Special subscript values

[pdiazs]

I`m working with a subscript variable that includes population for different areas.

In order to develop easy equations i am thinking to include n subscripts (for n areas) + a total additional value at the end.

A) is it possible to populate the variable in three steps?

1 POP(1,2.....n)
2 Total = sum POP(1,n)
3 POP(n+1) = Total

B Is it possible to use partial values of the variable subscripts?

1 Pop(1,2......n,totP)
2 MktCuota (1,2.....n,n+1)
3 MktCuota(n+1)= Pop(1....n) * MktCuota(1,... n)/Pop(n+1)

Cheers

[LAUJJL]

Hi

Thhere is no restriction to anything as long as it works. But the problem is that you will have variables that have different meaning depending on the value of the subscript, a very bad practice, one of the very good practive of SD being the correct and unambiguous naming of variables!

Regards.

JJ

[Administrator]

One other thing to remember. Your profile indicates that you are a PLE user, subscripts are not possible with PLE.

[tomfid]

A) It would be better to write:

Code: Select all

category : (c1-c10) ~~ population categories (age cohorts?)
population[category] = ... ~ people ~ (dynamics of population go here)
total population = SUM(population[category!]) ~ people

B) Subranges are easy:

Code: Select all

subcategory : c1, c3, c5
total subcat population = SUM(population[subcategory!]) ~ people

See http://www.vensim.com/documentation/usr17.htm and http://www.vensim.com/documentation/exc ... ations.htm