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C++ API

: 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 p is optional. If it is not specified, a value of 1 is assumed. This corresponds to removing a linear trend.

The order of the polynomial can also be given as a string, in which case p must be either "constant" (corresponds to p=0) or "linear" (corresponds to p=1).

See also: polyfit.

Package: octave