[FieldTrip] Empty array in coherence connectivity analysis
Rosa Taylor Beale
TaylorBealeR at cardiff.ac.uk
Fri Mar 30 17:40:26 CEST 2018
Hi all,
I'm a final year undergraduate in Cardiff working on pain networks.
I have been trying to calculate coherence between 3 seed regions, however when I run the ft_connectivityanalysis, the labelcmb and cohspctrm arrays are empty (the channel labels don't look like they were read?). There is no error or warning messages that occur when running the command, so I am unsure why it is not running correctly.
First, I run ft_freqanalysis which seems to run fine:
cfg = []
cfg.method = 'wavelet';
cfg.output = 'pow';
cfg.toi = 0:0.05:2;
cfg.foi = [30:1:100];
time_freq= ft_freqanalysis(cfg, virtualchannel_raw);
time_freq =
label: {3x1 cell}
dimord: 'chan_freq_time'
freq: [1x71 double]
time: [1x41 double]
powspctrm: [3x71x41 double]
cfg: [1x1 struct]
Then I run the connectivity analysis and up with the empty output:
cfg = [];
cfg.method = 'coh';
cfg.channelcmb = {'pfcCont_seed' 'smc_seed'
'pfcIps_seed' 'smc_seed'
'pfcCont_seed' 'pfcIps_seed'};
coherence = ft_connectivityanalysis(cfg, time_freq);
coherence =
labelcmb: {0x2 cell}
dimord: 'chancmb_freq_time'
cohspctrm: [0x71x41 double]
time: [1x41 double]
freq: [1x71 double]
cfg: [1x1 struct]
>> coherence.labelcmb
ans =
Empty cell array: 0-by-2
>> coherence.cohspctrm
ans =
Empty array: 0-by-71-by-41
I have tried with fieldtrip versions 20161011 and 20171015 on matlab r2015a.
I've shown this to various people much more experienced at fieldtrip than I and we've all been a bit stumped!
Any ideas?
Many thanks
Rosa Taylor Beale
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