/usr/share/octave/packages/interval-1.4.1/@infsupdec/subsref.m is in octave-interval 1.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | ## Copyright 2014-2016 Oliver Heimlich
##
## 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
## @defop Method {@@infsupdec} subsref (@var{A}, @var{IDX})
## @defopx Operator {@@infsupdec} {@var{A}(@var{I})}
## @defopx Operator {@@infsupdec} {@var{A}(@var{I1}, @var{I2})}
## @defopx Operator {@@infsupdec} {@var{A}.@var{P}}
##
## Select property @var{P} or elements @var{I} from interval matrix @var{A}.
##
## The index @var{I} may be either @code{:} or an index matrix.
## @comment DO NOT SYNCHRONIZE DOCUMENTATION STRING
## The property @var{P} may correspond to any unary method of the interval's
## class, but usually is either @code{inf}, @code{sup} or
## @code{decorationpart}.
##
## @example
## @group
## x = infsupdec (magic (3), magic (3) + 1);
## x (1)
## @result{} ans = [8, 9]_com
## x (:, 2)
## @result{} ans = 3×1 interval vector
## [1, 2]_com
## [5, 6]_com
## [9, 10]_com
## x.inf
## @result{} ans =
## 8 1 6
## 3 5 7
## 4 9 2
## @end group
## @end example
## @seealso{@@infsupdec/subsasgn}
## @end defop
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2014-11-02
function result = subsref (A, S)
if (nargin ~= 2)
print_usage ();
return
endif
switch (S (1).type)
case "()"
result = newdec (subsref (intervalpart (A), S (1)));
result.dec = subsref (A.dec, S (1));
case "{}"
error ("interval cannot be indexed with {}")
case "."
if (any (strcmp (S(1).subs, methods ("infsupdec"))))
functionname = ["@infsupdec", filesep(), S(1).subs];
elseif (any (strcmp (S(1).subs, methods ("infsup"))))
functionname = ["@infsup", filesep(), S(1).subs];
else
error (["interval property ‘", S(1).subs, "’ is unknown"])
endif
if (nargin (functionname) ~= 1)
error (["‘", S(1).subs, "’ is not a valid interval property"])
endif
result = feval (S (1).subs, A);
otherwise
error ("invalid subscript type")
endswitch
if (numel (S) > 1)
result = subsref (result, S (2:end));
endif
endfunction
%!xtest assert (isequal (infsupdec (magic (3)) ([1, 2, 3]), infsupdec (magic (3) ([1, 2, 3]))));
%!test "from the documentation string";
%! x = infsupdec (magic (3), magic (3) + 1);
%! assert (x (1) == infsupdec (8, 9));
%! assert (x (:, 2) == infsupdec ([1; 5; 9], [2; 6; 10]));
%! assert (x.inf, magic (3));
|