[FieldTrip] Just a small question about resegmenting epoched data...

catia barbosa catia_barbosa at live.fr
Mon Mar 2 09:29:15 CET 2015


I'll start
by thanking you for spending your time trying to answer my question. I'm having
some trouble with my script. I have filter and do my ICA rejection in my
epoched data already. But know I'm thinking, that it would be more interesting
and efficient to do it in a more segmented data. But I don't want to waste time
redoing all the preprocessing all over again. So I resegmented the already
epoched data in many subepochs. Even so I'm not satisfied, I would like to know
if there is a simple and elegant way of doing it in fieldtrip, better than mine
(here above): 

SOA = 390;

BL = 500;

sr = 678.17;


SOA = round(SOA*sr/1000);

BL = round(BL*sr/1000);


adjust_sample=[0 1 1 2 2 3 3 4 4 5 5 6 6]; %adjusting for rounding SOA


%constructing begsample and endsample


beg_begspl = BL;

end_begspl = SOA*12 + BL;

begsample = [beg_begspl:SOA:end_begspl];



beg_endspl = SOA*4 + BL;

end_endspl = SOA*16 + BL;

endsample = [beg_endspl:SOA:end_endspl];

endsample = endsample + adjust_sample;


cte = (endsample(1)- begsample(1))/2;


%creating new epochs


cfg = [];

cfg.begsample = begsample(1);

cfg.endsample = endsample(1);

tmp_data1= ft_redefinetrial(cfg, data);

cfg = [];

cfg.offset = [-(0*SOA)-(cte)];  

tmp_data1 = ft_redefinetrial(cfg, tmp_data1);




cfg = [];

cfg.begsample = begsample(13);

cfg.endsample = endsample(13);

tmp_data13= ft_redefinetrial(cfg, data);

cfg = [];

cfg.offset = [-(12*SOA)-(cte)];  

tmp_data13 = ft_redefinetrial(cfg, tmp_data13);


%concatenating data


cfg = [];

tmp_data = ft_appenddata(cfg, tmp_data1, tmp_data2, tmp_data3,
tmp_data4, tmp_data5, tmp_data6, tmp_data7, tmp_data8, tmp_data9 , tmp_data10, tmp_data11,
tmp_data12, tmp_data13);


Once again, thank you


Barbosa Catia

INSERM U 1106 /Institut de neurosciences des
systèmes (FRANCE) 		 	   		  
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