matlab中实现矩阵删除一行或一列的方法

>> A=[1,2,3;4,5,6;7,8,9]A =  1  2  3  4  5  6  7  8  9

>> A(2,:)=[]A =  1  2  3  7  8  9

>> A(:,2)=[]A =  1  3  7  9