Or alternatively you can try loop i=1..n and use 6*i inside the loop if you need the numbers you wrote as an example. daniel -----Original Message----- From: "Riccardo (Jack) Lucchetti" <r.lucchetti(a)univpm.it&gt; To: Gretl list <gretl-users(a)lists.wfu.edu&gt; Date: Tue, 25 May 2010 08:08:26 +0200 (CEST) Subject: Re: [Gretl-users] Loop question On Tue, 25 May 2010, Henrique Andrade wrote: For example, this way: <script> matrix foo = { 6, 12, 24 } n = cols(foo) loop for i=1..n bar = foo[i] print bar end loop </script> Riccardo (Jack) Lucchetti Dipartimento di Economia Università Politecnica delle Marche r.lucchetti(a)univpm.it http://www.econ.univpm.it/lucchetti