Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / signal-1.1.3 / gausswin.m

diff --git a/octave_packages/signal-1.1.3/gausswin.m b/octave_packages/signal-1.1.3/gausswin.m
new file mode 100644 (file)
index 0000000..33232f7
--- /dev/null
+++ b/octave_packages/signal-1.1.3/gausswin.m
@@ -0,0 +1,33 @@
+## Copyright (C) 1999 Paul Kienzle <pkienzle@users.sf.net>
+##
+## 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/>.
+
+## usage: w = gausswin(L, a)
+##
+## Generate an L-point gaussian window of the given width. Use larger a
+## for a narrow window.  Use larger L for a smoother curve. 
+##
+##     w = exp ( -(a*x)^2/2 )
+##
+## for x = linspace(-(L-1)/L, (L-1)/L, L)
+
+function x = gausswin(L, w)
+
+  if nargin < 1 || nargin > 2
+    print_usage;
+  end
+  if nargin == 1, w = 2.5; endif
+  x = exp ( -0.5 * ( w/L * [ -(L-1) : 2 : L-1 ]' ) .^ 2 );
+
+endfunction