From: Jason Lee <huajie.lee_at_gmail.com>

Date: Tue, 03 Jun 2008 10:37:33 +1000

R-help_at_r-project.org mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Tue 03 Jun 2008 - 00:50:05 GMT

Date: Tue, 03 Jun 2008 10:37:33 +1000

Hi,

131 22.2 3.4 4.4 132 20.0 3.4 4.4==>Position 2 if queried 150 20.0 12.2 4.5 =>Position 3 if queried 134 20.0 3.4 4.4 ==> Position4 if queried 159 20.0 12.2 4.5==>Position 5 if queried 160 22.0 12.2 4.5

Is there any R package which I can use for the above calculation?

On Tue, Jun 3, 2008 at 12:02 AM, Marc Schwartz <marc_schwartz_at_comcast.net> wrote:

> on 06/02/2008 08:45 AM Jason Lee wrote:

*>
**>> Hi,
**>>
**>> I have a data frame which format is like below:-
**>>
**>> X Y Z
**>> 131 22.2 3.4 4.4
**>> 150 20.0 12.2 4.5
**>>
**>> etc...
**>>
**>> And I have sorted the data frame. However, I would like to grab one of
**>> these
**>> elements in the data frame. Also, i would like to number these rows so
**>> that
**>> when i grab a particular line let say 150, it is able to return me the
**>> position of the row rather than the "150". Let say in this example, when i
**>> grab a value of 150, it gives me 2 rather than 150.
**>>
**>>
**>> I tried to add anohter extra column of number which is data$NUMBER =
**>> row.names(data) on the sorted data but it seems not giving what I wanted
**>> which is the "position" of the row 150.
**>>
**>> Please advise. Thanks.
**>>
**>
**> Is this what you want?
**>
**> > DF
**> X Y Z
**> 131 22.2 3.4 4.4
**> 150 20.0 12.2 4.5
**>
**>
**> > which(row.names(DF) == 150)
**> [1] 2
**>
**>
**> See ?which
**>
**> HTH,
**>
**> Marc Schwartz
**>
**>
*

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