help to select a data.frame in fuction of ID

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Gianni,

Is this what you are looking for?

mydata$limit2 <- mydata$limit * 2
mydata[mydata$H > mydata$limit2, ]

Robert

On Thu, Oct 21, 2010 at 9:06 AM, gianni lavaredo
Dear Researchers,

sorry If I ask a simple question, but this night I have no idea to resolv
this question. I have a data.frame (just a simple example)

mydata <- data.frame(id=c(1,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,5),
H=c(1,30,43,67,33,78,90,45,4,8,34,3,82,94,12,15,62,89,3,56,96,3),
limit=c(4,4,4,4,4,3,3,3,3,6,6,6,6,7,7,7,7,8,8,8,8,8))

i wish to select by "id" the row with "H" value >= of the boulde of limit (H
= limit*2) to have a new data.frame
mydata
? id ?H limit limit2
2 ? 1 30 ? ? 4 ? ? ?8
3 ? 1 43 ? ? 4 ? ? ?8
4 ? 1 67 ? ? 4 ? ? ?8
5 ? 1 33 ? ? 4 ? ? ?8
6 ? 2 78 ? ? 3 ? ? ?6
7 ? 2 90 ? ? 3 ? ? ?6
8 ? 2 45 ? ? 3 ? ? ?6
11 ?3 34 ? ? 6 ? ? 12
13 ?3 82 ? ? 6 ? ? 12
14 ?4 94 ? ? 7 ? ? 14
16 ?4 15 ? ? 7 ? ? 14
17 ?4 62 ? ? 7 ? ? 14
18 ?5 89 ? ? 8 ? ? 16
20 ?5 56 ? ? 8 ? ? 16
21 ?5 96 ? ? 8 ? ? 16

thanks and sorry for desturb with easy question

gianni

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