AA=A(:,[1:6,1:6]) AA = 1 4 7 0 0 222 1 4 7 0 0 222 |