Re: [R] Name of a column

From: Chuck Cleland <ccleland_at_optonline.net>
Date: Fri 16 Jun 2006 - 03:04:32 EST

X <- as.logical(rep(c(0,1), each=13))

names(X) <- LETTERS

which(X)
  N O P Q R S T U V W X Y Z
14 15 16 17 18 19 20 21 22 23 24 25 26

names(which(X))
  [1] "N" "O" "P" "Q" "R" "S" "T" "U" "V" "W" "X" "Y" "Z"

?which

David Hajage wrote:
> Hello,
>
> My problem is quite simply, but I didn't find any solution...
>
> I have a vector :
>

>> truc

> longueur30 longueur40 longueur50 longueur60 longueur70 longueur80
> longueur90
> 34 FALSE FALSE FALSE FALSE TRUE FALSE
> FALSE
>
> I would like to have the name of the column where there is "TRUE".
>
>> colnames(truc)

> [1] "longueur30" "longueur40" "longueur50" "longueur60" "longueur70"
> [6] "longueur80" "longueur90"
>
>> truc[truc == T]

> [1] TRUE
>
>> colnames(truc[truc == T])

> NULL
>
> How can I do it ?
>
> Thank you for your help.
>
-- 
Chuck Cleland, Ph.D.
NDRI, Inc.
71 West 23rd Street, 8th floor
New York, NY 10010
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Received on Fri Jun 16 03:25:25 2006

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