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could anyone help me how to verify the standard deviation of matrix

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jaah navi
jaah navi 2019-9-25
关闭： MATLAB Answer Bot 2021-8-20
A=[1 4 2]
when i used the command std(A) i am getting the result to be 1 5275.
But when i calculate manually i am getting different answer.could anyone please help me how to manually calculate standard deviation.

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回答（2 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2019-9-25
编辑：KALYAN ACHARJYA 2019-9-25
Matlab: (Uses divide by N-1)
>> A=[1 4 2];
>> std(A)
ans =
1.5275
std.png
Steven Lord
Steven Lord 2019-9-25
To normalize by the number of observations minus 1 (the default behavior) call std with 1 input or with a second input of 0.
To normalize by the number of observations specify the second input to std (named w in the documentation) as 1.
A = [1 4 2];
normalizeByNminus1 = std(A)
normalizeByN = std(A, 1)

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