[Gretl-devel] Re: foreach-loop for arrays

On Wed, 4 Dec 2019, Artur Tarassow wrote: > Am 04.12.19 um 08:48 schrieb Sven Schreiber: >> Am 04.12.2019 um 08:20 schrieb Artur Tarassow: >>> >>> Ah, that was my mistake. Sorry for the noise. I don't know why I just >>> did not make use of the $-accessor, but tried to do some selection. >>> The following works exactly as (I) expected it :-) >>> >>> <hansl> >>> strings S = defarray("A", "B", "C") >>> loop foreach i S -q >>>     eval $i >>> endloop >> >> ... (etc.) >> >> Are you sure? For me it just reproduces the object itself (array, >> matrix...) And that's what I expected, although I totally agree with you >> that automatically iterating would be cool. > > Oh ok, I've updated to latest git 1 hour ago. So maybe Allin did some work on > this last night but hasn't finished or announced it, yet. No, I haven't touched that code lately. Here I'm seeing what Sven says: each of the loops prints the given object once. A "foreach" loop works only for lists and strings. In the case of, for example, matrix M = seq(1,3) loop foreach i M -q eval $i endloop the loop controller is being fed a single string, "M"; then $i dumps that string into the "eval" line and the matrix M is printed. The loop is therefore exactly equivalent to "eval M".