/usr/share/octave/packages/interval-1.4.1/@infsupdec/prepad.m is in octave-interval 1.4.1-1.
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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 | ## 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 {@@infsupdec} prepad (@var{X}, @var{L})
## @defmethodx {@@infsupdec} prepad (@var{X}, @var{L}, @var{C})
## @defmethodx {@@infsupdec} 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.
##
## @example
## @group
## prepad (infsupdec (1 : 3), 5, 42)
## @result{} ans = 1×5 interval vector
## [42]_com [42]_com [1]_com [2]_com [3]_com
## @end group
## @end example
## @seealso{@@infsupdec/reshape, @@infsup/cat, @@infsupdec/postpad, @@infsupdec/resize}
## @end defmethod
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2015-04-19
function result = prepad (x, len, c, dim)
if (nargin < 2 || nargin > 4)
print_usage ();
return
endif
if (not (isa (x, "infsupdec")))
x = infsupdec (x);
endif
if (nargin < 3)
c = infsupdec (0);
elseif (not (isa (c, "infsupdec")))
c = infsupdec (c);
endif
if (nargin < 4)
if (isvector (x.dec) && not (isscalar (x.dec)))
dim = find (size (x.dec) ~= 1, 1);
else
dim = 1;
endif
endif
if (isnai (x))
result = x;
return
endif
if (isnai (c))
result = c;
return
endif
result = newdec (prepad (intervalpart (x), len, intervalpart (c), dim));
result.dec = prepad (x.dec, len, c.dec, dim);
endfunction
%!xtest assert (isequal (prepad (infsupdec (2:4), 4, 1), infsupdec (1:4)));
%!xtest assert (isequal (prepad (infsupdec (0:2), 2, 1), infsupdec (1:2)));
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