[R] Need advise in grab the line number of sorted list in R

From: Jason Lee <huajie.lee_at_gmail.com>
Date: Mon, 02 Jun 2008 23:45:39 +1000


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


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.

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