EEG signal feature extraction Matlab Help

I have a working Matlab code for generation of Wavelet coefficients to extract alpha, beta, gamma, delta and theta frequencies from given EEG Dataset.

if true
  % code
end
%%Extract 5 frequency bands:
S = importdata('MyDataFile.txt');
              waveletFunction = 'db8';      %OR 'sym8' OR 'coif5' OR 'db4';
              [C,L] = wavedec(S,8,waveletFunction);
              %%Calculation The Coificients Vectors
              cD1 = detcoef(C,L,1);                   %NOISY
              cD2 = detcoef(C,L,2);                   %NOISY
              cD3 = detcoef(C,L,3);                   %NOISY
              cD4 = detcoef(C,L,4);                   %NOISY
              cD5 = detcoef(C,L,5);                   %GAMA
              cD6 = detcoef(C,L,6);                   %BETA
              cD7 = detcoef(C,L,7);                   %ALPHA
              cD8 = detcoef(C,L,8);                   %THETA
              cA8 = appcoef(C,L,waveletFunction,8);   %DELTA
              %%%%Calculation the Details Vectors
              D1 = wrcoef('d',C,L,waveletFunction,1); %NOISY
              D2 = wrcoef('d',C,L,waveletFunction,2); %NOISY
              D3 = wrcoef('d',C,L,waveletFunction,3); %NOISY
              D4 = wrcoef('d',C,L,waveletFunction,4); %NOISY
              D5 = wrcoef('d',C,L,waveletFunction,5); %GAMMA
              D6 = wrcoef('d',C,L,waveletFunction,6); %BETA
              D7 = wrcoef('d',C,L,waveletFunction,7); %ALPHA
              D8 = wrcoef('d',C,L,waveletFunction,8); %THETA
              A8 = wrcoef('a',C,L,waveletFunction,8); %DELTA

if true
  % code
end

• Item one: Please Help me to know that how these coefficients will be used ahead for generation of these different waveforms. I am doing it by Convolution as for example "y= conv(S,A8)". Is that right technique?
• Item two: also please help me to know that in this code we are not defining any frequency range but all these waves have specific ranges of frequencies like 4 to 8Hz etc. So how this code is separating them into different frequency sets?

[karandeep kaur]

can you please name the dataset on which this extraction of alpha, beta, gamma, delta and theta frequencies are performed .

[kirman serdar]

@JAGRITI SAINI did you find answer of your question ?

Answer 1

[Mokshith Kumar]

thank you so much man :)