Am 08.07.2011 08:48, schrieb RENIER Mélanie: If you mean a gretl database, maybe something like this (untested): list outlist = null loop i=1..m series ser$i = yourmatrix[,i] list outlist += ser$i end loop store "outfilename.db" outlist --database If you mean an ODBC database, this reminds me of your earlier question which in the end I never really answered because it's too complicated... good luck, sven