getar0

 GETAR0 calculates average AR parameters for initialization of 
 AAR estimation

 C0 = getar0(S,P,NTR,NN);
    S  signal 
    P  list of model orders
    NTR  number of realizations
    NN   length each segment
    C0 extended covarance matrix (contains a0 and A0)

 [a0,A0] = getar0(...); % in future this will become obsolete 
    a0 average AR-parameters    
    A0 covariance