[Gretl-devel] Re: crash looping through strings array

Am 08.02.2026 um 19:58 schrieb Cottrell, Allin: > On Sun, Feb 8, 2026 at 11:43 AM Sven Schreiber > <sven.schreiber(a)fu-berlin.de&gt; wrote: >> Am 08.02.2026 um 14:39 schrieb Cottrell, Allin: >>> On Sun, Feb 8, 2026 at 8:14 AM Sven Schreiber >>> <sven.schreiber(a)fu-berlin.de&gt; wrote: >>> >> Thanks, Allin! One more thought on this, though. As you've no doubt >> noticed when you fixed it, this doesn't appear to be related to loops or >> strings arrays. Instead here for me the simple following line already >> produces the crash: >> >> <hansl-crash> >> string s = "_" ~ 1 >> </hansl-crash> > Hmm. At some point in 2024 there was an attempt to make string > concatenation very flexible: we weren't going to insist on getting two > strings as arguments, one of them could be an array of strings or a > matrix, or a scalar -- except that the scalar case was not actually > supported and led to a crash. In current git I've corrected the scalar > case (previously I just made it an error), though I'm not sure the > full generality is really wanted. Anyway, here are examples of what > you can do: > > ... > > ? eval "egg" ~ 1 > egg1 > Done > </gretlcli> > > In the matrix and scalar case negative values are not accepted, and we > use the integer part of non-negative values. That policy is no doubt > debatable too. Right. Is the concatenation stuff even documented somewhere? I checked the guide and the hansl manual, without much success. Or is it unofficial and experimental...?

Anyway, for a scalar I guess one can always use sprintf() in principle to convert it. But I remember that we thought the matrix postfix could be useful.