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# Re: st: St: loop within a loop

 From Nick Cox To "statalist@hsphsun2.harvard.edu" Subject Re: st: St: loop within a loop Date Tue, 30 Apr 2013 16:29:45 +0100

```Further, this is not a problem in nested loops; the loops are parallel.
Nick
njcoxstata@gmail.com

On 30 April 2013 16:27, Nick Cox <njcoxstata@gmail.com> wrote:
> Not so. Second time round the inner loop, -generate- will fail as
> `varname' already exists.
>
> Also, eth = `mynum' needs to use == not =.
> Nick
> njcoxstata@gmail.com
>
>
> On 30 April 2013 16:22, Christopher Zbrozek <zbrozek@gmail.com> wrote:
>> Hi Adam,
>>
>> Something along these lines should work:
>>
>> foreach varname in "white" "black" "hispanic" "asian" "mixed" {
>>     forvalues mynum = 1/5 {
>>         gen `varname' = 0
>>         replace `varname' = 1 if eth = `mynum'
>>     }
>> }
>>
>> Best,
>> Christopher Zbrozek
>>
>> On Tue, Apr 30, 2013 at 11:17 AM, Adam Guerrero <adamgue@gmail.com> wrote:
>>> Hello,
>>>
>>> I am trying to create a loop within a loop for the following block of
>>> code (loop through variables white, black, hispanic, asian, and mixed
>>> from values 1 to 5):
>>>
>>> replace white=1 if eth==1
>>> generate black=0
>>> replace black=1 if eth==2
>>> generate hispanic=0
>>> replace hispanic=1 if eth==3
>>> generate asian=0
>>> replace asian=1 if eth==4
>>> generate mixed=0
>>> replace mixed=1 if eth==5
>>>
>>> I know decode would be easier, but please consider responding to help
>>> me out learning how to loop.
>>>
>>> I'm relatively new to Stata, so any suggestions would be very much appreciated.
>>>
>>> Thank you in advance,
>>>
>>> Adam Guerrero
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```

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