function n = features(m)% n = features(m)% returns a maximum feature id contained in the feature matrix m.% m : feature matrix loaded by fmatrix().% $Id: features.m,v 1.1 2004/11/08 08:31:05 dmochiha Exp $n = 0;for d = m  for id = d{:}.id    if id > n      n = id;    end  endend