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

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.

Answer 1

[KALYAN ACHARJYA]

Matlab: (Uses divide by N-1)

>> A=[1 4 2];
>> std(A)
ans =
    1.5275

Answer 2

[Steven Lord]

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)