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% STK_SAMPLING_VDC_RR2 generates points from the "RR2" van der Corput sequence
%
% CALL: X = __stk_sampling_vdc_rr2__(N, J)
%
% computes the first N terms of the j^th RR2-scrambled van der Corput
% sequence.
%
% REFERENCE
%
% Ladislav Kocis and William J. Whiten, "Computational investigations of low
% discrepancy sequences", ACM Transactions on Mathematical Software,
% 23(2):266-294, 1997.
% http://dx.doi.org/10.1145/264029.264064
%
% SEE ALSO: stk_sampling_halton_rr2
% Copyright Notice
%
% Copyright (C) 2013 Alexandra Krauth, Elham Rahali & SUPELEC
%
% Authors: Julien Bect <julien.bect@centralesupelec.fr>
% Alexandra Krauth <alexandrakrauth@gmail.com>
% Elham Rahali <elham.rahali@gmail.com>
% Copying Permission Statement
%
% This file is part of
%
% STK: a Small (Matlab/Octave) Toolbox for Kriging
% (http://sourceforge.net/projects/kriging)
%
% STK is free software: you can redistribute it and/or modify it under
% the terms of the GNU General Public License as published by the Free
% Software Foundation, either version 3 of the License, or (at your
% option) any later version.
%
% STK is distributed in the hope that it will be useful, but WITHOUT
% ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
% or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
% License for more details.
%
% You should have received a copy of the GNU General Public License
% along with STK. If not, see <http://www.gnu.org/licenses/>.
%!error __stk_sampling_vdc_rr2__() % two inputs required
%!error __stk_sampling_vdc_rr2__(10) % two inputs required
%!error __stk_sampling_vdc_rr2__(10, 3, -1) % two inputs required
%!test
%! n = 300; j = 25;
%! x = __stk_sampling_vdc_rr2__(n, j);
%! assert(isequal(size(x), [n 1]))
%!test
%! x = __stk_sampling_vdc_rr2__(2000, 7);
%! y = double (x(1998:2000, :));
%! yref = [0.849786281294525; 0.085080398941584; 0.555668634235701];
%! assert(stk_isequal_tolrel(y, yref, 1e-13));
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