[Octave-cvsupdate] SF.net SVN: octave:[6097] trunk/octave-forge/main/control

[<par...@us...>]

Revision: 6097
          http://octave.svn.sourceforge.net/octave/?rev=6097&view=rev
Author:   paramaniac
Date:     2009-08-15 18:44:39 +0000 (Sat, 15 Aug 2009)

Log Message:
-----------
add new function gensig

Modified Paths:
--------------
    trunk/octave-forge/main/control/INDEX

Added Paths:
-----------
    trunk/octave-forge/main/control/inst/gensig.m

Modified: trunk/octave-forge/main/control/INDEX
===================================================================
--- trunk/octave-forge/main/control/INDEX	2009-08-14 06:32:41 UTC (rev 6096)
+++ trunk/octave-forge/main/control/INDEX	2009-08-15 18:44:39 UTC (rev 6097)
@@ -51,7 +51,7 @@
  is_signal_list is_stable
  isct isdt
 Time domain analysis
- c2d d2c dmr2d damp dcgain impulse step
+ c2d d2c dmr2d damp dcgain impulse step gensig
 Frequency domain analysis
  frdemo
  bode bode_bounds nichols

Added: trunk/octave-forge/main/control/inst/gensig.m
===================================================================
--- trunk/octave-forge/main/control/inst/gensig.m	                        (rev 0)
+++ trunk/octave-forge/main/control/inst/gensig.m	2009-08-15 18:44:39 UTC (rev 6097)
@@ -0,0 +1,90 @@
+## Copyright (C) 2009 Lukas Reichlin <luk...@sw...>
+##
+## 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 3 of the License, 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 program.  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
+
+## Version: 0.1
+
+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 (nargin < 3)
+    tfinal = 5 * tau;
+  endif
+  
+  if (nargin < 4)
+    tsam = tau / 64;
+  endif
+  
+  t = (0 : tsam : tfinal)';
+  
+  sigtype = lower (sigtype);
+  
+  switch (sigtype(1:2))
+    case "si"
+      u = sin (2*pi/tau * t);
+    case "co"
+      u = cos (2*pi/tau * t);
+    case "sq"
+      u = +(rem (t, tau) >= tau/2);
+    case "pu"
+      u = +(rem (t, tau) < (1 - 1000*eps) * tsam);
+    otherwise
+      error ("gensig: invalid signal type");
+  endswitch
+  
+endfunction
+
+## FIXME: Add a test
\ No newline at end of file


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