[R-SIG-Mac] R code not working under R version 2.13 for Mac

Berend Hasselman bhh at xs4all.nl
Sat Jul 9 20:13:21 CEST 2011

On 09-07-2011, at 19:12, Luca Meyer wrote:

> Thanks Jeff,
> I have extracted the first 50 lines of the d4 data.frame and put them into the attached d4a.RData file. In case the list handler does not allow attachments I have uploaded a copy of the file onto my web site and it can be downloaded from: http://www.lucameyer.com/d4a.RData
> Please notice that what I am trying to do is to aggregate over d4a$progetto and get a sum of d4a$ore. The error I get states:
> Error in units == units[1L] : comparison between these types has not been implemented
> Can you or anyone on the list spot what the matter could be for me? 

By trial and error 



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