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function set_dynare_seed(a,b)
% Set seeds depending on matlab (octave) version. This routine is called in dynare_config and can be called by the
% user in the mod file.
%
% Copyright (C) 2010-2012 Dynare Team
%
% This file is part of Dynare.
%
% Dynare 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.
%
% Dynare 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 Dynare. If not, see <http://www.gnu.org/licenses/>.
global options_
if ~nargin
error('set_dynare_seed:: I need at least one input argument!')
end
matlab_random_streams = ~(exist('OCTAVE_VERSION') || matlab_ver_less_than('7.7'));
if matlab_random_streams% Use new matlab interface.
if nargin==1
if ischar(a) && strcmpi(a,'default')
options_.DynareRandomStreams.algo = 'mt19937ar';
options_.DynareRandomStreams.seed = 0;
s = RandStream(options_.DynareRandomStreams.algo,'Seed',options_.DynareRandomStreams.seed);
if matlab_ver_less_than('7.12')
reset(RandStream.setDefaultStream(s));
else
reset(RandStream.setGlobalStream(s));
end
return
end
if ischar(a) && strcmpi(a,'reset')
s = RandStream(options_.DynareRandomStreams.algo,'Seed',options_.DynareRandomStreams.seed);
if matlab_ver_less_than('7.12')
reset(RandStream.setDefaultStream(s));
else
reset(RandStream.setGlobalStream(s));
end
return
end
if ischar(a)
error('set_dynare_seed:: something is wrong in the calling sequence!')
end
if ~ischar(a)
options_.DynareRandomStreams.algo = 'mt19937ar';
options_.DynareRandomStreams.seed = a;
s = RandStream(options_.DynareRandomStreams.algo,'Seed',options_.DynareRandomStreams.seed);
if matlab_ver_less_than('7.12')
reset(RandStream.setDefaultStream(s));
else
reset(RandStream.setGlobalStream(s));
end
return
end
elseif nargin==2
if ~ischar(a) || ~( strcmpi(a,'mcg16807') || ...
strcmpi(a,'mlfg6331_64') || ...
strcmpi(a,'mrg32k3a') || ...
strcmpi(a,'mt19937ar') || ...
strcmpi(a,'shr3cong') || ...
strcmpi(a,'swb2712') )
disp('set_dynare_seed:: First argument must be string designing the uniform random number algorithm!')
RandStream.list
disp(' ')
disp('set_dynare_seed:: Change the first input accordingly...')
disp(' ')
error(' ')
end
if ~isint(b)
error('set_dynare_seed:: The second input argument must be an integer!')
end
options_.DynareRandomStreams.algo = a;
options_.DynareRandomStreams.seed = b;
s = RandStream(options_.DynareRandomStreams.algo,'Seed',options_.DynareRandomStreams.seed);
if matlab_ver_less_than('7.12')
reset(RandStream.setDefaultStream(s));
else
reset(RandStream.setGlobalStream(s));
end
end
else% Use old matlab interface.
if nargin==1
if ischar(a) && strcmpi(a,'default')
if exist('OCTAVE_VERSION') || matlab_ver_less_than('7.4')
options_.DynareRandomStreams.algo = 'state';
else
% Twister was introduced in MATLAB 7.4
options_.DynareRandomStreams.algo = 'twister';
end
options_.DynareRandomStreams.seed = 0;
rand(options_.DynareRandomStreams.algo,options_.DynareRandomStreams.seed);
randn('state',options_.DynareRandomStreams.seed);
return
end
if ischar(a) && strcmpi(a,'reset')
rand(options_.DynareRandomStreams.algo,options_.DynareRandomStreams.seed);
randn('state',options_.DynareRandomStreams.seed);
return
end
if ~ischar(a) && isint(a)
options_.DynareRandomStreams.seed = a;
rand(options_.DynareRandomStreams.algo,options_.DynareRandomStreams.seed);
randn('state',options_.DynareRandomStreams.seed);
else
error('set_dynare_seed:: Something is wrong in the calling sequence!')
end
else
error('set_dynare_seed:: Cannot use more than one input argument with your version of Matlab/Octave!')
end
end
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