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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