On Nov 15, 2009, at 10:01 AM, Grzes wrote:
I heve got a list:
lista=list()
a=c(2,4,5,5,6)
b=c(3,5,4,2)
c=c(1,1,1,8)
lista[[1]]=a
lista[[2]]=b
lista[[3]]=c
lista
[[1]]
[1] 2 4 5 5 6
[[2]]
[1] 3 5 4 2
[[3]]
[1] 1 1 1 8
I would like to know where is number 5 (which line)?
For example I have got a loop:
k= vector(mode = "integer", length = 3)
for(i in 1:3)
{
for (j in 1:length(lista[[i]])){
if ((lista[[i]][j])==5 k[i]= [i])
}
}
This loop is wrong but I would like to get in my vector k sth like
this:
k = lista[[1]][1], lista[[2]][1] ...or sth similar
I am a bit confused, since clearly lista[[1]][1] does _not_ == 5. It's
also unclear what type of output you expect ... character, list,
numeric?
See if these take you any further to your vaguely expressed goal:
> lapply(lista, "%in%", 5)
[[1]]
[1] FALSE FALSE TRUE TRUE FALSE
[[2]]
[1] FALSE TRUE FALSE FALSE
[[3]]
[1] FALSE FALSE FALSE FALSE
> lapply(lista, function(x) which(x == 5) )
[[1]]
[1] 3 4
[[2]]
[1] 2
[[3]]
integer(0)
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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