[R] looking for alternative of 'if-else'

ctu at bigred.unl.edu ctu at bigred.unl.edu
Sun Jul 6 12:08:15 CEST 2008

Why don't you try "switch" Let me assume that you want to calculate  
a=3 and b =5 by using one of "MEAN", "SUM","MIN", and "MAX functions.  
Then you could write your code: (If you want to calculate "MEAN")

> example<-function(fun=c("MEAN", "SUM", "MIN", "MAX")){
+   fun<-match.arg(fun);a=3;b=5
+   switch(  fun,
+            MEAN=(a+b)/2,
+            SUM=a+b,
+            MIN=min(a,b),
+            MAX=max(a,b))
+            }
>             example("MEAN")
[1] 4
Hope this is helpful,
Chunhao Tu

Quoting Arun Kumar Saha <arun.kumar.saha at gmail.com>:

> There is "if-else" loop if I have to choose 1 item from a 2-item list.
> However if I have a list of 4 items (let say) then how i can choose a single
> item without employing 'if-else' loop? I mean in VBA I can use
> "select-case", is there any equivalent in R as well?
> Regards,
> 	[[alternative HTML version deleted]]
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