use of matchnum

[Barbara91]

salve, sto lavorando con un codice SAS in cui compare l'utilizzo di 'matchnum' per la definizione di un parametro:

b=j(1,matchnum,0);

qualcuno sa come interpretare questa riga?

all'interno del codice non fa riferimento a niente, è a se stante, vorrei sapere se matchnum è una funzione che vi è nota.

Grazie

[Kurt_Bremser]

Given the fact that the number of Italian-writing posters here is very limited (and I don't know if any of the usual "solvers" understand Italian at all), but basically all do read/write English, I suggest you re-post your question in English.

[RW9]

There is no matchnum function or parameter as far as I know, nor can I find any information on it.  By its use it looks like a dataset variable name, however what the j() function is I don't know, could it be an array?  Maybe post more of the code so we can see it in context.

[PeterClemmensen]

I'm guessing this line of code is part of an IML Procedure since the J Function is part of the SAS/IML language 🙂 you can read about it at the documentation page

http://support.sas.com/documentation/cdl/en/imlug/65547/HTML/default/viewer.htm#imlug_langref_sect20...

and in the article 

How the J function got its name

In your case, you define a matrix with 1 row and matchnum columns of zeros, ie. a row vector of zeros.