Re: st: Re: Programming, rollreg, gaps, and memory

[Cameron Hooper <chooper@umich.edu>]

Michael Blasnik wrote:
> I think you may need to add:
>
> drop `res'
>
> at the end of your loop.

Hi Michael

Thanks for your suggestion. I did not realize -tempvar- operated in this 
fashion. Added the -drop- command fixed that particular problem. (Others 
have since arisen!) Just to convince myself I wrote the following test 
program to explore the behaviour of -tempvar-. Other complete newbies 
might also find it interesting:

. clear
. set obs 5
obs was 0, now 5

. gen x = _n * uniform()

. capture drop nv
. capture program drop tmpv

. program tmpv
  1.   qui {
  2.     gen nv = .
  3.     forvalues i = 1/5 {
  4.       tempvar t
  5.       gen `t' = x[_n]
  6.       describe
  7.       replace nv = r(k) in `i'
  8.     }
  9.   }
 10. end
.
. tmpv
. list

     +---------------+
     |        x   nv |
     |---------------|
  1. | .5415702    3 |
  2. | .0175157    4 |
  3. |  .921708    5 |
  4. | 1.988945    6 |
  5. | 4.485629    7 |
     +---------------+

Yep. Each each iteration of the -forvalues- loop generates a new variable.

Thanks,

Cameron
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