/usr/share/octave/packages/interval-3.1.0/@infsup/prepad.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 86 87 88 89 90 91 92 93 94 95 | ## Copyright 2015-2017 Oliver Heimlich
## Copyright 2017 Joel Dahne
##
## 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} prepad (@var{X}, @var{L})
## @defmethodx {@@infsup} prepad (@var{X}, @var{L}, @var{C})
## @defmethodx {@@infsup} prepad (@var{X}, @var{L}, @var{C}, @var{DIM})
##
## Prepend the scalar interval value @var{C} to the interval 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}) > L}, elements from the beginning of @var{X} are
## removed until an interval vector of length @var{L} is obtained.
##
## If @var{X} is an interval matrix, elements are prepended or removed from
## each row or column.
##
## If the optional argument DIM is given, operate along this dimension.
##
## If DIM is larger than the dimension of X, the result will have DIM
## dimensions.
##
## @example
## @group
## prepad (infsup (1 : 3), 5, 42)
## @result{} ans = 1×5 interval vector
## [42] [42] [1] [2] [3]
## @end group
## @end example
## @seealso{@@infsup/reshape, @@infsup/cat, @@infsup/postpad, @@infsup/resize}
## @end defmethod
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2015-04-19
function x = prepad (x, len, c, dim)
if (nargin < 2 || nargin > 4)
print_usage ();
return
endif
if (not (isa (x, "infsup")))
x = infsup (x);
endif
if (isa (len, "infsup"))
error ("interval:InvalidOperand", "prepad: len must not be an interval");
endif
if (nargin < 3)
c = infsup (0);
elseif (not (isa (c, "infsup")))
c = infsup (c);
endif
if (nargin < 4)
dim = find (size (x.inf) ~= 1, 1);
if (isempty (dim))
dim = 1;
endif
elseif (isa (dim, "infsup"))
error ("interval:InvalidOperand", "prepad: dim must not be an interval");
endif
x.inf = prepad (x.inf, len, c.inf, dim);
x.sup = prepad (x.sup, len, c.sup, dim);
endfunction
%!assert (prepad (infsup (2:4), 4, 1) == infsup (1:4));
%!assert (prepad (infsup (0:2), 2, 1) == infsup (1:2));
%!test
%! if (compare_versions (OCTAVE_VERSION (), "4.0.0", ">="))
%! assert (prepad (infsup (0), 10, 0, 3) == infsup (zeros (1, 1, 10)))
%! else
%! # In Octave 3.8.x it is not possible to increase the number of dimensions.
%! endif
%!assert (prepad (infsup (zeros (1, 2, 2)), 3) == infsup (zeros (1, 3, 2)));
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