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

[Tim Evans <Tim.Evans@wmciu.nhs.uk>]

Maarten,

Thanks for this - very nice! Worked a treat.

Best wishes

Tim


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten Buis
Sent: 26 March 2013 12:15
To: statalist@hsphsun2.harvard.edu
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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*   http://www.ats.ucla.edu/stat/stata/