The RATS Software Forum

Dear Tom,

I do want to implement a loop in a procedure which expands the estimation period by one month.
This is the simple procedure:

procedure taymodel series1 series2 series3 series4 series5 ibegin iend
type series series1 series2 series3 series4 series5
type int ibegin iend

do iend = firstob,iend
linreg(print) series2 firstob iend outge
#constant trend trend2
comp outget(iend)= outge(iend)
end do iend

end unit

But each time I try to pass series to the procedure I receive the error:

## SX23. Expected Variable/Element of Type INTEGER, Got Expression Instead
>>>>do iend = <<<<

There are apparentley problems with the loop, when I switch off the loop the error message disappears.
Whats wrong with the procedure, uisng the code in the main programm and not in the procedure works well.

Thanks a lot in advamce

You're using IEND two different ways. It looks like it's the end of your sample, but you're also using it as the loop index. You get the message because a parameter like the IEND from the procedure parameter list is, in effect, a constant within the procedure, so you can't reset it. You need to use some other (local) variable for the loop index:

procedure taymodel series1 series2 series3 series4 series5 ibegin iend
type series series1 series2 series3 series4 series5
type int ibegin iend
local integer thisend

do thisend = firstob,iend
linreg(print) series2 firstob thisend outge
#constant trend trend2
comp outget(thisend)= outge(thisend)
end do iend

end unit

(BTW, did you mean IBEGIN rather than FIRSTOB?)