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

["Li Chuntao (Tony)" <leechtcn@gmail.com>]

My Suggestion is use macro functions to save the list of files into a
local macro

sample code as following:

clear

cd  filepath

local i: dir . file *

tokenize `"`i'"'


use `1', clear
local j=2

while `"``j''"'~="" {
append using  ``j''
 local j = `j'+1
  }


On Tue, Mar 26, 2013 at 9:01 PM, Tim Evans <Tim.Evans@wmciu.nhs.uk> wrote:
> 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
>>
>>
>> _DISCLAIMER:
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>>
>>
>> *
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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.
>
>
> *
> *   For searches and help try:
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