[FieldTrip] using ft_definetrial

Nikola Valchev nikola.valchev.umcg at gmail.com
Mon Jul 13 18:10:28 CEST 2015

Dear experts, 

I get a strange error when attempting to define the trials in my data. I
preprocess my data first and then I call ft_definetrial with the option:


cfg.trialdef.eventtype  = '?';


This way I see that my trigger file is read successfully: 


evaluating trialfunction 'ft_trialfun_general'

reading the events from 'C:\eeg_anita\data\S14\s14_CI_1.cnt'

the following events were found in the datafile

event type: 'trigger' with event values: '1' '3' '6' '9' 

no trials have been defined yet, see FT_DEFINETRIAL for further help

found 180 events

created 0 trials

the call to "ft_definetrial" took 1 seconds


But then when I change the setting to: 


cfg.trialfun                = 'ft_trialfun_general';

cfg.trialdef.eventvalue     = {'1'}; 

cfg.trialdef.prestim        = .2; 

cfg.trialdef.poststim       = 6; 

cfg = ft_definetrial(cfg);


I get the error: 

                ??? Error using ==> ft_definetrial at 184

No trials were defined, see FT_DEFINETRIAL for help. 


Anyone has an idea how to solve this?





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