[R] R: Searching and deleting elements of list

[Guazzetti Stefano]

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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