[R] Searching from Dataframe.

[Rui Barradas]

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+s789695n4642756h74 at 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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