Mercurial > octave
view scripts/deprecated/shift.m @ 31234:a1318deb4584
sparse-xpow.cc: Improve consistency between sparse and full matrices (bug #63080)
sparse-xpow.cc: Return 0x0 matrix for empty inputs of all sizes.
Return early for all-zeros matrix with positive power.
Add FIXME for all-zeros matrix with negative power.
Add BISTs.
author | Arun Giridhar <arungiridhar@gmail.com> |
---|---|
date | Tue, 20 Sep 2022 09:00:02 -0400 |
parents | 5d3faba0342e |
children | 597f3ee61a48 |
line wrap: on
line source
######################################################################## ## ## Copyright (C) 1995-2022 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 Octave; see the file COPYING. If not, see ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{y} =} shift (@var{x}, @var{b}) ## @deftypefnx {} {@var{y} =} shift (@var{x}, @var{b}, @var{dim}) ## ## @code{shift} is deprecated and will be removed in Octave version 10. Use ## @code{circshift} instead. ## ## If @var{x} is a vector, perform a circular shift of length @var{b} of ## the elements of @var{x}. ## ## If @var{x} is a matrix, do the same for each column of @var{x}. ## ## If the optional @var{dim} argument is given, operate along this dimension. ## @seealso{circshift} ## @end deftypefn ## FIXME: DEPRECATED: Remove in version 10. function y = shift (x, b, dim) persistent warned = false; if (! warned) warned = true; warning ("Octave:deprecated-function", "shift is deprecated and will be removed from a future version of Octave, please use circshift instead\n"); endif if (nargin < 2) print_usage (); endif if (numel (x) < 1) error ("shift: X must not be empty"); elseif (! (isscalar (b) && b == fix (b))) error ("shift: B must be an integer"); endif nd = ndims (x); sz = size (x); if (nargin == 3) if (!(isscalar (dim) && dim == fix (dim)) || !(1 <= dim && dim <= nd)) error ("shift: DIM must be an integer and a valid dimension"); endif else ## Find the first non-singleton dimension. (dim = find (sz > 1, 1)) || (dim = 1); endif d = sz(dim); idx = repmat ({':'}, nd, 1); if (b > 0) b = rem (b, d); idx{dim} = [d-b+1:d, 1:d-b]; elseif (b < 0) b = rem (abs (b), d); idx{dim} = [b+1:d, 1:b]; endif y = x(idx{:}); endfunction %!test %! a = [1, 2, 3]; %! b = [4, 5, 6]; %! c = [7, 8, 9]; %! %! r = [a, b, c]; %! m = [a; b; c]; %! %! assert (shift (r, 0), r); %! assert (shift (r, 3), [c, a, b]); %! assert (shift (r, -6), [c, a, b]); %! assert (shift (r, -3), [b, c, a]); %! assert (shift (m, 1), [c; a; b]); %! assert (shift (m, -2), [c; a; b]); ## Test input validation %!error <Invalid call> shift () %!error <Invalid call> shift (1) %!error <X must not be empty> shift ([], 1) %!error <B must be an integer> shift (ones (2), ones (2)) %!error <B must be an integer> shift (ones (2), 1.5) %!error <DIM must be an integer> shift (1, 1, 1.5) %!error <DIM must be .* a valid dimension> shift (1, 1, 0) %!error <DIM must be .* a valid dimension> shift (1, 1, 3)