[FieldTrip] ICA error "the component unmixing failed"

[Silvia Formica]

Hi all,

this is probably a fairly basic question.

I'm trying to run an ICA on my epoched data, but I come across an error that I don't understand. Note that in the past I already succeded in running an ICA on the same dataset, so I really can't understand what is changed.?

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Here the error I am getting:


scaling data with 1 over 86.290718

concatenating data.......................................................................................................
concatenated data matrix size 64x590112
starting decomposition using runica
runica(): unknown flagError using ft_notification (line 340)
the component unmixing failed

Error in ft_error (line 39)
  ft_notification(varargin{:});

Error in ft_componentanalysis (line 800)
  ft_error('the component unmixing failed');


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The error shows up immediately, the convergence process doesn't even start.

The dataset is made of 288 epochs, 4 seconds long with a sampling rate of 1024 Hz. I'm running the ICA with the following parameters:


cfg        = [];
cfg.layout= 'biosemi64.lay';
cfg.method = 'runica';
cfg.channel = 1:64;
comp_cue= ft_componentanalysis(cfg, data_cue);


Thanks for any help!

Best,
Silvia




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