[FieldTrip] What is the data present in the covariance matrix after using ft_timelockanalysis
Soujata Borbaruah
s.borbaruah at student.utwente.nl
Thu Jun 16 16:19:12 CEST 2016
Hello,
I want to calculate the covariance of the data I provide. In the function ft_timelockanalysis there is a portion where the covariance is being normalised over all trials by the total number of samples in all trials.
% normalize the covariance over all trials by the total number of samples in all trials
if strcmp(cfg.covariance, 'yes')
if strcmp(cfg.keeptrials,'yes')
for i=1:ntrial
if strcmp(cfg.removemean, 'yes')
covsig(i,:,:) = covsig(i,:,:) / (numcovsigsamples(i)-1);
else
covsig(i,:,:) = covsig(i,:,:) / numcovsigsamples(i);
end
end
else
if strcmp(cfg.removemean, 'yes')
covsig = squeeze(nansum(covsig, 1)) / (sum(numcovsigsamples)-ntrial);
else
covsig = squeeze(nansum(covsig, 1)) / sum(numcovsigsamples);
end
end
end
Please note that the cfg.removemean was selected as yes.
Can someone please explain what is the final data present in my covariance matrix?
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