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RE: st: Using foreach and forval to append data files


From   Tim Evans <[email protected]>
To   "[email protected]" <[email protected]>
Subject   RE: st: Using foreach and forval to append data files
Date   Tue, 26 Mar 2013 13:01:13 +0000

Maarten,

Thanks for this - very nice! Worked a treat.

Best wishes

Tim


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Maarten Buis
Sent: 26 March 2013 12:15
To: [email protected]
Subject: Re: st: Using foreach and forval to append data files

local k = 1
forval i = 1/6 {
    foreach j of numlist 1 2 8 {
        if `k' == 1 {
            use `i'_`j'_results
        }
        else {
            append using `i'_`j'_results
        }
        local k = `k' + 1
    }
}

Hope this helps,
Maarten

On Tue, Mar 26, 2013 at 1:07 PM, Tim Evans wrote:
> Using Stata 11.2, I've created 18 individual results sets that have the following naming schedule:
>
> 1_1_results.dta
> 1_2_results.dta
> 1_8_results.dta
> 2_1_results.dta
> 2_2_results.dta
> 2_8_results.dta
> 3_1_results.dta
> 3_2_results.dta
> 3_8_results.dta
>
> This continues until the first number reaches 6.
>
> What I am trying to achieve is an automated process of appending all data files and I was using the following code - but this adds a duplication of the file 1_1_results:
>
> use 1_1_results.dta, replace
> forval i = 1/6 {
> foreach j of numlist 1 2 8 {
> append using `i'_`j'_results
> }
> }
>
> I then tried this:
>
> use 1_1_results.dta, replace
> forval i = 2/6 {
> foreach j of numlist 1 2 8 {
> append using `i'_`j'_results
> }
> }
>
> Which I then realised that I miss out on any file named:
>
> 1_2_***
> 1_8_***
>
> Other than using the first loop and using -duplicates- to identify and then remove the duplicates, is there a more direct way of using and then appending datasets?
>
> Best wishes
>
> Tim
>
>
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-- 
---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------

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_DISCLAIMER:
This email and any attachments hereto contains proprietary information, some or all of which may be confidential or legally privileged. It is for the exclusive use of the intended recipient(s) only. If an addressing or transmission error has misdirected this e-mail and you are not the intended recipient(s), please notify the author by replying to this e-mail. If you are not the intended recipient you must not use, disclose, distribute, copy, print, or rely on this e-mail or any attachments, as this may be unlawful.


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