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function [A, B] = df_basecomp(A, B);
%# function [A, B] = df_basecomp(A, B)
%# Basic size verifcation for binary operations on dataframe. Returns
%# a scalar, a matrix, or a dataframe. Cell arrays are converted to df.
%% Copyright (C) 2009-2010 Pascal Dupuis <Pascal.Dupuis@uclouvain.be>
%%
%% This file is part of Octave.
%%
%% Octave 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 2, or (at your option) any later version.
%%
%% Octave 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 Octave; see the file COPYING. If not,
%% write to the Free Software Foundation, 59 Temple Place -
%% Suite 330, Boston, MA 02111-1307, USA.
%#
%# $Id: df_basecomp.m 852 2010-07-22 10:47:55Z dupuis $
%#
if isscalar(A) || isscalar(B)
return
endif
if iscell(A),
A = dataframe(A);
elseif iscell(B),
B = dataframe(B);
endif
if any(size(A) - size(B)),
error("Non compatible sizes");
endif
if !isa(A, 'dataframe') || !isa(B, 'dataframe'),
return; %# don't go further with names/indexes comparisons
endif
if any(A._ridx-B._ridx),
error("Non compatible indexes");
endif
if !isempty(A._name{1}) && !isempty(B._name{1})
if !any(strcmp(cellstr(A._name{1}), cellstr(B._name{1}))),
error("Incompatible row names");
endif
endif
if !isempty(A._name{2}) && !isempty(B._name{2})
if !any(strcmp(cellstr(A._name{2}), cellstr(B._name{2}))),
error("Incompatible column names");
endif
endif
endfunction

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