Questions on freqanalysis

[gao zai]

Dear all,

I am now trying to do the frequencyanalysis in Fieldtrip. Since the data is
analyzed in EEGlab before, thus I first convert the data from EEGlab to
Fieldtrip using eeglab2fieldtrip: *data = eeglab2fieldtrip(EEG,
'preprocessing' )*. The data was epoched from -200 ms to 1400ms time-locked
to the onset of the stimuli.

Then I run the following scripts:

cfg              = [];
cfg.output       = 'pow';
cfg.method       = 'mtmconvol';
cfg.taper        = 'hanning';
cfg.foi          = 5:1:30;
cfg.t_ftimwin    = 7./cfg.foi;  % 7 cycles per time window
cfg.toi          = -0.15:0.05:1.35; % to reduce boundary effects
TFRhann = freqanalysis(cfg, data);

However, part of the result in TFRhann.*powspctrm* is *NaN*. And I didn't
see any problem in the parameters I use. I wonder whether someone can give
me some suggestions to fix it? Many thanks.

Best,
Feng

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