## Copyright (C) 1996, 1998 Auburn University.  All rights reserved.
##
## 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 USA.

## -*- texinfo -*-
## @deftypefn {Function File} {@var{ioname} =} sysdefioname (@var{n},@var{str} @{,@var{m}@})
## return default input or output names given @var{n}, @var{str}, @var{m}.
## @var{n} is the final value, @var{str} is the string prefix, and @var{m}
## is start value
##
## used internally, minimal argument checking
##
## @strong{Example} @code{ioname = sysdefioname(5,"u",3)}
## returns the list:
## @example
## ioname =
## (
##   [1] = u_3
##   [2] = u_4
##   [3] = u_5
## )
## @end example
## @end deftypefn

function ioname = sysdefioname (n, str, m)

  if (nargin < 2 | nargin > 3)
    usage("ioname = sysdefioname(n,str[,m])");
  endif

  if (nargin == 2)           m = min(1,n);            endif

  ioname = list();
  jj = 1;
  if(n > 0 & m > 0 & m <= n)
    for ii = m:n
      ioname(ii+1-m) = sprintf("%s_%d",str,ii);
    endfor
  elseif(m > n)
    error("str=%s; start value m=%d > final value n=%d",str,m,n);
  endif

endfunction