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+s789695n4642756h74@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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