[FieldTrip] ft_combineplanar after ft_channelrepair

victoria schroeder vic.schroeder2 at gmail.com
Mon Mar 7 21:47:07 CET 2016


Hey Fieldtrip users,

I am working with neuromag data 306 channels. I would like to interpolate
channels using ft_channelrepair. Afterwards it would be good to combine the
gradiometers to create planar gradients. However, unfortunately i get an
error message when trying to use ft_combineplanar when i have used
ft_channelrepair. Without using ft_channelrepair things work well. Can
these two functions not be used on the same data? (See the code and the
error message below)

Thank you a lot
Victoria

%prepare neighbours
cfg_neighb = [];
cfg_neighb.feedback = 'yes';
cfg_neighb.method = 'triangulation';
cfg_neighb.layout = 'neuromag306all.lay';
neighbours = ft_prepare_neighbours(cfg_neighb, dat_orig);

% Interpolate and put into new data structure
cfg = [];
cfg.badchannel = {  'MEG1122', 'MEG1312','MEG1411'};
cfg.layout = 'neuromag306all.lay';
cfg.method = 'nearest';
cfg.neighbours = neighbours;
Chan_clean = ft_channelrepair(cfg,data_orig);

data=Chan_clean;
%time frequency analysis
cfg = [];
cfg.output       = 'pow';
cfg.channel      = 'MEGGRAD';
cfg.method       = 'mtmconvol';
cfg.taper        = 'hanning';
cfg.foi          = [2:2:30];
cfg.toi          = [-1.3:0.05:1];
cfg.t_ftimwin    = ones(length(cfg.foi),1).*0.5;
cfg.keeptrials   = 'yes';
cfg.trials = find(data.trialinfo(:,1) == 64 | data.trialinfo(:,1) == 128);
freq = ft_freqanalysis(cfg, data);

%time frequency baselined
cfg=[];
cfg.baseline     = [-0.5 0];
cfg.baselinetype = 'absolute';
Base = ft_freqbaseline(cfg, freq);

%Combine planar
Comb  = ft_combineplanar([],Base);


Error!
Reference to non-existent field 'chanori'.

Error in ft_combineplanar (line 293)
  newgrad.chanori  = data.grad.chanori(sel,:);
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