RE: [R] comparing a vactor of values in IF statement.

From: Ravi Varadhan <rvaradha_at_jhsph.edu>
Date: Sat 21 May 2005 - 04:09:04 EST


Both

V[V > 0.5] <- 1 - V[V > 0.5]

and

ifelse(V>0.5, 1-V,V)

should do it.

Ravi.



Ravi Varadhan, Ph.D.
Assistant Professor, The Center on Aging and Health Division of Geriatric Medicine and Gerontology Johns Hopkins University
Ph: (410) 502-2619
Fax: (410) 614-9625
Email: rvaradhan@jhmi.edu

> -----Original Message-----
> From: r-help-bounces@stat.math.ethz.ch [mailto:r-help-
> bounces@stat.math.ethz.ch] On Behalf Of Jagarlamudi, Choudary
> Sent: Friday, May 20, 2005 1:59 PM
> To: r-help@stat.math.ethz.ch
> Subject: [R] comparing a vactor of values in IF statement.
>
> Hi,
>
> my vector V<- c(1,0.5,0.06,0.056,0.01,0.04,0.4,0.9,0.82,0.1)
>
> if( V > 0.5) { V <- 1 - V }
>
> I get a warning saying only the first element will be used in comparing
> (if V > 0.5).
> However, my results tell me vis-versa ,it actually compares every element
> of the vector V with 0.5 and that is waht i want it to do.
> Using a for loop is expensive and time consuming since my actual vector is
> 15000 values.
>
> Any help to rectify the warning i get is appreciated.
>
> Thank You.
>
> Choudary Jagarlamudi
> Instructor
> Southwestern Oklahoma State University
> STF 254
> 100 campus Drive
> Weatherford OK 73096
> Tel 580-774-7136
>
> [[alternative HTML version deleted]]
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat May 21 04:16:50 2005

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