(y)=std(x, dim)
x Any real numeric array.
dim A positive integer not greater than the number of dimensions of x .
y The array of standard deviations of the elements of x along the dimension dim whose default value is 1 .

If x is a vector, the output is the standard deviation of all the elements of the vector. Otherwise the output is of the same size as the input except that along the dimension dim the size of the output is 1 . The element y[i,j,k,...1, p, q,..] (with 1 corresponding to the dimension dim ) of the output is the standard deviation of the elements of the vector x[i,j,k,....,:,p,q,...] where i, j, k, ...,p,q,... are scalar integers ranging through the size of the input along the corresponding dimension.