[R] Name of a column

[David Hugh-Jones]

1. You don't need to say  truc==T. truc is already a logical vector.

2. colnames are just another vector, so do

colnames(truc)[truc]

Dave

On 15/06/06, David Hajage <dhajage at gmail.com> 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.
>
> --
> David
>
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