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iCAPs/packages/spm12/external/mne/fiff_transform_meg_chs.m
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fiff_transform_meg_chs.m
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function [res, count] = fiff_transform_meg_chs(chs,trans)
%
% [res, count] = fiff_transform_meg_chs(chs,trans)
%
% Move to another coordinate system in MEG channel channel info
% Count gives the number of channels transformed
%
% NOTE: Only the coil_trans 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 2006/05/03 19:09:03 msh
% Fixed even more compatibility issues.
%
% Revision 1.6 2006/04/23 15:29:40 msh
% Added MGH to the copyright
%
% Revision 1.5 2006/04/21 17:31:07 msh
% Added the examples.
% Modified the formatting of some informative output.
%
% Revision 1.4 2006/04/18 20:44:46 msh
% Added reading of forward solution.
% Use length instead of size when appropriate
%
% Revision 1.3 2006/04/17 15:01:34 msh
% More small improvements.
%
% Revision 1.2 2006/04/17 11:52:15 msh
% Added coil definition stuff
%
% Revision 1.1 2006/04/13 22:37:03 msh
% Added head_head_trans field to info.
%
% Revision 1.1 2006/04/13 21:20:06 msh
% Added new routines for the channel information transformation.
%
%
me='MNE:fiff_transform_meg_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;
t = trans.trans;
for k = 1:length(res)
if res(k).kind == FIFF.FIFFV_MEG_CH || res(k).kind == FIFF.FIFFV_REF_MEG_CH
if res(k).coord_frame == trans.from && ~isempty(res(k).coil_trans)
res(k).coil_trans = t*res(k).coil_trans;
res(k).coord_frame = trans.to;
count = count + 1;
end
end
end
if count > 0
fprintf(1,'\t%d MEG channel locations transformed\n',count);
end
return;
end
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