[R] Select a set of rows based on a condition

[R. Michael Weylandt]

If you know the index letters are unique.

df <- data.frame(indx = LETTERS[1:7], levels = sample(7))

ind1 <- which(df$indx == "A")
ind2 <- which(df$indx == "B")

df[ind1:ind2, ]

Michael

On Wed, Dec 7, 2011 at 6:23 AM, RaoulD <raoul.t.dsouza at gmail.com> wrote:
> Hi,
>
> I need help with selecting a set of rows from a column in a dataset, that
> matches a string criteria - start and end. The dataset is :
>
> <variable Name>   <Value>
>   List|Index           10
>   ABC                  20
>   DEF                   10
>   GHI                   50
>   JKL                    40
>   MNO                  20
>   PQR                   10
>
> Start="DEF"
> End = "MNO"
>
> Ideally, I would like to select the data from DEF to MNO into a new data
> set. My logic is
> 1) get the row number for DEF
> 2) get the row number for MNO
> 3) subset the rows from DEF to MNO
>
> Can someone please help me with the R code for this as am a little rusty.
> Please let me know if you have questions.
>
> Thanks in advance!
> Raoul
>
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