44 lines
1.4 KiB
Matlab
44 lines
1.4 KiB
Matlab
function [xdsube,Brow,Erow] = fn_dataext(Byrqm,Eyrqm,xdatae)
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% xdsube = dataext(Byrqm,Eyrqm,xdatae)
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% Extract subset of xdatae, given Byrqm and Eyrqm
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%
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% Byrqm: [year quarter(month)]: beginning year and period. If Byqm(2)=0, we get annual data.
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% Eyrqm: [year period]: end year and period. If Byrqm(2)=0, it must be Eyrqm(2)=0.
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% xdatae: all data (some of which may be NaN) with the first 2 columns indicating years and periods.
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%----------
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% xdsube: subset of xdatae.
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% Brow: the row number in xdatee that marks the first row of xdsube.
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% Erow: the row number in xdatee that marks the last row of xdsube.
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%
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% Tao Zha, April 2000
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if (Byrqm(2)==0) & (Eyrqm(2)~=0)
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error('If annual data, make sure both Byrqm(2) and Eyrqm(2) are zero')
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end
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Brow = min(find(xdatae(:,1)==Byrqm(1)));
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if isempty(Brow)
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error('Byrqm is outside the date range indicated by xdatae(:,1:2)!')
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end
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if Byrqm(2)>0
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nadt=Byrqm(2)-xdatae(Brow,2);
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if nadt<0
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error('Byrqm is outside the date range indicated by xdatae(:,1:2)!')
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end
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Brow=Brow+nadt;
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end
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%
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Erow = min(find(xdatae(:,1)==Eyrqm(1)));
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if isempty(Erow)
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error('Eyrqm is outside the date range indicated by xdatae(:,1:2)!')
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end
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if Eyrqm(2)>0
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nadt2=Eyrqm(2)-xdatae(Erow,2);
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if nadt<0
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error('Eyrqm is outside the date range indicated by xdatae(:,1:2)!')
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end
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Erow=Erow+nadt2;
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end
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%
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xdsube = xdatae(Brow:Erow,:); % with dates
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