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function [xdsube,Brow,Erow] = fn_dataext2(Byrqm,Eyrqm,xdatae)
% xdsube = dataext(Byrqm,Eyrqm,xdatae)
% Extract subset of xdatae, given Byrqm and Eyrqm
%
% Byrqm: [year quarter(month)]: beginning year and period. If Byqm(2)=0, we get annual data.
% Eyrqm: [year period]: end year and period. If Byrqm(2)=0, it must be Eyrqm(2)=0.
% xdatae: all data (some of which may be NaN) with the first 2 columns indicating years and periods.
%----------
% xdsube: subset of xdatae.
% Brow: the row number in xdatee that marks the first row of xdsube.
% Erow: the row number in xdatee that marks the last row of xdsube.
%
% Tao Zha, April 2000
%
% Copyright (C) 1997-2012 Tao Zha
%
% This 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.
%
% It 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.
%
% If you did not received a copy of the GNU General Public License
% with this software, see <http://www.gnu.org/licenses/>.
%
if (Byrqm(2)==0)
Eyrqm(2)=0;
q_m1=find(xdatae(:,2)==xdatae(1,2)); % Locating quarter or month
if length(q_m1)<2
error('The matrix xdatae must at least have a cycle of q_m periods for possibly one calendar year')
end
q_m=q_m1(2)-1;
end
Brow = min(find(xdatae(:,1)==Byrqm(1)));
if isempty(Brow)
error('Byrqm is outside the date range indicated by xdatae(:,1:2)!')
end
if Byrqm(2)>0
nadt=Byrqm(2)-xdatae(Brow,2);
if nadt<0
error('Byrqm is outside the date range indicated by xdatae(:,1:2)!')
end
Brow=Brow+nadt;
end
%
Erow = min(find(xdatae(:,1)==Eyrqm(1)));
if isempty(Erow)
error('Eyrqm is outside the date range indicated by xdatae(:,1:2)!')
end
if Eyrqm(2)>0
nadt2=Eyrqm(2)-xdatae(Erow,2);
if nadt<0
error('Eyrqm is outside the date range indicated by xdatae(:,1:2)!')
end
Erow=Erow+nadt2;
end
%
if (Byrqm(2)==0) % By calendar years.
if (xdatae(Brow,2)~=1) | (xdatae(Erow,2)~=1)
error('Calendar years extracted here must have q_m periods')
end
Erow=Erow+q_m-1;
end
xdsube = xdatae(Brow:Erow,:); % with dates
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