[R] Warning message with aggregate function

[Xingwang Ye]

Thank you for sharing your experience.
The example data I used is from help for "by" function, so every one 
could have a try.

After using $, the warning message disappeared:
aggregate(warbreaks[,1], list(wool = warbreaks$wool, 
tension=warbreaks$tension),sum)

Another approach may be to restart your R.

Xingwang Ye

Uwe Ligges wrote:
>
>
> 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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>