如A =[1 2 6;6 7 2] mean(A) = 3.5000 4.5000 4.0000 默认求各列的均值 mean(A,1) = mean(A) 默认对各列求平均值 mean(A,2) =[3 5]' 默认对各行求平均值 mean(A,3) 默认对应位置的行列求平均值 举例如下: