Function Reference
— Function File: detrend (x, p)

If x is a vector, detrend (x, p) removes the best fit of a polynomial of order p from the data x.

If x is a matrix, detrend (x, p) does the same for each column in x.

The second argument is optional. If it is not specified, a value of 1 is assumed. This corresponds to removing a linear trend.