[Gretl-users] Delete several series

Hi all, I'm trying to delete several series with a loop like this: <gretl> loop i=1 ..100 if sum(ok(series$i)) < 20 delete series$i endif endloop </gretl> Let's say I have series1, series2, ...,series100. I want to delete all series with less than 20 observations. But, Gretl doesn't allow this kind of massive deletion. Any ideas on how can I check over several series and delete those whic don't fit the criteria? Many thanks in advance -- Filipe Rodrigues da Costa