[R] R: Searching and deleting elements of list

[jastar]

This is exactly what I need
Thank's a lot!!



Guazzetti Stefano wrote:
> 
> you could try mapply
> 
>  mydata2<-mapply("[", mydata, lapply(mydata, function(x) !x %in% A))
>  mydata2[[1]]<-A  #to replace the obviously deleted elements of "A"
>  mydata2
>  mydata2[[1]]
>  mydata2[[2]]
>  mydata2[[3]]
>  mydata2[[4]]
> 
> Stefano
> 
> 
> -----Messaggio originale-----
> Da: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch]Per conto di jastar
> Inviato: giovedì 8 marzo 2007 12.31
> A: r-help at stat.math.ethz.ch
> Oggetto: [R] Searching and deleting elements of list
> 
> 
> 
> Hi,
> I have a problem. Please, look at example and try to help me!!
> 
>> A<-c("aaa","bbb","ccc","ddd","eee")
>> B<-c("vvv","ooo","aaa","eee","zzz","bbb")
>> C<-c("sss","jjj","ppp","ddd")
>> D<-c("bbb","ccc")
>>mydata=list(A,B,C,D)
> 
> I want to find and delete from 'mydata' all elements which occur in A
> (except A). 
> I mean after "operation":
>> mydata[[1]]
> [1] "aaa" "bbb" "ccc" "ddd" "eee"
>> mydata[[2]]
> [1] "vvv" "ooo" "zzz"
>> mydata[[3]]
> [1] "sss","jjj","ppp"
>> mydata[[4]]
> NULL
> 
> My list have about 10000 subelements (each contains several strings) so
> using loops is senseless.
> 
> Thank's for all replies and sorry for my English (I hope you understand
> what
> I'm talking about) :-)
>  
> -- 
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> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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