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/usr/share/octave/packages/secs2d-0.0.8/Utilities/URREcyclingpattern.m is in octave-secs2d 0.0.8-5.

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function RREpattern = URREcyclingpattern(RREnnit,RRErank,maxit);

% prcomputes cycling pattern for RRE extrapolation:
%
% -1         = Do Nothing
% 0          = extrapolate
% 1..RRErank = store
%
% RREpattern = URREcyclingpattern(RREnnit,RRErank,toll);
%

% This file is part of 
%
%            SECS2D - A 2-D Drift--Diffusion Semiconductor Device Simulator
%         -------------------------------------------------------------------
%            Copyright (C) 2004-2006  Carlo de Falco
%
%
%
%  SECS2D 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 2 of the License, or
%  (at your option) any later version.
%
%  SECS2D 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 SECS2D; If not, see <http://www.gnu.org/licenses/>.

RREpattern = zeros(RREnnit(1),1)-1;

while length(RREpattern)<maxit
    RREpattern = [...
        RREpattern
        [1:RRErank]'
        0
        (zeros(RREnnit(2),1)-1)...
        ];
end