[R] Repeat if

[Peter Dalgaard]

Birgit Lemcke wrote:
> Thanks that was really a quick answer.
>
> It works but I get this warning message anyway:
>
> 1: kein nicht-fehlendes Argument f�r min; gebe Inf zur�ck (None not- 
> lacking argument for min; give Inf back)
> 2: kein nicht-fehlendes Argument f�r max; gebe -Inf zur�ck
>
> what does this mean?
>
>   

Same as this

> max(c(NA, NA), na.rm=T)
[1] -Inf
Warning message:
no non-missing arguments to max; returning -Inf

which is related to the issues of empty sum(), prod(), any(), and all()
in that it allows a consistent concatenation rule:

max(c(x1,x2)) == max(max(x1), max(x2))

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