### Copyright (C) 1996 John W. Eaton
###
### 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.

function retval = is_matrix (x)

  ## usage: is_matrix (x)
  ##
  ## Return 1 if the number of rows and columns of x are both greater
  ## than 1.
  ##
  ## See also: size, rows, columns, length, is_scalar, is_vector

  if (nargin == 1)
    [nr, nc] = size (x);
    retval = (nr > 1 && nc > 1);
  else
    usage ("is_matrix (x)");
  endif

endfunction