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Re: st: Defining upper limit of loop


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Defining upper limit of loop
Date   Wed, 11 Dec 2013 22:17:42 +0000

Yes indeed. Suppose that you want to cycle over 1 to the maximum of
some variable:

su myvar, meanonly

forval i = 1/`r(max)'  {

The more general syntax is

forval i = `=exp1'/`=exp2' {

where exp1 and exp2 are expressions to be evaluated on the fly.

So

(1)

forval i = `=2+2'/`=6*7' {

would be

forval i = 4/42 {

(2)

su myvar, meanonly

forval j = `r(min)'/`r(max)' {

would cycle from the minimum to the maximum (in steps of 1).

Little note. `r(min)' or `r(max)' and `=r(min)' or `=r(max)'  work
equally well. In principle they don't mean exactly the same, but the
result is identical.

Big note. This is nothing to with the syntax of -forval- as such. It
is just general Stata syntax. See -help macro-.
Nick
njcoxstata@gmail.com


On 11 December 2013 22:08, Nabin Kafle <nkafle89@gmail.com> wrote:
> Is there a way that I can use the forvalues command in stata in a way
> that I upper value of the loop can be defined from the varibale list.
>
> forvalues i = 1/"var name" {
> code for loop
> *
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