--- /dev/null
+function resu = ismatrix(df)
+ %# function resu = ismatrix(df)
+ %# returns true if the dataframe can be converted to a matrix
+
+ %% Copyright (C) 2009-2012 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, 51 Franklin Street -
+ %% Fifth Floor, Boston, MA 02110-1301, USA.
+
+ %#
+ %# $Id: ismatrix.m 9585 2012-02-05 15:32:46Z cdemills $
+ %#
+
+ df_is_num = isnumeric(df._data{1});
+ df_is_char = ischar(df._data{1});
+ for indi = df._cnt(2):-1:2,
+ df_is_num = df_is_num & isnumeric(df._data{indi});
+ df_is_char = df_is_char & ischar(df._data{indi});
+ endfor
+
+ resu = df_is_num | df_is_char;
+
+endfunction