Understanding standard deviation code

Hi Guys,

For the following built in matlab function for standard deviaion std(X,0,2) please can someone tell me what the 0 and 2 are for?

Thanks in advace

Answer 1

[the cyclist]

As explained clearly in the documentation for std:

The "0" specifies that the standard deviation will be weighted by sqrt(N-1), where N is the number of elements.

The "2" specifies that the standard deviation will be taken in dimension 2 (i.e. across the rows of a matrix, rather than the default which is down the columns).