6-69  ׼⡣
>> X=[7 2 3;2 -5 6;8 3 1]
X =
     7     2     3
     2    -5     6
     8     3     1
>> std(X)
ans =
    3.2146    4.3589    2.5166
>> std(X,0,1)
ans =
    3.2146    4.3589    2.5166
>> STD(X,1)
ans =
    2.6247    3.5590    2.0548
>> STD(X,1,2)
ans =
    2.1602
    4.5461
    2.9439
>>
