/usr/share/octave/packages/control-2.6.2/gensig.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 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 96 97 98 | ## 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{u}, @var{t}] =} gensig (@var{sigtype}, @var{tau})
## @deftypefnx{Function File} {[@var{u}, @var{t}] =} gensig (@var{sigtype}, @var{tau}, @var{tfinal})
## @deftypefnx{Function File} {[@var{u}, @var{t}] =} gensig (@var{sigtype}, @var{tau}, @var{tfinal}, @var{tsam})
## Generate periodic signal. Useful in combination with lsim.
##
## @strong{Inputs}
## @table @var
## @item sigtype = "sin"
## Sine wave.
## @item sigtype = "cos"
## Cosine wave.
## @item sigtype = "square"
## Square wave.
## @item sigtype = "pulse"
## Periodic pulse.
## @item tau
## Duration of one period in seconds.
## @item tfinal
## Optional duration of the signal in seconds. Default duration is 5 periods.
## @item tsam
## Optional sampling time in seconds. Default spacing is tau/64.
## @end table
##
## @strong{Outputs}
## @table @var
## @item u
## Vector of signal values.
## @item t
## Time vector of the signal.
## @end table
##
## @seealso{lsim}
## @end deftypefn
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: August 2009
## Version: 0.4
function [u, t] = gensig (sigtype, tau, tfinal, tsam)
if (nargin < 2 || nargin > 4)
print_usage ();
endif
if (! ischar (sigtype))
error ("gensig: first argument must be a string");
endif
if (! issample (tau))
error ("gensig: second argument is not a valid period");
endif
if (nargin < 3)
tfinal = 5 * tau;
elseif (! issample (tfinal))
error ("gensig: third argument is not a valid final time");
endif
if (nargin < 4)
tsam = tau / 64;
elseif (! issample (tsam))
error ("gensig: fourth argument is not a valid sampling time");
endif
t = reshape (0 : tsam : tfinal, [], 1);
switch (lower (sigtype(1:2)))
case "si"
u = sin (2*pi/tau * t);
case "co"
u = cos (2*pi/tau * t);
case "sq"
u = double (rem (t, tau) >= tau/2);
case "pu"
u = double (rem (t, tau) < (1 - 1000*eps) * tsam);
otherwise
error ("gensig: '%s' is an invalid signal type", sigtype);
endswitch
endfunction
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