validString

 - helper function to validate that a variable represents a valid string

 copyright 2009-2012 Blair Armstrong, Christine Watson, David Plaut

    This file is part of SOS

    SOS is free software: you can redistribute it and/or modify
    it for academic and non-commercial purposes
    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.  For commercial or for-profit
    uses, please contact the authors (sos@cnbc.cmu.edu).

    SOS 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.

0001 % - helper function to validate that a variable represents a valid string
0002 %
0003 % copyright 2009-2012 Blair Armstrong, Christine Watson, David Plaut
0004 %
0005 %    This file is part of SOS
0006 %
0007 %    SOS is free software: you can redistribute it and/or modify
0008 %    it for academic and non-commercial purposes
0009 %    under the terms of the GNU General Public License as published by
0010 %    the Free Software Foundation, either version 3 of the License, or
0011 %    (at your option) any later version.  For commercial or for-profit
0012 %    uses, please contact the authors (sos@cnbc.cmu.edu).
0013 %
0014 %    SOS is distributed in the hope that it will be useful,
0015 %    but WITHOUT ANY WARRANTY; without even the implied warranty of
0016 %    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0017 %    GNU General Public License for more details.
0018 
0019 %    You should have received a copy of the GNU General Public License
0020 %    along with SOS (see COPYING.txt).
0021 %    If not, see <http://www.gnu.org/licenses/>.
0022 
0023 function flag = validString(str)
0024     % checks whether str is a string object
0025     
0026     if (ischar(str) == true)
0027         flag = 1;
0028     else
0029         error('ERROR: <str> must be a string, if it is specified.');
0030     end
0031     
0032 end %validStringOrNull