[R-sig-teaching] Optimizing loop

[Albyn Jones]

Actually, this question should be re-directed to the R-Help list - it is
not about teaching with R.

albyn

On Thu, Feb 5, 2015 at 9:09 AM, Ulises M. Alvarez <uma at sophie.unam.mx>
wrote:

> On 02/05/2015 02:08 AM, Manel Amado Martí wrote:
>
>> I'm processing a table database. To do that, I put it in a dataframe, and
>> then I do the data processing (normalization of some fields). I'm used to
>> program in C, and some R's facilities are not so natural to me, please,
>> excuse me if the question is for "dummies".
>> In the processing, I want to substitute some field's value depending on
>> the previous content. For example, if field starts with a digit instead of
>> an alpha character, the entire field from the actual row, I'll replace it
>> with "SOLPD". I'm sure that would be another way (maybe through some apply
>> function), but I can't figure how to do.
>> The code that I'm using now, is:
>> for( i in 1:nrow(dataframe2)) {
>>          if(is.na(dataframe2[i,"NIF/NIE"])==FALSE){
>>                  if(str_locate(dataframe2[i,"NIF/NIE"],"\\d")[1]<2){
>>                          sprintf("elimina NIF aut�nom: % i\n",i)
>>                          dataframe2[i,"NIF"]<-"SLOPD"}
>>                  }
>>          }
>> }
>>
>> Thank you for your attention!
>>
>
> Hi:
>
> You may take a look at the dplyr library:
>
> https://github.com/hadley/dplyr
>
> If you provide a small, reproducible example, we may provide further help.
> --
> Ulises M. Alvarez
> http://sophie.unam.mx/
>
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> R-sig-teaching at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-sig-teaching
>

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