Thanks to all who respoded so promptly.
I received similar answers... here is one of them
-----Original Message-----
From: Chalvatzis, Dimitrios (Energy Wholesale)
[mailto:Dimitrios.Chalvatzis@eon-uk.com]
Sent: 08 September 2005 09:32
To: Costanzo, Simona
Subject: RE: [S] subscripting factors
Simona,
If your data frame is named DF then
DF$X2[DF$X1=="A"]
Dimitrios Chalvatzis
Risk Analyst
Energy Wholesale/Risk Policies & Methods
T +44 (0)24 7642 5429
F +44 (0)24 7642 5479
Dimitrios.Chalvatzis@eon-uk.com
-----Original Message-----
From: s-news-owner@lists.biostat.wustl.edu
[mailto:s-news-owner@lists.biostat.wustl.edu] On Behalf Of
simona.costanzo@ubs.com
Sent: Thursday, September 08, 2005 9:23 AM
To: s-news@lists.biostat.wustl.edu
Subject: [S] subscripting factors
Hi,
in a data.frame of the form
X1 X2
1 A 1
2 A 2
3 B 3
4 C 4
>
I would like to extract elements of X2, with X1="A". Where X1 is a
factor and X2 is a numeric vector.
Your help is very much appreciated
Thank you and kind regards,
Simona
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