[R] Creatng new variable based upon conditions

[Dénes Tóth]

On 07/26/2018 08:58 PM, JEFFERY REICHMAN wrote:
> Given something like ...
> 
> x <- c(3,2,4,3,5,4,3,2,4,5)
> y <- c("A","B","B","A","A","A","A","B","A","B")
> xy <- data.frame(x,y)
> xy$w <- ifelse(xy$y=="A",xy$w[,x]*10,xy$w[,x]*15 )

You should learn the basics about how to extract or replace part of an 
object, in particular data.frames. You can start by reading the help 
page of ?"Extract".

xy$w <- ifelse(xy$y=="A",xy$x*10,xy$x*15 )

HTH,
Denes


> 
> want to see
> 
>     x y  w
> 1  3 A 30
> 2  2 B  30
> 3  4 B  60
> 4  3 A  30
> 5  5 A  50
> 6  4 A  40
> 7  3 A  30
> 8  2 B  30
> 9  4 A  40
> 10 5 B  75
> 
> but I get NA's
> 
> Jeff
> 
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