9:43 a.m.
Hi all,
using latest git on Ubuntu 19.04 results in an error. I am trying to add
series to the list "L" stored in bundle "b" using the wildcard
operator
which does not work. See here:
<hansl>
clear
set verbose off
open denmark.gdt -q
series FOO_1 = 1
series FOO_2 = 2
# Add series to a list using the wildcard operator
list L = null
L += FOO* # WORKS
L
# Make use of bundle elements (list)
function void somefun (bundle *b)
list b.L = null
end function
bundle b = null
somefun(&b)
b.L += FOO* # ERROR: "The symbol 'FOO' is undefined"
eval b.L
</hansl>
I don't get why this shouldn't work.
Thanks,
Artur
12:04 p.m.
Am 05.07.2019 um 11:43 schrieb Artur Tarassow:
b.L += FOO* # ERROR: "The symbol 'FOO' is undefined"
eval b.L
</hansl>
I don't get why this shouldn't work.
Probably it should work, but notice that the asterisk "*" may confuse
the parser because it could also mean a multiplication operator. There
are two workarounds that seem to work:
1) substitute the += assignment with something equivalent:
list b.L = b.L FOO*
2) Simply be more explicit by adding "list" at the start:
list b.L += FOO*
hth,
sven
12:16 p.m.
Am 05.07.19 um 14:04 schrieb Sven Schreiber:
Am 05.07.2019 um 11:43 schrieb Artur Tarassow:
>
> b.L += FOO* # ERROR: "The symbol 'FOO' is undefined"
> eval b.L
> </hansl>
>
>
> I don't get why this shouldn't work.
>
Probably it should work, but notice that the asterisk "*" may confuse
the parser because it could also mean a multiplication operator. There
are two workarounds that seem to work:
True, the '*' may cause some confusion. But, if I remember correctly,
one cannot pass something like <list A = Series1*Series2>. Hence, I
cannot see a reason to interpret the asterisk as the multiplication
operator -- but maybe I am wrong ;-)
1) substitute the += assignment with something equivalent:
list b.L = b.L FOO*
2) Simply be more explicit by adding "list" at the start:
list b.L += FOO*
Thanks, Sven. I like the latter solution which works well.
Artur
1:23 p.m.
Am 05.07.2019 um 14:16 schrieb Artur Tarassow:
Am 05.07.19 um 14:04 schrieb Sven Schreiber:
> Probably it should work, but notice that the asterisk "*" may confuse
> the parser because it could also mean a multiplication operator. There
> are two workarounds that seem to work:
True, the '*' may cause some confusion. But, if I remember correctly,
one cannot pass something like <list A = Series1*Series2>.
Indeed you cannot do that, but you can do:
list A = Series1 * 2
(Although I'm not sure this is supported or recommended usage.)
But as I said before, it probably "should" work, in the sense that it's
a bug.
cheers
sven
2:48 p.m.
On Fri, 5 Jul 2019, Sven Schreiber wrote:
Am 05.07.2019 um 14:16 schrieb Artur Tarassow:
>
> Am 05.07.19 um 14:04 schrieb Sven Schreiber:
>> Probably it should work, but notice that the asterisk "*" may confuse
>> the parser because it could also mean a multiplication operator. There
>> are two workarounds that seem to work:
>
> True, the '*' may cause some confusion. But, if I remember correctly,
> one cannot pass something like <list A = Series1*Series2>.
Indeed you cannot do that, but you can do:
list A = Series1 * 2
(Although I'm not sure this is supported or recommended usage.)
"One cannot pass something like" (Artur)
list A = Series1*Series2
True. That's an attempt to put into a list an anonymous, on-the-fly
series that is the product of Series1 and Series2. Lists can include
only named series.
"But you can do" (Sven)
list A = Series1 * 2
True. The "list" specifier tells gretl to interpret the space
separated RHS terms as follows:
"Series1" : the series of that name
"*" : all the series in the dataset, except const
"2" : the series with ID number 2
So you end up with a list containing all the series, including
repeats of Series1 and whichever series has ID 2. Perfectly legal
but unlikely to be of use to man or beast.
Allin
2:34 p.m.
On Fri, 5 Jul 2019, Artur Tarassow wrote:
Am 05.07.19 um 14:04 schrieb Sven Schreiber:
>
> 2) Simply be more explicit by adding "list" at the start:
>
> list b.L += FOO*
>
Thanks, Sven. I like the latter solution which works well.
That's certainly the recommended version. However, we now (git) make
an effort to detect a bundled list on the LHS of a modified
assignment at the preprocessing stage, so plain "b.L += FOO*" will
now work (though not in any release).
Allin
10:40 a.m.
Am 05.07.19 um 16:34 schrieb Allin Cottrell:
On Fri, 5 Jul 2019, Artur Tarassow wrote:
> Am 05.07.19 um 14:04 schrieb Sven Schreiber:
>>
>> 2) Simply be more explicit by adding "list" at the start:
>>
>> list b.L += FOO*
>>
> Thanks, Sven. I like the latter solution which works well.
That's certainly the recommended version. However, we now (git) make an
effort to detect a bundled list on the LHS of a modified assignment at
the preprocessing stage, so plain "b.L += FOO*" will now work (though
not in any release).
Thanks for this fix, Allin.
Best,
Artur
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Sven Schreiber