Dear Logan, Allin and Ignacio,

Thanks a lot for your help. For simplicity reasons I used the solution proposed by Allin.

But I would like to report a little strange behavior. The following command gives different results when executed in different Gretl's builds:

<hansl code>
open australia.gdt
list L = PAU PUS E

eval L[2]
</hansl code>

Output:

Gretl 1.10.0cvs (build 2015-02-04)
? list L = PAU PUS E
? eval L[2]
PUS

Gretl 1.10.0cvs (build 2014-12-31)
? list L = PAU PUS E
? eval L[2]
2

Because of this my code worked just fine with Gretl 1.10.0cvs (build 2014-12-31).

Best,
Henrique Andrade