From: Francois Auger <address@hidden>
To: Hallgrímur Th.Björnsson<address@hidden>, <address@hidden>
Subject: Re: [Tftb-help] finding the energy in a certain time andfrequency
interval in a TF plot
Date: Mon, 14 May 2007 00:31:03 +0200
Dear Hallgrímur,
In a TFR matrix, the time is in columns, and the frequency bins are in
lines
(The first line is the zero frequency (DC), and the last one is the highest
(one half of the sampling frequency).
Best regards,
To select the area between the 10th and the 50th time sample, and the
frequency between the 60th and the 80th frequency bin, use
TFR(10:50,60:80)
By the way, where on earth are you living ?
best regards,
At 22:50 09/05/2007, Hallgrímur Th. Björnsson wrote:
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Hi.
I am using the Time Frequency Toolbox in Matlab for my Masters thesis. It
is working very well and I have been using the Choi Williams Distribution
to great effect working on EEG signals.
What I like to do is to find the total energy in a certain part of the
plot (for ex. All energy in 10-12 Hz from time 0 to 1 sec).
I have been trying to use integ2d.m to do this, but what confuses me is
how I interact with the TFR variable returned from tfrcw. How do I only
select a subspace of TFR?
Thanks.
Francois Auger, http://www.univ-nantes.fr/auger-f
Chef du departement Mesures Physiques de l'IUT de Saint-Nazaire
tel : 02 40 17 81 21, internet : http://www.univ-nantes.fr/iutsn/mp
Laboratoire Ireena, Crtt, bureau 272
tel : 02 40 17 26 35, internet : http://www.polytech.univ-nantes.fr/ireena
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