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# RE: st: Retrieving data from matrix

 From "Francis, Richard N" To "statalist@hsphsun2.harvard.edu" Subject RE: st: Retrieving data from matrix Date Mon, 2 Dec 2013 22:32:30 +0000

```Nick,

Thank you for your idea.

I used the following code, but now receive a syntax error (comment-out the svmat line, and the syntax error disappears):

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, names(iter `i'_)
qui foreach v in k maic sic rmse DFGLS {
replace `v' = r(`v') in `i'

}
}

What did I do wrong?

Rick Francis

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Monday, December 02, 2013 3:01 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Retrieving data from matrix

The error is coming from -svmat-. Consider that _second_ time around the loop -svmat- is trying to use the names for new variables that it used _first_ time around the loop. You must exploit the -name()- option to use different names each time around the loop. e.g.

svmat results, names(iter`i'_)
Nick
njcoxstata@gmail.com

On 2 December 2013 21:22, Francis, Richard N <rnfrancis@utep.edu> wrote:
> 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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```

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