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nargchk.m
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1996-09-28
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# Copyright (C) 1994, 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.
function retval = nargchk (nargin_min, nargin_max, n)
# usage: nargchk (nargin_min, nargin_max, n)
#
# If N is in the range NARGIN_MIN to NARGIN_MAX, return the empty
# matrix. Otherwise, return a message indicating whether N is too
# large or too small.
if (nargin != 3)
usage ("nargchk (nargin_min, nargin_max, n)");
endif
if (nargin_min > nargin_max)
error ("nargchk: nargin_min > nargin_max");
endif
if (n < nargin_min)
retval = "nargchk: N is less than nargin_min";
elseif (n > nargin_max)
retval = "nargchk: N is greater than nargin_max";
else
retval = [];
endif
endfunction