[FieldTrip] induced activity

[Nenad Polomac]

Hi,

I would like to calculate induced time frequency activity for my MEG data.
I plan to do it as follows. First I calculate total time-frequency for
every single trial. Second, I calculate evoked activity with
ft_freqanalysis for the averaged ERF. Then I subtract evoked activity from
every trial total activity. And finally I average these differences. I
believe this is correct way...

My problem is how to subtract evoked.powspctrm(3-D matrix) from
total.powspctrm(4-D matrix).

Thank you in advance!

Nenad
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