Add a useful package (from Source forge) for octave

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

diff --git a/octave_packages/signal-1.1.3/bohmanwin.m b/octave_packages/signal-1.1.3/bohmanwin.m
new file mode 100644 (file)
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+++ b/octave_packages/signal-1.1.3/bohmanwin.m
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+## Copyright (C) 2007 Sylvain Pelissier <sylvain.pelissier@gmail.com>
+##
+## 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{w}] =} bohmanwin(@var{L})
+## Compute the Bohman window of lenght L.
+## @seealso{rectwin,  bartlett}
+## @end deftypefn
+
+function [w] = bohmanwin(L)
+  if (nargin < 1)
+    print_usage
+  elseif(! isscalar(L))
+    error("L must be a number");
+  elseif(L < 0)
+    error('L must be positive');
+  end
+
+  if(L ~= floor(L))
+    L = round(L);
+    warning('L rounded to the nearest integer.');
+  end
+
+  if(L == 0)
+    w = [];
+
+  elseif(L == 1)
+    w = 1;
+
+  else
+    N = L-1;
+    n = -N/2:N/2;
+
+    w = (1-2.*abs(n)./N).*cos(2.*pi.*abs(n)./N) + (1./pi).*sin(2.*pi.*abs(n)./N);
+    w(1) = 0;
+    w(length(w))=0;
+    w = w';
+  end
+endfunction