Re: [Gretl-users] Loop question

Wed, 26 May 2010 00:03:18 +0100 

I disagree with your proposed syntax.
I should know that the current form of the loop for, comes from the C
language (and then C++ and Java).
I think that we could have something like:
loop n in 6 12 24 xlist

Where  n is the loop variable 6, 12 and 24 are numbers, and xlist is a list
of the same type of n. This way we could have:
loop a in "G" "r" "e" "t" "l"
or
loop a in alist, where alist is a list of strings.

I am avoiding using the loop foreach, because it uses numbers to index
variables.

Is this a valuable command? The cost of developing it (and maintain), seems
too high for the value it brings.

Regards,
Hélio
On Tue, May 25, 2010 at 10:00 PM, Henrique Andrade <
henrique.coelho(a)gmail.com> wrote:

> Dear Riccardo, Kehl and Guilherme,
>
> I was looking for something simple. The option "loop for (n=6; n<=24;
> n*=2)" worked just fine. But in my humble opinion the option "loop for (n=6;
> n=12; n=24)" should work too, but this is not a big deal ;-)
>
> Thank you so much!
>
> Um abraço,
> Henrique
>
> Em 25 de maio de 2010 17:45, Hélio Guilherme 
> <helioxentric(a)gmail.com>escreveu:
>
> Hi Henrique,
>>
>> I believe that this does what you want:
>> loop for (n=6; n<=24; n*=2) --quiet
>>
>> No other simple options.
>>
>>
>> On Tue, May 25, 2010 at 8:53 PM, Henrique Andrade <
>> henrique.coelho(a)gmail.com> wrote:
>>
>>> Dear Riccardo, Kehl and Artur,
>>>
>>> Thanks a lot for your help! I'd tried all the options you gave me and
>>> my final script looks like this:
>>>
>>> <script>
>>> scalar n=0
>>> loop for (n=6;n<=24;n=n*2) --quiet
>>>     scalar m = $T - n + 1
>>>     loop j=2..nelemY --quiet
>>>         matrix R$n_$j = zeros(m,1)
>>>         loop i=1..m --quiet
>>>             loop c=1..n --quiet
>>>                 row = i + n - c
>>>                 R$n_$j[i] += r$j[row, c]
>>>             endloop
>>>         endloop
>>>     endloop
>>>     matrix mci$n = R$n_2 + R$n_3
>>> endloop
>>> </script>
>>>
>>> Now, because I just need the values for 6, 12 and 24, I'm trying to
>>> substitute the second line "loop for (n=6;n<=24;n=n*2)" for this:
>>>
>>> loop for (n=6;n=12;n=24)
>>>
>>> But the script isn't working. Any hints?
>>>
>>> Best regards,
>>> Henrique
>>>
>>>
>>> 2010/5/25 artur bala <artur.bala(a)laposte.net>
>>>
>>> Or, if your index is something like of a geometric series as it seems to
>>>> be (let's say 6, 12, 24, 48, and so on) and too long to do manually
>>>> you can try this one:
>>>> <script>
>>>> scalar count=0
>>>> loop for (count=6;count<=24;count=count*2) --quiet
>>>>    <instructions>
>>>> endloop
>>>> <\script>
>>>>
>>>> cheers,
>>>> artur
>>>>
>>>> Riccardo (Jack) Lucchetti a écrit :
>>>> > On Tue, 25 May 2010, Henrique Andrade wrote:
>>>> >
>>>> >> Dear Gretl Community,
>>>> >>
>>>> >> I'm trying to use a loop index inside a script but I don't know how.
>>>> >> According
>>>> >> to "Gretl User’s Guide" the syntax looks like this:
>>>> >>
>>>> >> loop i=1..24
>>>> >>
>>>> >> But I just need the points where "i" is equal to 6, 12 and 24.
>>>> >> Something like this:
>>>> >>
>>>> >> loop i=6;12;24
>>>> >>
>>>> >> How can I do that?
>>>> >
>>>> > For example, this way:
>>>> > <script>
>>>> > matrix foo = { 6, 12, 24 }
>>>> > n = cols(foo)
>>>> > loop for i=1..n
>>>> >     bar = foo[i]
>>>> >     print bar
>>>> > end loop
>>>> > </script>
>>>> >
>>>> >
>>>> > Riccardo (Jack) Lucchetti
>>>> > Dipartimento di Economia
>>>> > Università Politecnica delle Marche
>>>> >
>>>> > r.lucchetti(a)univpm.it
>>>> > http://www.econ.univpm.it/lucchetti
>>>> >
>>>> ------------------------------------------------------------------------
>>>> >
>>>> > _______________________________________________
>>>> > Gretl-users mailing list
>>>> > Gretl-users(a)lists.wfu.edu
>>>> > http://lists.wfu.edu/mailman/listinfo/gretl-users
>>>>
>>>>
>>>> _______________________________________________
>>>> Gretl-users mailing list
>>>> Gretl-users(a)lists.wfu.edu
>>>> http://lists.wfu.edu/mailman/listinfo/gretl-users
>>>>
>>>
>>>
>>>
>>> --
>>> Henrique C. de Andrade
>>> Doutorando em Economia Aplicada
>>> Universidade Federal do Rio Grande do Sul
>>> www.ufrgs.br/ppge
>>>
>>> _______________________________________________
>>> Gretl-users mailing list
>>> Gretl-users(a)lists.wfu.edu
>>> http://lists.wfu.edu/mailman/listinfo/gretl-users
>>>
>>
>>
>> _______________________________________________
>> Gretl-users mailing list
>> Gretl-users(a)lists.wfu.edu
>> http://lists.wfu.edu/mailman/listinfo/gretl-users
>>
>
>
>
> --
> Henrique C. de Andrade
> Doutorando em Economia Aplicada
> Universidade Federal do Rio Grande do Sul
> www.ufrgs.br/ppge
>
> _______________________________________________
> Gretl-users mailing list
> Gretl-users(a)lists.wfu.edu
> http://lists.wfu.edu/mailman/listinfo/gretl-users
>
I disagree with your proposed syntax.
I should know that the current form of the loop for, comes from the C language (and then C++ and Java).
I think that we could have something like:
loop n in 6 12 24 xlist

Where  n is the loop variable 6, 12 and 24 are numbers, and xlist is a list of the same type of n. This way we could have:
loop a in "G" "r" "e" "t" "l"
or
loop a in alist, where alist is a list of strings.

I am avoiding using the loop foreach, because it uses numbers to index variables.

Is this a valuable command? The cost of developing it (and maintain), seems too high for the value it brings.

Regards,
Hélio
On Tue, May 25, 2010 at 10:00 PM, Henrique Andrade <henrique.coe...@gmail.com> wrote:
Dear Riccardo, Kehl and Guilherme,

I was looking for something simple. The option "loop for (n=6; n<=24; n*=2)" worked just fine. But in my humble opinion the option "loop for (n=6; n=12; n=24)" should work too, but this is not a big deal ;-)

Thank you so much!

Um abraço,
Henrique

Em 25 de maio de 2010 17:45, Hélio Guilherme <helioxent...@gmail.com> escreveu:

Hi Henrique,

I believe that this does what you want:
loop for (n=6; n<=24; n*=2) --quiet

No other simple options.


On Tue, May 25, 2010 at 8:53 PM, Henrique Andrade <henrique.coe...@gmail.com> wrote:
Dear Riccardo, Kehl and Artur,

Thanks a lot for your help! I'd tried all the options you gave me and
my final script looks like this:

<script>
scalar n=0
loop for (n=6;n<=24;n=n*2) --quiet
    scalar m = $T - n + 1
    loop j=2..nelemY --quiet
        matrix R$n_$j = zeros(m,1)
        loop i=1..m --quiet
            loop c=1..n --quiet
                row = i + n - c
                R$n_$j[i] += r$j[row, c]
            endloop
        endloop
    endloop
    matrix mci$n = R$n_2 + R$n_3
endloop
</script>

Now, because I just need the values for 6, 12 and 24, I'm trying to
substitute the second line "loop for (n=6;n<=24;n=n*2)" for this:

loop for (n=6;n=12;n=24)

But the script isn't working. Any hints?

Best regards,
Henrique


2010/5/25 artur bala <artur.b...@laposte.net>

Or, if your index is something like of a geometric series as it seems to
be (let's say 6, 12, 24, 48, and so on) and too long to do manually
you can try this one:
<script>
scalar count=0
loop for (count=6;count<=24;count=count*2) --quiet
   <instructions>
endloop
<\script>

cheers,
artur

Riccardo (Jack) Lucchetti a écrit :
> On Tue, 25 May 2010, Henrique Andrade wrote:
>
>> Dear Gretl Community,
>>
>> I'm trying to use a loop index inside a script but I don't know how.
>> According
>> to "Gretl User’s Guide" the syntax looks like this:
>>
>> loop i=1..24
>>
>> But I just need the points where "i" is equal to 6, 12 and 24.
>> Something like this:
>>
>> loop i=6;12;24
>>
>> How can I do that?
>
> For example, this way:
> <script>
> matrix foo = { 6, 12, 24 }
> n = cols(foo)
> loop for i=1..n
>     bar = foo[i]
>     print bar
> end loop
> </script>
>
>
> Riccardo (Jack) Lucchetti
> Dipartimento di Economia
> Università Politecnica delle Marche
>
> r.lucche...@univpm.it
> http://www.econ.univpm.it/lucchetti
> ------------------------------------------------------------------------
>
> _______________________________________________
> Gretl-users mailing list
> gretl-us...@lists.wfu.edu
> http://lists.wfu.edu/mailman/listinfo/gretl-users


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--
Henrique C. de Andrade
Doutorando em Economia Aplicada
Universidade Federal do Rio Grande do Sul
www.ufrgs.br/ppge

_______________________________________________
Gretl-users mailing list
gretl-us...@lists.wfu.edu
http://lists.wfu.edu/mailman/listinfo/gretl-users


_______________________________________________
Gretl-users mailing list
gretl-us...@lists.wfu.edu
http://lists.wfu.edu/mailman/listinfo/gretl-users



--
Henrique C. de Andrade
Doutorando em Economia Aplicada
Universidade Federal do Rio Grande do Sul
www.ufrgs.br/ppge

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