Try
> foo <- data.frame(oid = 1:3, functions = c("mean", "sum", "sd"), type =
> c(TRUE, FALSE, TRUE))
> foo
oid functions type
1 1 mean TRUE
2 2 sum FALSE
3 3 sd TRUE
> foo == "sum"
oid functions type
[1,] FALSE FALSE FALSE
[2,] FALSE TRUE FALSE
[3,] FALSE FALSE FALSE
> which(foo == "sum", arr.ind = TRUE)
row col
[1,] 2 2
>
But can one risk this to fail if the class of some of the columns cannot be
compared to a string?????
Yours sincerely / Med venlig hilsen
Frede Aakmann Tøgersen
Specialist, M.Sc., Ph.D.
Plant Performance & Modeling
Technology & Service Solutions
T +45 9730 5135
M +45 2547 6050
fr...@vestas.com
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> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
> On Behalf Of carol white
> Sent: 30. april 2014 13:42
> To: r-h...@stat.math.ethz.ch
> Subject: [R] position of a string in a data frame
>
> Hi,
> It might be a primitive question but how to find the position of a string in a
> data frame? Suppose I search the word "sum" (case insensitive) in a data
> frame and it is in the 7th row, 3rd column, how to retrieve the indices 7, 3?
> I
> tried to use grep with tapply but it doesn't work.
>
> Many thanks
>
> Carol
>
> [[alternative HTML version deleted]]
>
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> guide.html
> and provide commented, minimal, self-contained, reproducible code.
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