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Re: st: Extracting scalar from a vector


From   "John Pfaff" <jpfaff@law.fordham.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Extracting scalar from a vector
Date   Wed, 07 Oct 2009 12:35:16 -0400

Thanks--that worked perfectly!

>>> Jeph Herrin <junk@spandrel.net> 10/07/09 12:21 PM >>>
If I understand correctly, -x- is a variable that
is constant across each value of -state-. In that
case

  foreach s in 6 8 17 21 {
    keep if state == `s'
    local start=x[1]
    forval i = `start' (1) 16 {
   ....
   }
  }

should do it.

hth,
Jeph


John Pfaff wrote:
> Thanks to those who helped me with my question yesterday. One more quick question after that.
> 
> I'm trying to extract a scalar value from a vector and use it in a forval loop. The code I have is this:
> 
> foreach s in 6 8 17 21 {
>   keep if state == `s'
>   forval i = XXX (1) 16 { 
>  ....
>  } 
> }
> 
> It's the XXX that is the problem. I have a vector x that takes on different values for each state s, and I want the forval loop to run from that value to 16. In other words, x == 14 when s  == 6, x == 10 when s == 8, and so on. But I have a lot of observations per state, so while x is constant for each state it is still a vector. How do I extract its scalar value to insert where the big XXX is in my code? This seems like it should be simple, but I've been thwarted for a while now.
> 
> Thanks so much!
> 
> All the best,
> 
> John Pfaff
> 
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