if else in R
Hi, This would be an issue with if() as well as if/else. ab$b has 4 numbers in it, so ab$b > 0 evaluates to "TRUE TRUE FALSE TRUE" or whatever. if() can only take a single true or false. Cheers! Nick
On Tue, Nov 19, 2013 at 8:30 PM, Gary Dong <pdxgary163 at gmail.com> wrote:
Dear R users,
I am a R beginner and I am having trouble in using "If Else" in R. Here is
an example:
## create a data frame
a<-c(1,2,3,4)
b<-c(2,0,5,0)
ab<-data.frame(cbind(a,b))
##calculate c, which is the ratio between a and b
if(ab$b>0) {
ab$c<-ab$a/ab$b
} else {
ab$c<-0
}
here is the error I got:
Warning message:
In if (ab$b > 0) { :
the condition has length > 1 and only the first element will be used.
Any help is appreciated!
Gary
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