% -*- texinfo -*-
% @deftypefn {Function File} {} detrend (@var{x}, @var{p})
% If @var{x} is a vector, @code{detrend (@var{x}, @var{p})} removes the
% best fit of a polynomial of order @var{p} from the data @var{x}.
%
% If @var{x} is a matrix, @code{detrend (@var{x}, @var{p})} does the same
% for each column in @var{x}.
%
% The second argument is optional. If it is not specified, a value of 1
% is assumed. This corresponds to removing a linear trend.
% @end deftypefn