sven, currently smpl 1 20 corr smpl+1+1 and corr smpl+1+1 corr on the raw
data for 20 data points
is quite laborious want to is to loop the corr on 20 points and write
the output of corr to a series save on gretl for more other calculation
that why ask what is the accessor to retrive the output of corr and to
write to the series and save