/usr/share/octave/packages/interval-2.1.0/@infsup/cat.m is in octave-interval 2.1.0-2.
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##
## This program 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.
##
## This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @documentencoding UTF-8
## @defmethod {@@infsup} cat (@var{DIM}, @var{MATRIX1}, @var{MATRIX2}, @dots{})
##
## Return the concatenation of interval matrices @var{MATRIX1}, @var{MATRIX2},
## … along dimension @var{DIM}.
##
## Interval matrices support no more than 2 dimensions.
##
## @example
## @group
## cat (2, infsup (magic (3)), infsup (pascal (3)))
## @result{} 3×6 interval matrix
##
## [8] [1] [6] [1] [1] [1]
## [3] [5] [7] [1] [2] [3]
## [4] [9] [2] [1] [3] [6]
## @end group
## @end example
## @seealso{@@infsup/horzcat, @@infsup/vertcat}
## @end defmethod
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2015-04-19
function result = cat (dim, varargin)
if (isa (dim, "infsup"))
print_usage ();
return
endif
if (dim > 2)
error ("interval:InvalidOperand", ...
"cat: no more than 2 dimensions are supported");
endif
## Conversion of non-interval parameters to intervals
interval_idx = cellfun ("isclass", varargin, "infsup");
to_convert_idx = not (interval_idx);
varargin(to_convert_idx) = cellfun (@infsup, ...
varargin(to_convert_idx), ...
"UniformOutput", false);
## Stack intervals along dimension dim
s = cellfun ("struct", varargin); # struct array
result = infsup ();
result.inf = cat (dim, s.inf);
result.sup = cat (dim, s.sup);
endfunction
%!assert (size (cat (1, infsup ([]), infsup ([]))), [0 0]);
%!assert (cat (1, infsup (1), infsup (2)) == infsup (cat (1, 1, 2)));
%!assert (cat (2, infsup (1), infsup (2)) == infsup (cat (2, 1, 2)));
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