Frequency Analysis!

[Jan Mathijs Schoffelen]

Dear Muthuraman,

For the mtmwelch-method, the same caveats apply as to the mtmconvol-method.
If you specify your window to be one second, and your data is also one
second (perhaps even one sample less? Did you check this, a lonely sample is
easily lost), then there is nothing to welch (because your data can be only
split up in one overlapping segment of one second, or even cannot be split
up at all, dependent on your data: see above).

In the following link you find some info how to create fieldtrippish
data-objects in matlab:

http://www2.ru.nl/fcdonders/fieldtrip/doku.php?id=fieldtrip:documentation:da
taformats

You can read in your laplacian transformed data into matlab and create a
data-structure (some hints are given in the link).

Yours,

Jan-Mathijs

-----Original Message-----
From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
Of Muthuraman Muthuraman
Sent: Friday, February 09, 2007 1:06 PM
To: FIELDTRIP at NIC.SURFNET.NL
Subject: [FIELDTRIP] Frequency Analysis!

Hello ,

Thankyou JM, for the suggestions regarding the Time-Frequency Analysis, it
works well now. I need the time information inorder to see what happens to
the power at a specific time interval.

>>From the previous discussion for the Freqanalysis_mtmwelch method as
Prof.Robert as suggested i tried to change the frequency resolution to 1 Hz
in the Mtmwelch method. Now i get all the values to be Nan's.

cfg.foi        = [2:1:30];
cfg.t_ftimwin  = ones(1,length(cfg.foi)).*1;

And also is there way to load the Laplacian transformed data to the Fieldtip

analysis which is a .mat file and work on it for the coherence analysis. I
do the laplacian transformation and the welch periodogram method with my own

programs not any software.

With regards
M.Muthuraman.

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