Added overloaded isempty function for dynSeries class.
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function b = isempty(A)
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%@info:
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%! @deftypefn {Function File} {@var{b} =} isempty (@var{A})
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%! @anchor{@dynSeries/isempty}
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%! @sp 1
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%! Overloads the isempty function for the Dynare time series class (@ref{dynSeries}).
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%! @sp 2
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%! @strong{Inputs}
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%! @sp 1
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%! @table @ @var
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%! @item 1
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%! Dynare time series object instantiated by @ref{dynSeries}.
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%! @end table
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%! @sp 1
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%! @strong{Outputs}
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%! @sp 1
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%! @table @ @var
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%! @item b
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%! Scalar integer (0 or 1).
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%! @end deftypefn
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%@eod:
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% Copyright (C) 2011, 2012 Dynare Team
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%
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% This file is part of Dynare.
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%
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% Dynare is free software: you can redistribute it and/or modify
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% it under the terms of the GNU General Public License as published by
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% the Free Software Foundation, either version 3 of the License, or
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% (at your option) any later version.
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%
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% Dynare is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU General Public License
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% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
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% AUTHOR(S) stephane DOT adjemian AT univ DASH lemans DOT fr
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b = isempty(A.data) && isequal(A.nobs,0) && isequal(A.vobs,0);
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