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## Copyright (C) 1994-2013 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 3 of the License, 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, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} postpad (@var{x}, @var{l})
## @deftypefnx {Function File} {} postpad (@var{x}, @var{l}, @var{c})
## @deftypefnx {Function File} {} postpad (@var{x}, @var{l}, @var{c}, @var{dim})
## Append the scalar value @var{c} to the vector @var{x} until it is of length
## @var{l}. If @var{c} is not given, a value of 0 is used.
##
## If @code{length (@var{x}) > @var{l}}, elements from the end of
## @var{x} are removed until a vector of length @var{l} is obtained.
##
## If @var{x} is a matrix, elements are appended or removed from each row.
##
## If the optional argument @var{dim} is given, operate along this
## dimension.
## @seealso{prepad, cat, resize}
## @end deftypefn
## Author: Tony Richardson <arichard@stark.cc.oh.us>
## Created: June 1994
function y = postpad (x, l, c, dim)
if (nargin < 2 || nargin > 4)
print_usage ();
endif
if (nargin < 3 || isempty (c))
c = 0;
else
if (! isscalar (c))
error ("postpad: third argument must be empty or a scalar");
endif
endif
nd = ndims (x);
sz = size (x);
if (nargin < 4)
## Find the first non-singleton dimension.
(dim = find (sz > 1, 1)) || (dim = 1);
else
if (!(isscalar (dim) && dim == fix (dim))
|| !(1 <= dim && dim <= nd))
error ("postpad: DIM must be an integer and a valid dimension");
endif
endif
if (! isscalar (l) || l < 0)
error ("postpad: second argument must be a positive scaler");
endif
if (dim > nd)
sz(nd+1:dim) = 1;
endif
d = sz (dim);
if (d >= l)
idx = repmat ({':'}, nd, 1);
idx{dim} = 1:l;
y = x(idx{:});
else
sz (dim) = l - d;
y = cat (dim, x, c(ones (sz)));
endif
endfunction
%!assert (postpad ([1,2], 4), [1,2,0,0])
%!assert (postpad ([1;2], 4), [1;2;0;0])
%!assert (postpad ([1,2], 4, 2), [1,2,2,2])
%!assert (postpad ([1;2], 4, 2), [1;2;2;2])
%!assert (postpad ([1,2], 2, 2, 1), [1,2;2,2])
%!error postpad ()
%!error postpad (1)
%!error postpad (1,2,3,4,5)
%!error postpad ([1,2], 2, 2,3)
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