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ConvertLocations.m
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% function ConvertLocations ( ReadFileName, WriteFileName, eegLabels )
%
% This routine converts between *.ced and *.locs (EEGlab) and *.csd (CSD
% toolbox) electrode location ASCII text files by rotating the spherical
% angle theta +90 or -90 degrees.
%
% Usage: function ConvertLocations ( ReadFileName, WriteFileName, eegLabels );
%
% Input arguments: ReadFileName ASCII montage file name(s) with ...
% WriteFileName ... one of the following extensions:
% *.csd (CSD toolbox spherical, 3-D Cartesian)
% *.ced (EEGlab polar, 3-D Cartesian, spherical)
% *.locs (EEGlab polar)
% *.xyz (3-D Cartesian)
% *.txt (write only: 3-D Cartesian exponent format,
% skip labels and comments)
% eegLabels cell string array with channel labels
%
% Note: 1) Entering only <ReadFileName> will default the conversion to
% *.ced for *.csd files, or to *.csd for *.ced and *.locs files
% 2) Entering only an extension for <WriteFileName> will
% substitute the extension of <ReadFileName> as output file
% 3) Specifying a cell string array <eegLabels> will reorder and
% convert only those locations included in this list
%
% Copyright (C) 2009 by Jürgen Kayser (Email: [email protected])
% GNU General Public License (http://www.gnu.org/licenses/gpl.txt)
% Updated: $Date: 2009/05/19 11:55:00 $ $Author: jk $
% - convert between *.csd, *.ced and *.locs formats
% Added: $Date: 2009/05/21 13:24:00 $ $Author: jk $
% - input argument <eegLabels> to selectively convert/reorder locations
% Added: $Date: 2009/07/30 10:52:00 $ $Author: jk $
% - convert 3-D Cartesian locations *.xyz format
% Added: $Date: 2010/04/11 19:38:00 $ $Author: jk $
% - convert 3-D Cartesian locations *.txt format
%
function ConvertLocations ( ReadFileName, WriteFileName, eegLabels )
if nargin < 1
help ConvertLocations
disp('*** Error: Specify a montage file');
return
end
disp(sprintf('Reading: %s',ReadFileName));
period = find(ReadFileName == '.');
ReadExt = ReadFileName(period(end)+1:end);
FileName = ReadFileName(1:period);
switch ReadExt
case 'csd'
[lab,theta,phi] = textread(ReadFileName, '%s%f%f%*[^\n]','commentstyle','c++');
case 'ced'
[Number,lab,th,radius,X,Y,Z,sph_theta,sph_phi,sph_radius] = ...
textread(ReadFileName, '%n%s%f%f%f%f%f%f%f%f%*[^\n]','headerlines',1);
theta = sph_theta + 90; % rotate theta +90 degrees
if theta > 180
theta = theta - 360; end; % adjust theta if neccessary
phi = sph_phi;
case 'locs'
[Number,th,radius,lab] = textread(ReadFileName, '%n%f%f%s%*[^\n]');
theta = -th + 90;
if theta > 180
theta = theta - 360; end; % adjust theta if neccessary
phi = 90 - (radius * 180);
case 'xyz'
[lab,X,Y,Z] = textread(ReadFileName, '%s%f%f%f%*[^\n]','commentstyle','c++');
[ThetaRad,PhiRad] = cart2sph(X,Y,Z);
theta = ThetaRad * 180 / pi;
phi = PhiRad * 180 / pi;
nElec = size(X,1);
for n = 1:nElec
z = X(n).^2 + Y(n).^2 + Z(n).^2 - 1; % calculate off sphere surface
disp(sprintf('%8s%10.4f%10.4f%10.4f%22.17f', ...
char(lab(n,:)),X(n),Y(n),Z(n),z));
end;
otherwise
help ConvertLocations
disp(sprintf('*** Error: File extension (%s) not recognized',ReadExt));
return
end;
if nargin < 2
switch ReadExt
case 'csd'
WriteExt = 'ced';
case {'ced' 'locs'}
WriteExt = 'csd';
end
WriteFileName = strcat(FileName,WriteExt);
else
period = find(WriteFileName == '.');
if size(period,2) == 0
WriteExt = WriteFileName;
else
WriteExt = WriteFileName(period(end)+1:end);
end
if (size(WriteFileName,1) == 0) | (size(period,2) == 0)
WriteFileName = strcat(FileName,WriteExt);
end
end
if nargin < 3
nLab = 0;
else
nLab = length(eegLabels);
n = 0;
theta0 = theta;
phi0 = phi;
lab0 = lab;
for e = 1:nLab
ok = 0;
for f = 1:length(lab)
if strcmp(upper(char(eegLabels(e,:))),upper(lab(f,:)))
n = n + 1;
theta0(e) = theta(f);
phi0(e) = phi(f);
lab0(e,:) = eegLabels(e,:);
ok = 1;
break
end
end
if ~ ok
disp(sprintf('*** Error: Label %s undefined in %s',...
char(eegLabels(e,:)),ReadFileName));
lab0(e,:) = eegLabels(e,:);
theta0(e) = NaN;
phi0(e) = NaN;
end
end
if ~(n == nLab)
help ConvertLocations
disp(sprintf('*** Error: %d assigned <> %d read EEG channel labels',n,nLab));
return
end;
theta = theta0(1:length(eegLabels));
phi = phi0(1:length(eegLabels));
lab = lab0(1:length(eegLabels),:);
end;
sph_theta = theta - 90; % rotate theta -90 degrees
if sph_theta < -180;
sph_theta = sph_theta + 360; end; % adjust theta if neccessary
sph_phi = phi;
th = -sph_theta;
radius = (90 - phi) / 180;
switch WriteExt
case 'ced' % reassign spherical angles ...
theta = sph_theta; % .. for X,Y,Z coordinates
phi = sph_phi;
end
ThetaRad = pi / 180 * theta; % convert Theta and Phi to radians ...
PhiRad = pi / 180 * phi; % ... and Cartesian coordinates ...
[X,Y,Z] = sph2cart(ThetaRad,PhiRad,1); % ... for optimal resolution
nElec = size(theta,1); % determine size of output EEG montage
disp(sprintf('Writing: %s',WriteFileName));
fid = fopen(WriteFileName,'w'); % open output file for write
switch WriteExt % write optional header comments
case 'csd'
fprintf(fid,'%s%31s%30s\n', ...
'// MatLab','Sphere coordinates [degrees]','Cartesian coordinates');
fprintf(fid,'%s%12s%10s%10s%10s%10s%10s%25s\n', ...
'// Label','Theta','Phi','Radius','X','Y','Z','off sphere surface');
disp(sprintf('%5s %7s %10s %10s','#','Label','Theta','Phi'));
case 'ced'
fprintf(fid,'%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\n', ...
'Number','labels','theta','radius','X','Y','Z','sph_theta','sph_phi','sph_radius');
disp(sprintf('%5s %7s %10s %10s','#','Label','Sph_Theta','Sph_Phi'));
case 'locs'
disp(sprintf('%5s %7s %10s %10s','#','Label','Th(eta)','Radius'));
case 'xyz'
fprintf(fid,'%s%10s%10s%10s\n', ...
'// Label','X','Y','Z');
disp(sprintf('%5d %7s %10s %10s %10s','#','Label','X','Y','Z'));
end
for n = 1:nElec
switch WriteExt
case 'csd'
z = X(n).^2 + Y(n).^2 + Z(n).^2 - 1; % calculate off sphere surface
fprintf(fid,'%8s%12.3f%12.3f%12.3f%10.4f%10.4f%10.4f%22.17f\n', ...
char(lab(n,:)),theta(n),phi(n),1.0,X(n),Y(n),Z(n),z);
disp(sprintf('%5d %7s %10.3f %10.3f',n,char(lab(n,:)),theta(n),phi(n)));
case 'ced'
fprintf(fid,'%d\t%s\t%.3g\t%.3g\t%.3g\t%.3g\t%.3g\t%.3g\t%.3g\t%.3g\n', ...
n,char(lab(n,:)),th(n),radius(n),X(n),Y(n),Z(n),sph_theta(n),sph_phi(n),1);
disp(sprintf('%5d %7s %10.3f %10.3f',n,char(lab(n,:)),sph_theta(n),sph_phi(n)));
case 'locs'
fprintf(fid,'%d\t%.5g\t%.5g\t%s\n', ...
n,th(n),radius(n),char(lab(n,:)));
disp(sprintf('%5d %7s %10.3f %10.5f',n,char(lab(n,:)),th(n),radius(n)));
case 'xyz'
fprintf(fid,'%8s%10.4f%10.4f%10.4f\n', ...
char(lab(n,:)),X(n),Y(n),Z(n));
disp(sprintf('%5d %7s %10.4f %10.4f %10.4f',n,char(lab(n,:)),X(n),Y(n),Z(n)));
case 'txt'
fprintf(fid,'%16E %16E %16E\n',X(n),Y(n),Z(n));
disp(sprintf('%5d %7s %16E %16E %16E',n,char(lab(n,:)),X(n),Y(n),Z(n)));
end
end
fclose(fid); % close output file
disp(sprintf('Montage: %d locations converted',nElec));
return