Re: st: file write + if condition?

[David Kantor <kantor.d@att.net>]

At 12:05 PM 11/17/2008, Even wrote:
> I am using the - file write - command to write a series of lines to 
> a text file. The text file is used as a parameter file for an external program.
>
> The text file should contain information on several variables for 
> several different observations and I thus like to loop over 
> observations and use an - if - condition to write information from 
> the correct observation in each line. Hovwever, the - file write - 
> command does not seem to allow - if - conditions. I have tried using 
> the - if - command with code along these lines:
>
>    tempname FILE
>    file open `FILE' using test.ajo, write replace
>      sum id
>      local minid = r(min)
>      local maxid = r(max)
>    forvalues i = `minid'(1)`maxid' {
>       if id=`id' {
>         file write `FILE'   %7.1f   (species)   _n
>         }
>      }
> [...]

Nick gave some excellent advice; I was also going to suggest that you 
really want
   if id[`i'] == `id' {

However, it is not clear what `id'  is (i.e., what the local id 
holds). Was it defined previously?
Possibly, you want a nested loop, one being  forvalues i , as you 
have it, the other being a foreach on id.

HTH
--David

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