File size: 2,155 Bytes
03a0748 |
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 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 |
function [distmatrixpol distmatrixxyz distmatrixproj] = distancematrix(EEG,eeg_chans)
% Copyright (C) 2010 Hugh Nolan, Robert Whelan and Richard Reilly, Trinity College Dublin,
% Ireland
% nolanhu@tcd.ie, robert.whelan@tcd.ie
%
% 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
num_chans = size(EEG.data,1);
distmatrix = zeros(length(eeg_chans),length(eeg_chans));
distmatrixpol = [];
for chan2tst = eeg_chans;
for q=eeg_chans
distmatrixpol(chan2tst,q)=sqrt(((EEG.chanlocs(chan2tst).radius^2)+(EEG.chanlocs(q).radius^2))-(2*((EEG.chanlocs(chan2tst).radius)*...
(EEG.chanlocs(q).radius)*cosd(EEG.chanlocs(chan2tst).theta - EEG.chanlocs(q).theta))));%calculates the distance between electrodes using polar format
end
end
locs = EEG.chanlocs;
for u = eeg_chans
if ~isempty(locs(u).X)
Xs(u) = locs(u).X;
else
Xs(u) = 0;
end
if ~isempty(locs(u).Y)
Ys(u) = locs(u).Y;
else
Ys(u) = 0;
end
if ~isempty(locs(u).Z)
Zs(u) = locs(u).Z;
else
Zs(u) = 0;
end
end
Xs = round2(Xs,6);
Ys = round2(Ys,6);
Zs = round2(Zs,6);
for u = eeg_chans
for v=eeg_chans
distmatrixxyz(u,v) = dist(Xs(u),Xs(v))+dist(Ys(u),Ys(v))+dist(Zs(u),Zs(v));
end
end
D = max(max(distmatrixxyz));
distmatrixproj = (pi-2*(acos(distmatrixxyz./D))).*(D./2);
function d = dist(in1,in2)
d = sqrt(abs(in1.^2 - in2.^2));
end
function num = round2(num,decimal)
num = num .* 10^decimal;
num = round(num);
num = num ./ 10^decimal;
end
end
|