Re: a simple question--How to select subset of Dataframe in S-Plus

["Jonathan Dakin" <jdakin@overwey.demon.co.uk>]

dataset[x > 0 & y <0,]

 

selects all rows of the dataframe which satisfy.

 

Jonathan Dakin

-----Original Message-----
From: s-news-owner@lists.biostat.wustl.edu [mailto:s-news-owner@lists.biostat.wustl.edu] On Behalf Of Liu Zhigang
Sent: 29 May 2006 10:36
To: s-news@lists.biostat.wustl.edu
Subject: [S] a simple question--How to select subset of Dataframe in S-Plus

In SAS, I can use " if " to select my wanted observations.

For example, I want to select the obs satisfy the condition of  x>0 and y<0  (where x and y are variable in a dataset. )

and  operate  with   this subset.In SAS I can do if use following command:

 

[ If x>0 and y<0;  ]

 

But who can tell me how to make this select in S_Plus.

 

Thank you!

 

Liu zhigang

Jilin University