On 18/12/2010 8:34 AM, Luca Meyer wrote:
I am running this small program:
x<- factor(c("A","B","A","C"))
y<- c(1,2,3,4)
w<-data.frame(x,y)
if (w$x=="A"){
w$z=1
}
w
And I obtain:
x y z
1 A 1 1
2 B 2 1
3 A 3 1
4 C 4 1
And not
x y z
1 A 1 1
2 B 2 NA
3 A 3 1
4 C 4 NA
Like I should obtain. What am I doing wrong?
You're using "if", which only looks at the first element (as the message
said). See ?ifelse for a conditional that applies to each vector entry.
Duncan Murdoch
Please notice that I get a warning approximately saying - translated from
italian:
In if (w$x == "A") { : the condition length> 1 and only the first element will
be used
Thanks,
Luca
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
