/usr/share/octave/packages/3.2/nan-2.4.4/nanconv2.m is in octave-nan 2.4.4-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | function [C,N,c] = conv2nan(X,Y,arg3)
% CONV2 2-dimensional convolution
% X and Y can contain missing values encoded with NaN.
% NaN's are skipped, NaN do not result in a NaN output.
% The output gives NaN only if there are insufficient input data
%
% [...] = CONV2NAN(X,Y);
% calculates 2-dim convolution between X and Y
% [C] = CONV2NAN(X,Y);
% This function is part of the NaN-toolbox
% http://pub.ist.ac.at/~schloegl/matlab/NaN/
% $Id: nanconv2.m 8223 2011-04-20 09:16:06Z schloegl $
% Copyright (C) 2000-2005,2010 by Alois Schloegl <alois.schloegl@gmail.com>
% This function is part of the NaN-toolbox
% http://pub.ist.ac.at/~schloegl/matlab/NaN/
% 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, see <http://www.gnu.org/licenses/>.
if nargin~=2,
fprintf(2,'Error CONV2NAN: incorrect number of input arguments\n');
end;
m = isnan(X);
n = isnan(Y);
X(m) = 0;
Y(n) = 0;
C = conv2(X,Y); % 2-dim convolution
N = conv2(real(~m),real(~n)); % normalization term
c = conv2(ones(size(X)),ones(size(Y))); % correction of normalization
if nargout==1,
C = C.*c./N;
elseif nargout==2,
N = N./c;
end;
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