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st: Retrieving data from matrix


From   "Francis, Richard N" <rnfrancis@utep.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Retrieving data from matrix
Date   Mon, 2 Dec 2013 21:22:03 +0000

Hi Statalist members,

Have a simple program below, but receive the following error:

"new variables cannot be uniquely named or already defined"

I am using Stata13 with Windows.

The first execution of the loop works fine, then as the second loop is ending, I receive the "new variables cannot be uniquely named or already defined" error message.

Here is the code:

destring gvkey, replace
 egen id = group(gvkey), label
 gen date1 = yq(year, fqtr)
 tsset id date1, quarterly
 su id, meanonly
 local limit=r(max)
 foreach v in k maic sic rmse DFGLS {
      g `v' = .
 }
 gen which = ""

 forval i = 1/`limit' {
         display "Iteration of `i' of `limit"
         replace which = "`: label (id) `i''" in `i'
         dfgls fcf if id == `i' , maxlag(4) ers
		 matrix results=r(results)
		 svmat results
         qui foreach v in k maic sic rmse DFGLS {
                replace `v' = r(`v') in `i'
		
         }
}


In this case, the matrix is 4x5, and the replace `v' command above creates 4 new rows. 

How would I modify this to create only one new row from the matrix?

Any ideas are greatly appreciated!

Thank you for your time and expertise!


Rick Francis


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