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

From: <ctu_at_bigred.unl.edu>
Date: Sun, 06 Jul 2008 05:08:15 -0500

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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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Sun 06 Jul 2008 - 10:12:45 GMT

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