R switch() how to compare cases to a vector?

Question

I\'ve got a little issue with the switch statement in R. The following code is OK ... :

    value = \"B\"
  switch(value, 
         \"A\"={
           print(\"         


        

Answer 1

The == operator works on vectors, so what you need is just:

> a <- c("A", "B", "C")
> a
[1] "A" "B" "C"
> b <- "B"
> b == a
[1] FALSE  TRUE FALSE

Alternatively, you can use which

> which(a == b)
[1] 2

Note that can return several elements if a contains more than one instance of b

You can then proceed using an if or ifelse or switch statement on the result.

PS: you should avoid using list as a variable name, as it is a standard function in R