how can we take the seperate energy component in wenergy?

Hi friends......

i am calculating energy of EEG signal.

i took a single channel of EEG. i used wpdec to decompose into delta, theta, alpha, beta and gamma.

Now i want to calculate the energy of these individually sub-bands.

D = wpdec(x,5,'db4');

E= wenergy(D);

99.6135193385093 / 0.233995892469453 / 0.0204106862264955/ 0.102240631189807 /0.00261870637874409 /0.00421324399028375/ 0.00736084264283965 /0.00509831935759924/ 0.000609947973077826 /0.000845424912145064/ 0.00157620879268279/ 0.00130380141377985/ 0.00172746075795348/ 0.00113357559477077/ 0.000363666808216811/ 0.00174664251888533/ 3.95721608402899e-06/ 3.26351602003420e-06/ 3.72295642951519e-06/ 1.95923593039854e-06/ 7.05027504361485e-05/ 6.16686308943517e-05/ 1.78220268529298e-05/ 4.58052059813187e-05/ 0.000115457314567345/ 0.000115442416453067/ 0.000274619807459558/ 0.000227727132719205/ 5.93847815613595e-05/ 6.37409673991104e-05/ 8.85165197923399e-05/ 8.20199866273504e-05/

As per my knowledge, wenergy decompose the whole signal energy in different frequency band's energies. but how can we take the energies individually from these 32 data points?

Answer 1

[Francisco Padilla]

% Example 2: 1-D wavelet packet decomposition %-------------------------------------------- load noisbump T = wpdec(noisbump,3,'sym4'); E = wenergy(T)

E =

95.0329 1.4664 0.6100 0.6408 0.5935 0.5445 0.5154 0.5965