function [yt, j0, ir, ic]=teff(T,Nsam,istable)
% [yt, j0, ir, ic]=teff(T,Nsam,istable)
%
% Written by Marco Ratto
% Joint Research Centre, The European Commission,
% marco.ratto@ec.europa.eu
%
% Reference:
% M. Ratto, Global Sensitivity Analysis for Macroeconomic models, MIMEO, 2006.

% Copyright © 2012 European Commission
% Copyright © 2012-2023 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 <https://www.gnu.org/licenses/>.

ndim = (length(size(T)));
if ndim==3
    if nargin==1
        Nsam=size(T,3);
        istable = [1:Nsam]';
    end
    tmax=max(T,[],3);
    tmin=min(T,[],3);
    [ir, ic]=(find( (tmax-tmin)>1.e-8));
    j0 = length(ir);
    yt=zeros(Nsam, j0);
    for j=1:j0
        y0=squeeze(T(ir(j),ic(j),:));
        y1=ones(Nsam,1)*NaN;
        y1(istable,1)=y0;
        yt(:,j)=y1;
    end
else
    tmax=max(T,[],2);
    tmin=min(T,[],2);
    ir=(find( (tmax-tmin)>1.e-8));
    j0 = length(ir);
    yt=NaN(Nsam, j0);
    yt(istable,:)=T(ir,:)';
end
