ifelse()
Take it in a couple of steps. 'ifelse' will take the evaluation of a logical vector (first parameter) and return it second parameter if TRUE or the third parameter if FALSE:
X<-c(2,2,1,1,0,0) X > 0
[1] TRUE TRUE TRUE TRUE FALSE FALSE
ifelse(X > 0, 1,0)
[1] 1 1 1 1 0 0
Now the second and third parameters can also be vectors and the corresponding value will be chosen:
ifelse(X > 0, 1:6, 11:16)
[1] 1 2 3 4 15 16
HTH
On Tue, Feb 10, 2009 at 4:44 PM, kayj <kjaja27 at yahoo.com> wrote:
I have a problem with ifelse(), I do not understand how it works.
X<-c(2,2,1,1,0,0) str(X)
num [1:6] 2 2 1 1 0 0
Y<-ifelse(X>0,1,0) Y
[1] 1 1 1 1 0 0
Can some one explain what is going on, I do not understand what ifelse is doing in this case. Can someone explain the output Y. Thanks -- View this message in context: http://www.nabble.com/ifelse%28%29-tp21943308p21943308.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve?