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Re: st: forval query


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: forval query
Date   Fri, 5 Apr 2013 15:26:07 +0100

Maarten's code can be automated one step further

unab stubs : r2*
local stubs : subinstr local stubs "r2" "", all

forvalues i = 2/10 {
    local j = 1990 + (2*`i')
    foreach stub of local stubs {
        rename r`i'`stub' `stub'_`j'
    }
}

The double loop can be shortened, at the risk of some loss of clarity

forvalues i = 2/10 {
    foreach stub of local stubs {
        rename r`i'`stub' `stub'_`= 1990 + 2*`i''
    }
}


Nick
njcoxstata@gmail.com


On 5 April 2013 15:20, Maarten Buis <maartenlbuis@gmail.com> wrote:
> On Fri, Apr 5, 2013 at 4:13 PM, Mirnezami, Oliver  wrote:
>> I can repeat your set of commands for each variable e.g.
>>
>> forvalues i = 2/10 {
>>     local j = 1990 + (2*`i')
>>     rename r`i'mobila mobila_`j'
>>         ma drop j
>> }
>>
>>
>> forvalues i = 2/10 {
>>     local j = 1990 + (2*`i')
>>     rename r`i'lgmusa lgmusa_`j'
>>         ma drop j
>> }
>>
>> Etc.
>>
>> However, I have do this for many variables so can you plug in a line with a list of these variables to avoid repeating the command over and over again?
>
> local stubs "mobila lgmusa"
>
> forvalues i = 2/10 {
>     local j = 1990 + (2*`i')
>     foreach stub of local stubs {
>         rename r`i'`stub' `stub'_`j'
>     }
> }
>
> -- Maarten
>
> ---------------------------------
> Maarten L. Buis
> WZB
> Reichpietschufer 50
> 10785 Berlin
> Germany
>
> http://www.maartenbuis.nl
> ---------------------------------
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