/usr/share/octave/packages/interval-3.1.0/@infsup/linspace.m is in octave-interval 3.1.0-5.
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 | ## Copyright 2015-2016 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
## @defmethod {@@infsup} linspace (@var{BASE}, @var{LIMIT})
## @defmethodx {@@infsup} linspace (@var{BASE}, @var{LIMIT}, @var{N})
##
## Return a row vector of @var{N} linearly spaced members between @var{BASE}
## and @var{LIMIT}.
##
## If @var{BASE} is greater than @var{LIMIT}, members are returned in
## decreasing order. The default value for @var{N} is 100.
##
## If either @var{BASE} or @var{LIMIT} is not a scalar, the result is a matrix.
##
## Accuracy: The result is an accurate enclosure.
##
## @example
## @group
## transpose (linspace (infsup (0), infsup (10), 4))
## @result{} ans ⊂ 4×1 interval vector
##
## [0]
## [3.3333, 3.3334]
## [6.6666, 6.6667]
## [10]
## @end group
## @end example
## @seealso{linspace}
## @end defmethod
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2015-07-19
function base = linspace (base, limit, n)
if (nargin < 2 || nargin > 3)
print_usage ();
return
endif
if (not (isa (base, "infsup")))
base = infsup (base);
endif
if (not (isa (limit, "infsup")))
limit = infsup (limit);
endif
if (nargin < 3)
n = 100;
endif
l = mpfr_linspace_d (-inf, base.inf, limit.inf, n);
u = mpfr_linspace_d (+inf, base.sup, limit.sup, n);
empty = vec (isempty (base) | isempty (limit));
l(empty, :) = inf;
u(empty, :) = -inf;
l(l == 0) = -0;
base.inf = l;
base.sup = u;
endfunction
%!assert (isequal (linspace (infsup (0), infsup (10), 9), infsup (linspace (0, 10, 9))));
%!# correct use of signed zeros
%!test
%! x = linspace (infsup (0), infsup (0));
%! assert (all (signbit (inf (x))));
%! assert (all (not (signbit (sup (x)))));
|