[R] Memory limit in Aggregate()

[peter dalgaard]

On Aug 2, 2011, at 17:10 , Guillaume wrote:

> Hi Peter,
> Thanks for your answer.
> I made a mistake in the script I copied.... sorry !
> 
> The description of the object : listX has 3 column, listBy has 4 column, and

So what is the contents of listBy? If they are all factors with 100 levels, then you're looking at a table with 10^8 entries...

> they have 9000 rows :
> 
> print(paste("ncol x ", length((listX))))
> print(paste("ncol By ", length((listBy))))
> print(paste("nrow ", length((listX[[1]]))))
> 
> [1];"ncol x  3"
> [1];"ncol By  4"
> [1];"nrow  9083"
> 
> It seems the "large" (=4) number of columns in listBy creates the
> troubles...
> 
> Thanks,
> Guillaume
> 
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
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