8:21 p.m.
Dear all,
Gretl on my Windows crashes running this script
<hansl>
strings s = null
s += "text"
s -= "text"
</hansl>
Does anyone have the same problem?
Federico
3:52 a.m.
Am 22.10.2022 um 02:21 schrieb Federico Fiorani:
Dear all,
Gretl on my Windows crashes running this script
<hansl>
strings s = null
s += "text"
s -= "text"
</hansl>
Does anyone have the same problem?
Yes, I see this, too - thanks for the report.
This crash must be fixed, of course, but using the "-=" operator for an
array is not supported, AFAIK. In fact, I believe it is not possible to
selectively delete elements from an array after creation - to achieve
that, you would have to make a copy of the array where you skip the
unwanted elements. Other alternatives include: Simply drag along these
additional elements and ignore them (by using appropriate checks), or
perhaps in some cases use a gretl "bundle" datatype instead of an array.
Bundle elements can be deleted.
BTW, as a side remark, if you want to get the index positions where a
strings array contains a given string, you can use the instrings()
function, so in your example instrings(s, "text"). (But I admit that
getting the complementary positions where this condition is false is a
little more involved.)
cheers
sven
5:47 a.m.
Am 22.10.22 um 09:52 schrieb Sven Schreiber:
Am 22.10.2022 um 02:21 schrieb Federico Fiorani:
> Dear all,
> Gretl on my Windows crashes running this script
>
> <hansl>
> strings s = null
> s += "text"
> s -= "text"
> </hansl>
>
> Does anyone have the same problem?
Here under Ubuntu using git version from 4 days ago or so, the following
does _not_ lead to a crash:
<hansl>
clear
set verbose off
print "Experiment 1"
strings S = defarray("a")
catch S -= "a"
print S
</hansl>
Yes, I see this, too - thanks for the report.
This crash must be fixed, of course, but using the "-=" operator for an
array is not supported, AFAIK.
I assumed the same, Sven. However, actually the -= operator works with
arrays:
<hansl>
clear
set verbose off
print "Experiment 1"
strings S = defarray("a")
catch S -= "a"
print S
print "Experiment 2"
strings S = defarray("a", "b")
catch S -= "a"
</hansl>
However, the following scenario leads to a crash:
<hansl>
clear
set verbose off
set assert stop
print "Experiment 3"
strings S = defarray("a", "b")
catch S -= "b"
assert($error == FALSE)
print S
</hansl>
Artur
8:57 a.m.
On Fri, Oct 21, 2022 at 8:22 PM Federico Fiorani <deferoci(a)gmail.com> wrote:
Dear all,
Gretl on my Windows crashes running this script
<hansl>
strings s = null
s += "text"
s -= "text"
</hansl>
Thanks for the report, Federico. That should now be fixed in git, with
snapshots to follow shortly.
Allin
6:08 p.m.
Am 22.10.2022 um 14:57 schrieb Cottrell, Allin:
On Fri, Oct 21, 2022 at 8:22 PM Federico
Fiorani<deferoci(a)gmail.com> wrote:
> Dear all,
> Gretl on my Windows crashes running this script
>
> <hansl>
> strings s = null
> s += "text"
> s -= "text"
> </hansl>
Thanks for the report, Federico. That should now be fixed in git, with
snapshots to follow shortly.
Thanks, Allin, but after Artur's intervention it's not clear to me
whether "-=" is officially supported or not? And if it is (for which I'm
not pushing), would it remove all occurrences or just the first one?
cheers
sven
6:23 p.m.
On Sat, Oct 22, 2022 at 6:08 PM Sven Schreiber
<sven.schreiber(a)fu-berlin.de> wrote:
Am 22.10.2022 um 14:57 schrieb Cottrell, Allin:
On Fri, Oct 21, 2022 at 8:22 PM Federico Fiorani <deferoci(a)gmail.com> wrote:
Dear all,
Gretl on my Windows crashes running this script
<hansl>
strings s = null
s += "text"
s -= "text"
</hansl>
Thanks for the report, Federico. That should now be fixed in git, with
snapshots to follow shortly.
Thanks, Allin, but after Artur's intervention it's not clear to me whether
"-=" is officially supported or not? And if it is (for which I'm not
pushing), would it remove all occurrences or just the first one?
Yes, it's officially supported (the relevant Guide chapter now
reflects this). But it only works for arrays of strings, and it
removes all occurrences from the array.
I've also documented the use of a negative index with arrays: this
works to remove an element from an array of any type, For example, one
can use
A = A[-2]
to remove the second element from array A.
Allin
5:29 a.m.
Am 23.10.2022 um 00:23 schrieb Cottrell, Allin:
On Sat, Oct 22, 2022 at 6:08 PM Sven Schreiber
<sven.schreiber(a)fu-berlin.de> wrote:
>
> Thanks, Allin, but after Artur's intervention it's not clear to me whether
"-=" is officially supported or not? And if it is (for which I'm not
pushing), would it remove all occurrences or just the first one?
Yes, it's officially supported (the relevant Guide chapter now
reflects this). But it only works for arrays of strings, and it
removes all occurrences from the array.
I've also documented the use of a negative index with arrays: this
works to remove an element from an array of any type, For example, one
can use
A = A[-2]
to remove the second element from array A.
Aha! So the natural follow-up question is: what about indexing vectors
with this? Like A[- {1,3}] ?
thanks
sven
8:21 a.m.
On Sun, Oct 23, 2022 at 5:29 AM Sven Schreiber
<sven.schreiber(a)fu-berlin.de> wrote:
Am 23.10.2022 um 00:23 schrieb Cottrell, Allin:
On Sat, Oct 22, 2022 at 6:08 PM Sven Schreiber
<sven.schreiber(a)fu-berlin.de> wrote:
Thanks, Allin, but after Artur's intervention it's not clear to me whether
"-=" is officially supported or not? And if it is (for which I'm not
pushing), would it remove all occurrences or just the first one?
Yes, it's officially supported (the relevant Guide chapter now
reflects this). But it only works for arrays of strings, and it
removes all occurrences from the array.
I've also documented the use of a negative index with arrays: this
works to remove an element from an array of any type, For example, one
can use
A = A[-2]
to remove the second element from array A.
Aha! So the natural follow-up question is: what about indexing vectors with this? Like
A[- {1,3}] ?
Yes, that works too.
Allin
722
days inactive
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7 comments
4 participants
participants (4)
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Artur T. -
Cottrell, Allin -
Federico Fiorani -
Sven Schreiber