Request for clarrification

rathinaswamy bavanandan govindan rbg26471 at YAHOO.COM
Sun Jul 17 20:41:49 CEST 2005


Hi,
Greetings!
I am novice to fieldtrip! I am interested in time
frequency analysis of MEG data. Before applying the
software to my data I started with the Tutorial. I am
using version fieldtrip-0.9.6. I just followed the
commands 'Reading the data' in tutorial. I used
Subject01.ds as test case. I could able to preprocess
the data and save the data in dataFIC. Then I followed
calculating the time-frequency representation (TFR)
using multitapers!

cfg.output='pow';
cfg.sgn='all';
cfg.method='convol';
cfg.foi=15:30;
cfg.t_ftimwin=round(dataFIC.fsample.*3./cfg.foi)./dataFIC.fsample;
cfg.t_ftimwin=round(dataFIC.fsample.*3./cfg.foi)./dataFIC.fsample;
cfg.tapsmofrq=round(cfg.foi./5);
cfg.toi=-1:0.01:1.5;
cfg.pad=3;
cfg.keeptrials='no';
cfg.keeptapers='no';
TFRmult=freqanalysis(cfg,dataFIC);

I got the following error message!

??? Error using ==> freqanalysis_mtmconvol
15.000 Hz : datalength to short for specified
smoothing
datalength: 0.200 s, smoothing: 3.000 Hz, minimum
smoothing: 5.000 Hz

Error in ==> freqanalysis at 176
eval(sprintf('freq =
freqanalysis_%s(cfg,data);',lower(cfg.method)));

Error in ==> check at 12
TFRmult=freqanalysis(cfg,dataFIC);



It would be nice if someone could give input on this!

Thanks for attention!

Best regards
Govindan

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