[Octave-cvsupdate] SF.net SVN: octave: [5131] trunk/octave-forge/main/signal/inst/wkeep.m

[<si...@us...>]

Revision: 5131
          http://octave.svn.sourceforge.net/octave/?rev=5131&view=rev
Author:   sis-sou
Date:     2008-06-21 02:02:38 -0700 (Sat, 21 Jun 2008)

Log Message:
-----------
Initial commit into SVN.

Added Paths:
-----------
    trunk/octave-forge/main/signal/inst/wkeep.m

Added: trunk/octave-forge/main/signal/inst/wkeep.m
===================================================================
--- trunk/octave-forge/main/signal/inst/wkeep.m	                        (rev 0)
+++ trunk/octave-forge/main/signal/inst/wkeep.m	2008-06-21 09:02:38 UTC (rev 5131)
@@ -0,0 +1,72 @@
+## Copyright (C) 2008   Sylvain Pelissier   <syl...@gm...>
+##
+## 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 
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {[@var{y}] =} wkeep(@var{x,l,opt})
+##	Extract the elements of x of size l from the center, the right or the left.
+## @end deftypefn
+
+
+function y = wkeep(x,l,opt)
+
+	if (nargin < 2|| nargin > 3); usage("\nwkeep(x,l)\nwkeep(x,l,opt)\n"); end
+	if(nargin==2)
+		opt='c';
+	end
+	if(isvector(x))
+		if(nargin==2)
+			opt='c';
+		end
+		
+		if(l > length(x))
+			error('l must be or equal the size of x');
+		end
+		
+		if(opt=='c')
+			s = (length(x)-l)./2;
+			y = x(1+floor(s):end-ceil(s));
+	
+		elseif(opt=='l')
+			y=x(1:l);
+	
+		elseif(opt=='r')
+			y = x(end-l+1:end);
+		
+		else
+			error('opt must be equal to c, l or r');
+		end
+	else
+		if(length(l) == 2)
+			s1 = (length(x)-l(1))./2;
+			s2 = (length(x)-l(2))./2;
+		else
+			error('For a matrix l must be a 1x2 vector');
+		end
+		
+		if(nargin==2)
+			y = x(1+floor(s1):end-ceil(s1),1+floor(s2):end-ceil(s2));
+		else
+			if(length(opt) == 2)
+				firstr=opt(1);
+				firstc=opt(2);
+			else
+				error('For a matrix l must be a 1x2 vector');
+			end
+			
+			y=x(firstr:firstr+l(1)-1,firstc:firstc+l(2)-1);
+		end
+		
+		
+	end
\ No newline at end of file


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