question about subset

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-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA

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-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch 
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of jose silva
Sent: Thursday, May 05, 2005 3:31 PM
To: r-help at stat.math.ethz.ch
Subject: [R] question about subset

Dear R users:

I have a quick question:

is there any way to get a subset of a data frame with the 
ordered indexes or without these indexes?

example:

mydata<- data.frame(A=seq(1,10), B=c(-5,2,-4,6,-8,-9,2,5,7,0))
subset(mydata, B>0)
?? A B
2 2 2
4 4 6
7 7 2
8 8 5
9 9 7

I would like to obtain this:

?? A B
1 2 2
2 4 6
3 7 2
4 8 5
5 9 7

or this

?? A B
????2 2
????4 6
????7 2
????8 5
????9 7

I think this is possible but I dont know how...
any sugestion?
thanks

jose silva
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rois there any way to get a subset of a data frame with the ordered 
indexes or without these indexes?

example:

mydata<- data.frame(A=seq(1,10), B=c(-5,2,-4,6,-8,-9,2,5,7,0))
subset(mydata, B>0)
  A B
2 2 2
4 4 6
7 7 2
8 8 5
9 9 7

I would like to obtain this:

  A B
1 2 2
2 4 6
3 7 2
4 8 5
5 9 7

> x <- subset(mydata, B>0)
 > row.names(x) <- rank(x$A)
 > x
   A B
1 2 2
2 4 6
3 7 2
4 8 5
5 9 7
or this

  A B
  2 2
  4 6
  7 2
  8 5
  9 7

I think you already got this using subset.  The row.names can be used 
to set the row names to whatever you want.

Sean