[R] Warning message with aggregate function

[Uwe Ligges]

Xingwang Ye wrote:
> Dear all,
> When I use aggregate function as:
> 
> attach(warpbreaks)
> aggregate(warpbreaks[, 1], list(wool = wool, tension = tension), sum)
> 
> The results are right but I get a warning message:
> "number of items to replace is not a multiple of replacement length."
> 
> BTW: I use R version 2.4.1 in Ubuntu 7.04.


Does not happen for me, neither with R-2.4.1 nor with recent versions of 
R. Maybe you have redefined one of the used objects (aggregate, 
warpbreaks, wool, tension, sum) in one of your environments?

BTW: Is is always a bad idea to make much use of attach()...

Uwe Ligges


> Your kind solutions will be great appreciated.
> 
> Best wishes
> 
> Yours, sincerely,
> Xingwang Ye
> 
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