8:28 p.m.
Hi all,
I am right that the foreach-loop variant only supports lists but not
string arrays or matrices? At least the following does not work using
latest git-version.
<hansl>
strings S = defarray("A", "B", "C")
loop foreach i S -q
eval S[i]
endloop
matrix M = seq(1,3)
loop foreach i M -q
eval M[i]
endloop
</hansl>
I would find this quite handy, as nelem() or rows()/cols() may be avoided.
While it's clear what to do for a vector (simply iterate over the
column-/row-dimension), one may say that iteration for a matrix may work
over rows thus returning all columns for each row.
Best,
Artur
11:22 p.m.
On Tue, 3 Dec 2019, Artur Tarassow wrote:
<hansl>
strings S = defarray("A", "B", "C")
loop foreach i S -q
eval S[i]
endloop
matrix M = seq(1,3)
loop foreach i M -q
eval M[i]
endloop
</hansl>
In your examples the counter is a simple index and there would be no
substantial differences from "loop i = 1 .. nelem(S)"; IMO a proper
extension of the foreach loop to arrays would look more or less like
<hansl>
strings S = defarray("A", "B", "C")
loop foreach i S -q
eval strlen($i)
endloop
</hansl>
Apart from being rather cool, can you elaborate on the potential
advantages?
-------------------------------------------------------
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
-------------------------------------------------------
7:20 a.m.
Am 04.12.19 um 00:22 schrieb Riccardo (Jack) Lucchetti:
On Tue, 3 Dec 2019, Artur Tarassow wrote:
> <hansl>
>
> strings S = defarray("A", "B", "C")
> loop foreach i S -q
> eval S[i]
> endloop
>
> matrix M = seq(1,3)
> loop foreach i M -q
> eval M[i]
> endloop
>
> </hansl>
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
matrix M = seq(1,3)
loop foreach i M -q
eval $i
endloop
matrix M = mnormal(3,4)
loop foreach i M -q
eval $i
endloop
</hansl>
@Jack: I just wanted to save time by coding less, as <loop foreach i S>
is a bit shorter than <loop i=1..nelem(S)> :-)
Artur
7:48 a.m.
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.
cheers
sven
7:49 a.m.
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.
Artur
7:52 a.m.
Am 04.12.2019 um 08:49 schrieb Artur Tarassow:
Am 04.12.19 um 08:48 schrieb Sven Schreiber:
>
>
> 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.
If so, that would be cool (I repeat myself...).
thanks
sven
7:53 a.m.
Am 04.12.19 um 08:52 schrieb Sven Schreiber:
Am 04.12.2019 um 08:49 schrieb Artur Tarassow:
> Am 04.12.19 um 08:48 schrieb Sven Schreiber:
>>
>>
>> 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.
>
>
If so, that would be cool (I repeat myself...).
Fully agree :-P
Artur
3:30 p.m.
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".
Allin
3:39 p.m.
Am 04.12.19 um 16:30 schrieb Allin Cottrell:
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".
Oh, both of you are right. I should have inserted a stop after the eval
command in the loop block for checking whether I've obtained multiple
outputs or just a single one.
Artur
1845
days inactive
1846
days old
8 comments
4 participants
participants (4)
-
Allin Cottrell -
Artur Tarassow -
Riccardo (Jack) Lucchetti -
Sven Schreiber