Homec4science
Diffusion iCAPs public (master) Browse

iCAPs/packages/spm12/external/mne/fiff_transform_eeg_chs.m
2cb18aae5832master

Last Change
Raw File

fiff_transform_eeg_chs.m
View Options

function [res, count] = fiff_transform_eeg_chs(chs,trans)
%
% [res, count] = fiff_transform_eeg_chs(chs,trans)
%
% Move to another coordinate system in EEG channel channel info
% Count gives the number of channels transformed
%
% NOTE: Only the eeg_loc field is modified by this routine, not
% loc which remains to reflect the original data read from the fif file
%
%
%
% Author : Matti Hamalainen, MGH Martinos Center
% License : BSD 3-clause
%
%
% Revision 1.7 2008/11/17 21:45:56 msh
% Fixed error in transforming the EEG location data to another coordinate frame
%
% Revision 1.6 2006/05/03 18:53:05 msh
% Approaching Matlab 6.5 backward compatibility
%
% Revision 1.5 2006/04/23 15:29:40 msh
% Added MGH to the copyright
%
% Revision 1.4 2006/04/21 17:31:07 msh
% Added the examples.
% Modified the formatting of some informative output.
%
% Revision 1.3 2006/04/18 20:44:46 msh
% Added reading of forward solution.
% Use length instead of size when appropriate
%
% Revision 1.2 2006/04/17 15:01:34 msh
% More small improvements.
%
% Revision 1.1 2006/04/17 11:52:15 msh
% Added coil definition stuff
%
%
me='MNE:fiff_transform_eeg_chs';
global FIFF;
if isempty(FIFF)
FIFF = fiff_define_constants();
end
if nargin ~= 2
error(me,'Wrong number of arguments');
end
res = chs;
if isempty(trans)
return;
end
count=0;
%
% Output unaugmented vectors from the transformation
%
t = trans.trans(1:3,:);
for k = 1:length(res)
if res(k).kind == FIFF.FIFFV_EEG_CH
if res(k).coord_frame == trans.from && ~isempty(res(k).eeg_loc)
%
% Transform the augmented EEG location vectors
%
for p = 1:size(res(k).eeg_loc,2)
res(k).eeg_loc(:,p) = t*[ res(k).eeg_loc(:,p) ; 1 ];
end
count = count + 1;
res(k).coord_frame = trans.to;
end
end
end
if count > 0
fprintf(1,'\t%d EEG electrode locations transformed\n',count);
end
return;
end
c4science · Help