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Re: st: file write + if condition?


From   David Kantor <kantor.d@att.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: file write + if condition?
Date   Mon, 17 Nov 2008 13:08:39 -0500

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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