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function freq = string2freq(s)
% INPUTS
% o s character, equal to Y, Q, M or W (resp. annual, quaterly, monthly or weekly)
%
% OUTPUTS
% o freq scalar integer, equal to 1, 4, 12 or 52 (resp. annual, quaterly, monthly or weekly)
% Copyright (C) 2013 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/>.
switch upper(s)
case {'Y','A'}
freq = 1;
case 'Q'
freq = 4;
case 'M'
freq = 12;
case 'W'
freq = 52;
otherwise
error('dates::freq2string: Unknown frequency!')
end
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