lans_killnan.m

模式识别工具包

%	lans_killnan	- Replace NaN entries by specified number
%
%	[omat]	= lans_killnan(imat[,rep])
%
%	_____OUTPUTS____________________________________________________________
%	omat	input matrix with some NaNs			(real matrix)
%
%	_____INPUTS_____________________________________________________________
%	imat	input matrix with some NaNs			(real matrix)
%	rep	replacement number (default 0)			(scalar)
%
%	_____NOTES______________________________________________________________
%	useful for MATLAB functions such as interp2 which gives NaN
%
%	(C) 1999.03.11 Kui-yu Chang
%	http://lans.ece.utexas.edu/~kuiyu

%	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 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, write to the Free Software
%	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
%	or check
%			http://www.gnu.org/

function	[omat]	= lans_killnan(imat,rep)

if nargin<2
	rep	= 0;
end

omat	= imat;
nonzeros= find(imat~=0);		% indices of nonzero terms
nanmask	= imat(nonzeros)-imat(nonzeros);% whats left are NaN
wherenan= find(nanmask~=0);		% find the NaN's
omat(nonzeros(wherenan))	= ones(size(wherenan))*rep;