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nargchk.m
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1996-07-12
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## 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.
## 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.
## Author: jwe
function retval = nargchk (nargin_min, nargin_max, n)
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