1 function [C,N,c] = nanconv(X,Y,arg3)
2 % NANCONV computes the convolution for data with missing values.
3 % X and Y can contain missing values encoded with NaN.
4 % NaN's are skipped, NaN do not result in a NaN output.
5 % The output gives NaN only if there are insufficient input data
7 % [...] = NANCONV(X,Y);
8 % calculates 2-dim convolution between X and Y
11 % WARNING: missing values can introduce aliasing - causing unintended results.
12 % Moreover, the behavior of bandpass and highpass filters in case of missing values
13 % is not fully understood, and might contain some pitfalls.
15 % see also: CONV, NANCONV2, NANFFT, NANFILTER
17 % $Id: conv2nan.m 6973 2010-02-28 20:19:12Z schloegl $
18 % Copyright (C) 2000-2005,2010,2011 by Alois Schloegl <alois.schloegl@gmail.com>
19 % This function is part of the NaN-toolbox
20 % http://pub.ist.ac.at/~schloegl/matlab/NaN/ and
21 % http://octave.svn.sourceforge.net/viewvc/octave/trunk/octave-forge/extra/NaN/inst/
23 % This program is free software; you can redistribute it and/or modify
24 % it under the terms of the GNU General Public License as published by
25 % the Free Software Foundation; either version 3 of the License, or
26 % (at your option) any later version.
28 % This program is distributed in the hope that it will be useful,
29 % but WITHOUT ANY WARRANTY; without even the implied warranty of
30 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
31 % GNU General Public License for more details.
33 % You should have received a copy of the GNU General Public License
34 % along with this program; If not, see <http://www.gnu.org/licenses/>.
37 warning('NANCONV is experimental. For more details see HELP NANCONV');
41 fprintf(2,'Error NANCONV2: incorrect number of input arguments\n');
50 C = conv(X,Y); % 2-dim convolution
51 N = conv(real(~m),real(~n)); % normalization term
52 c = conv(ones(size(X)),ones(size(Y))); % correction of normalization