leta

 LETA Compute the eta values of long data signals.
   ETAVAL = LETA(DATA, T) updates the internal structures and returns
   the eta values of the data signals seen so far.
   Important: the DATA signal must be normalized
              (zero mean and unit variance)

   LETA without arguments clears the global structures.

   example:    
   % clear the global structure
   leta
   % first data chunck
   leta(DATA1,1)
   % ...
   % last data chunck
   eta_values = leta(DATAN,1)

   See also ETA