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########################################################################
##
## Copyright (C) 1995-2024 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} =} sinetone (@var{freq}, @var{rate}, @var{sec}, @var{ampl})
## Return a sinetone of frequency @var{freq} with a length of @var{sec}
## seconds at sampling rate @var{rate} and with amplitude @var{ampl}.
##
## The arguments @var{freq} and @var{ampl} may be vectors of common size.
##
## The defaults are @var{rate} = 8000, @var{sec} = 1, and @var{ampl} = 64.
## @seealso{sinewave}
## @end deftypefn
function y = sinetone (freq, rate = 8000, sec = 1, ampl = 64)
if (nargin < 1)
print_usage ();
endif
[err, freq, ampl] = common_size (freq, ampl);
if (err || ! isvector (freq))
error ("sinetone: FREQ and AMPL must be vectors of common size");
endif
if (! (isscalar (rate) && isscalar (sec)))
error ("sinetone: RATE and SEC must be scalars");
endif
n = length (freq);
ns = round (rate * sec);
y = zeros (ns, n);
for k = 1:n
y(:, k) = ampl(k) * sin (2 * pi * (1:ns) / rate * freq(k))';
endfor
endfunction
%!assert (size (sinetone (18e6, 150e6, 19550/150e6, 1)), [19550, 1])
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