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+## Copyright (C) 1995, 1996, 1997  Friedrich Leisch
+## 
+## 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 2, 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 file.  If not, write to the Free Software Foundation,
+## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+## usage:  sinetone (freq [, rate [, sec [, ampl]]])
+##
+## Returns a sinetone of frequency freq with length of sec seconds at
+## sampling rate rate and with amplitude ampl.  freq and ampl may be
+## vectors of common size.
+##
+## Defaults are rate = 8000, sec = 1 and ampl = 64.
+    
+## Author:  FL <Friedrich.Leisch@ci.tuwien.ac.at>
+## Description:  Compute a sine tone
+  
+function retval = sinetone (f, r, s, a)
+  
+  if (nargin == 1)
+    r = 8000;
+    s = 1;
+    a = 64;
+  elseif (nargin == 2)
+    s = 1;
+    a = 64;
+  elseif (nargin == 3)
+    a = 64;
+  elseif ((nargin < 1) || (nargin > 4))
+    usage ("sinetone (freq [, rate [, sec [, ampl]]])");
+  endif
+  
+  [err, f, a] = common_size (f, a);
+  if (err || ! is_vector (f))
+    error ("sinetone:  freq and ampl must be vectors of common size");
+  endif
+  
+  if !(is_scalar (r) && is_scalar (s))
+    error ("sinetone:  rate and sec must be scalars");
+  endif
+
+  n = length (f);
+
+  retval = zeros (r * s, n);
+  for k = 1:n
+    retval (:, k) = a(k) * sin (2 * pi * (1:r*s) / r * f(k))';
+  endfor
+  
+endfunction
+