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comparing a vactor of values in IF statement.
3 messages · Jagarlamudi, Choudary, Gabor Grothendieck, Ravi Varadhan
Try V <- ifelse(V > 0.5, 1-V, V) or V <- pmin(V, 1-V)
On 5/20/05, Jagarlamudi, Choudary <choudary.jagar at swosu.edu> wrote:
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
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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 at jhmi.edu --------------------------------------------------------------------------
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-
bounces at stat.math.ethz.ch] On Behalf Of Jagarlamudi, Choudary
Sent: Friday, May 20, 2005 1:59 PM
To: r-help at 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]]
______________________________________________ R-help at 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