getBandpower

 Calculates bandpower values in the specified frequency band.

 This function calculates bandpower values in the specified frequency band.

 Usage:
   bp = getBandpower(s, h, triallen, f, trls, class, rmartif, submean);
 
 Input parameters:
   s        ... Input signal (as obtained by sload)
   h        ... Header structure (as obtained by sload)
   startend ... Start and end point within trial (s)
   f        ... Frequency band (Hz)

 Optional input parameters:
   trls    ... Trials
   class   ... Class
   rmartif ... Remove artifacts
   submean ... Subtract mean signal

 Output parameters:
   bp ... Bandpower