[R] Select a set of rows based on a condition
R. Michael Weylandt
michael.weylandt at gmail.com
Wed Dec 7 21:37:23 CET 2011
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")
On Wed, Dec 7, 2011 at 6:23 AM, RaoulD <raoul.t.dsouza at gmail.com> wrote:
> 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
> 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!
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