6-58  ʹmeanƽֵ
>> A=magic(4)
A =
    16     2     3    13
     5    11    10     8
     9     7     6    12
     4    14    15     1
>> mean(A)
ans =
    8.5000    8.5000    8.5000    8.5000
>> mean(A,2)
ans =
    8.5000
    8.5000
    8.5000
    8.5000
>>
