Artur seems to have some problems with this list, so I'm copy-pasting his message. In the meantime, I'll try to see what's wrong with the mailing list server. -------- Forwarded Message -------- Subject: Lag specification with "to" keyword fails for passed list parameters in functions Date: Fri, 22 May 2026 10:26:10 +0200 From: Artur T. <artur.tarassow(a)gmail.com&gt; Reply-To: artur.tarassow(a)gmail.com To: Gretl development <gretl-devel(a)gretlml.univpm.it&gt; Hi all, I've encountered what appears to be a bug (or unsupported feature) when using lag specifications with the "to" keyword inside functions when referring to a passed list parameter. The following code produces an error: "The symbol 'to' is undefined" <hansl> set verbose off open denmark.gdt --quiet function void foo(list D) list L = LRM D.LRM(-1) L += D.LRM(-2 to -4) # Error: "The symbol 'to' is undefined" end function foo(dataset) </> The "to" keyword fails specifically when used with lag specifications on passed list parameters inside functions. Is this a known limitation, an unimplemented feature, or an actual bug? Is it a parsing problem specific to how gretl handles lag syntax within function contexts. Thanks Artur -- ------------------------------------------------------- Riccardo (Jack) Lucchetti Dipartimento di Scienze Economiche e Sociali (DiSES) Università Politecnica delle Marche (formerly known as Università di Ancona) r.lucchetti(a)univpm.it http://www2.econ.univpm.it/servizi/hpp/lucchetti -------------------------------------------------------