a lista as condition

[Ingrid Schockaert]

dear all,

I want to do something like this:

agegroup: if (municipality_id is in "list of municipality_ids" ,
             5 * trunc(age / 5),
             age)

In other words, only if the municipality_id of an individual is part of a list of predetermined municipalities, than create a new age variable.

Is that possible in Liam2.

Regards,

Ingrid

[Djibril Togola]

Dear Ingrid:

I think you have at least one solution to the issue you've exposed :

*** If municipality_id has only one modality, a simple egality test should solve the problem like this :

agegroup: if ( "list of municipality_ids" = = municipality_id ,

             5 * trunc(age / 5),
             age)

*** If municipality_id has more than one modality, you still can use a simple egality test, either by creating an intermediate boolean variable either by creating both variables   ("list of municipality_ids"  and municipality_id) as some fields of the entity individuals.

Good luck, 

------
Djibril TOGOLA



Djibril...@u-pec.fr / gmail.com

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[Gaëtan de Menten]

Hello Ingrid,

 

Sadly, LIAM2 does not support this operation natively (yet). The good news is that you can emulate it relatively easily.

 

If your list of values (municipality_ids) is short, the simplest is to use an "or" condition:

 

if(municipality_id == 10 or municipality_id == 13 or municipality_id == 17,

   5 * trunc(age / 5),
   age)

 

If it is longer than a few elements or if the list is determined dynamically, using a loop will be more practical:

 

num_minicipalities: 30

in_mun_list: False                 

poslist: 0

while poslist < num_municipalities:

    in_mun_list: in_mun_list or municipality_id == municipality_ids[poslist]

   poslist: poslist + 1

res: if(in_mun_list,

        5 * trunc(age / 5),
        age)

 

But it would probably be cleaner to extract a reusable function out of this:

 

    inlist(expr, valuelist):

        - invaluelist: False

        - poslist: 0

        - while poslist < valuelist.__len__() and not all(invaluelist):

            - invaluelist: invaluelist or expr == valuelist[poslist]

            - poslist: poslist + 1

        - return invaluelist

 

    other_func():

        - municipality_ids: [10, 20, 30]

       - in_mun_list: inlist(municipality_id, municipality_ids)

  - res: if(in_mun_list,

            5 * trunc(age / 5),
            age)

        # or even, do everything in a single expression:

        - res: if(inlist(municipality_id, [10, 20, 30]),

            5 * trunc(age / 5),
            age)

 

 

Hope it helps,

Gaëtan

 

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[Ingrid Schockaert]

Thanks to all for the reactions.

Its very clear now...it was the expression "inlist" I was looking for...

merci!