/usr/share/octave/packages/control-2.6.2/@iddata/nkshift.m is in octave-control 2.6.2-1build1.
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 | ## Copyright (C) 2009-2014 Lukas F. Reichlin
##
## This file is part of LTI Syncope.
##
## LTI Syncope 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.
##
## LTI Syncope 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 LTI Syncope. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{dat} =} nkshift (@var{dat}, @var{nk})
## @deftypefnx {Function File} {@var{dat} =} nkshift (@var{dat}, @var{nk}, @var{'append'})
## Shift input channels of dataset @var{dat} according to integer @var{nk}.
## A positive value of @var{nk} means that the input channels are delayed
## @var{nk} samples. By default, both input and output signals are shortened
## by @var{nk} samples.
## If a third argument @var{'append'} is passed, the output signals are left
## untouched while @var{nk} zeros are appended to the (shortened) input signals
## such that the number of samples in @var{dat} remains constant.
## @end deftypefn
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: July 2012
## Version: 0.1
function dat = nkshift (dat, nk = 0)
if (nargin > 3)
print_usage ();
endif
if (! is_real_scalar (nk))
error ("iddata: nkshift: 'nk' must be a scalar integer");
endif
## TODO: - nk per inputs
## - frequency-domain data
snk = sign (nk);
nk = abs (nk);
if (nargin == 2) # default: shortening y and u by nk
if (snk >= 0)
dat.y = cellfun (@(y) y(nk+1:end, :), dat.y, "uniformoutput", false);
dat.u = cellfun (@(u) u(1:end-nk, :), dat.u, "uniformoutput", false);
else
dat.y = cellfun (@(y) y(1:end-nk, :), dat.y, "uniformoutput", false);
dat.u = cellfun (@(u) u(nk+1:end, :), dat.u, "uniformoutput", false);
endif
else # append: keep y, padding u with nk zeros
[~, ~, m] = size (dat);
if (snk >= 0)
dat.u = cellfun (@(u) [zeros(nk, m), u(1:end-nk, :)], dat.u, "uniformoutput", false);
else
dat.u = cellfun (@(u) [u(nk+1:end, :), zeros(nk, m)], dat.u, "uniformoutput", false);
endif
endif
endfunction
|