1function o = onesidedhptrend(o, lambda, init) % --*-- Unitary tests --*--
2
3% Extracts the trend component from a dseries object using the one sided HP filter.
4%
5% INPUTS
6% - o         [dseries]   Original time series.
7% - lambda    [double]    scalar, trend smoothness parameter.
8%
9% OUTPUTS
10% - o         [dseries]   Trend component of the original time series.
11
12% Copyright (C) 2017 Dynare Team
13%
14% This file is part of Dynare.
15%
16% Dynare is free software: you can redistribute it and/or modify
17% it under the terms of the GNU General Public License as published by
18% the Free Software Foundation, either version 3 of the License, or
19% (at your option) any later version.
20%
21% Dynare is distributed in the hope that it will be useful,
22% but WITHOUT ANY WARRANTY; without even the implied warranty of
23% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24% GNU General Public License for more details.
25%
26% You should have received a copy of the GNU General Public License
27% along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
28
29if nargin>1
30    if lambda<=0
31        error(['dseries::onesidedhptrend: Lambda must be a positive integer!'])
32    end
33    if nargin>2
34        if ~isequal(init, 'hpfilter')
35            error('dseries::onesidedhpcycle: Unknown option!')
36        end
37    end
38else
39    lambda = [];
40end
41
42o = copy(o);
43if nargin<3
44    o.onesidedhptrend_(lambda);
45else
46    o.onesidedhptrend_(lambda, init);
47end
48
49return
50
51%@test:1
52d = randn(100,1);
53o = dseries(d);
54
55try
56    p = o.onesidedhptrend();
57    t(1) = 1;
58catch
59    t(1) = 0;
60end
61
62if t(1)
63    t(2) = dassert(o.data,d);
64end
65
66T = all(t);
67%@eof:1