au

% y = au(x, fs, lo [, hi])
%
% Extract data from x for time range lo to hi in milliseconds.  If lo
% is [], start at the beginning.  If hi is [], go to the end.  If hi is
% not specified, return the single element at lo.  If lo<0, prepad the
% signal to time lo.  If hi is beyond the end, postpad the signal to
% time hi.