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zd=dtrend(z,o,brp)
DTREND Removes trends from data sets. ZD = DTREND(Z) or ZD = DTREND(Z,O,BREAKPOINTS) Z is the data set to be detrended, organized with the data records as column vectors. ZD is returned as the detrended data. If O = 0 (the default case) the sample means are removed from each of the columns. If O = 1, linear trends are removed. A continuous, piecewise linear trend is adjusted to each of the data records, and then removed. The interior breakpoints for the linear trend segments are contained in the row vector BREAKPOINTS. The default value is that there are no interior breakpoints, so that one single straight line is removed from each of the data records. This function is obsolete. Please use DETREND instead. See also DETREND, IDFILT.
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function zd=dtrend(z,o,brp) % L. Ljung 7-8-87 % Copyright (c) 1986-98 by The MathWorks, Inc. % $Revision: 2.4 $ $Date: 1998/03/25 22:50:12 $ if nargin < 2, o = 0; end % Default is mean removal, unlike DETREND if nargin < 3 zd = detrend(z,o); else zd = detrend(z,o,brp); end