Hello,

Try

which("B" == Mylist)

Hope this helps,

Rui Barradas
Em 11-09-2012 13:31, Rantony escreveu:
How can I get  index from a list if I know the listitem ?

For eg:- Mylist<-c("A","B","C")

Acually,Here I need to get the index of "B" as 2.

From: arun kirshna [via R]
[mailto:ml-node+s789695n4642756...@n4.nabble.com]
Sent: Tuesday, September 11, 2012 5:56 PM
To: Akkara, Antony (GE Energy, Non-GE)
Subject: Re: Searching from Dataframe.

Hi,
You can try this also:
df1<-read.table(text="
Name  Age  Place
Aby          12        USA
Raj            25        UK
Romi        32        ENG
Amy        31        IND
",sep="",header=TRUE,stringsAsFactor=FALSE)

#row index
unlist(apply(df1,1,function(x) which(grepl("ENG",x))))
#[1] 3
#column index
  unlist(apply(df1,2,function(x) which(grepl("ENG",x))))
#Place
   #  3
#or, you can use
  arrayInd(which(df1=="ENG"), dim(df1))
#     [,1] [,2]
#[1,]    3    3
#or
  df2<-as.matrix(df1)
  arrayInd(which(grepl("ENG",df2)), dim(df2))
#     [,1] [,2]
#[1,]    3    3

  A.K.

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