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function resu = ismatrix(df)
%# function resu = ismatrix(df)
%# returns true if the dataframe can be converted to a matrix
%% Copyright (C) 2009-2017 Pascal Dupuis <cdemills@gmail.com>
%%
%% This file is part of the dataframe package for Octave.
%%
%% This package 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, or (at your option) any later version.
%%
%% This package 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 this package; see the file COPYING. If not,
%% see <http://www.gnu.org/licenses/>.
df_is_num = isnumeric(df.x_data{1});
df_is_char = ischar(df.x_data{1});
for indi = df.x_cnt(2):-1:2,
df_is_num = df_is_num & isnumeric(df.x_data{indi});
df_is_char = df_is_char & ischar(df.x_data{indi});
end
resu = df_is_num | df_is_char;
end
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