[R] [Requires Classification] Re: Subset function: selecting variables within a factor

[Andrew McFadden]

Hey Thomas Thanks mate

I knew there had to be an easy answer. Thanks for coming to my rescue.

Regards

Andrew McFadden MVS BVSc | Incursion Investigator (animals), 
Investigation and Diagnostic Centre | Biosecurity New Zealand
Ministry of Agriculture and Forestry | 66 Ward St,  Wallaceville | PO
Box 40 742 | Upper Hutt | New Zealand 
Telephone: 64-4-894 5611 | Facsimile: 64-4-894 4973| Mobile:
027-733-1791 | Web: www.maf.govt.nz


-----Original Message-----
From: Thomas Lumley [mailto:tlumley at u.washington.edu] 
Sent: Tuesday, 14 April 2009 3:29 p.m.
To: Andrew McFadden
Cc: r-help at r-project.org
Subject: [Requires Classification] Re: [R] Subset function: selecting
variables within a factor

On Tue, 14 Apr 2009, Andrew McFadden wrote:

> Hi all
>
> I know this must be an easy one so sorry for the trouble. I would like

> to select a list of variables within a factor The following example is

> given in help for subset:
>
> subset(airquality, Temp  > 80 select = c(Ozone, Temp))
>
> So how do I select all temperatures of 90 and 80 ie Temp = c(80,90)


subset(airquality, Temp %in% c(80,90))

    -thomas

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle


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