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Hi, I want to run over two subperiods [1, !d-1] and [!d, !n] defined as the strings subp1 and subp2, the SAME list of instructions where a time increment !i is used. One way of doing this is :

smpl {subp1}
for !i=1 to !d-1
list of instructions
next
smpl {subp2}
for !i=!d to !n
list of instructions
next

There is surely a shorter way of programming this without repeating the list of instructions. Is there?
Thanks

Hello,

There are a couple of ways you could eliminate the redundancy in your program. You could move the common code to a subroutine, after which your program would look something like this:
You'd need to work about appropriate parameters for the subroutine and double-check that it still generates all the correct side effects.

Alternatively, you could employ an additional loop over the two sets of specifications, (subp1, 1, !d-1) and (subp2, !d, !n), a la:
Further simplifications are possible if the sample strings and associated indices are related to one another, but that depends on code not shown.

Thank you so much, the second way was the kind of approach I was seeking. If I do that way, am I obliged to give a name to each sub-period, here subp1 and subp2, since these names do not appear anywhere in the program, therefore seem not to be useful? That is, can I write the first sentence as:

%specs = "1 " + @str(!d-1) + " " + @str(!d) + " " + @str(!n)

Thanks

Certainly, with the appropriate downstream changes: