[R] Dataset size in R

Uwe Ligges ligges at statistik.uni-dortmund.de
Thu Sep 1 14:26:59 CEST 2005

Peter.Watkins at foodscience.afisc.csiro.au wrote:

> Dear listers,
> I would like to know whether a maximum size is set for data sets in R.

Well, in theory, there are some limits re. size of some integers, but 
you are far away, as far as I understand.

In practice, you will somewhere hit the limit of available memory in 
your machine.

> I'm planning on analysing data sets which have 330000 points for a
> sample. The response is from GCxGC output.

I don't understand this point:
How many observations and how many variables?

> Also, with data analysis, is there a time-cost saving by performing the
> analysis in Linux as against doing it in Windows XP?

Depends on the problem. For really huge data, you might want to use a 
"64bit machine", 64bit adressing for a single R process is (yet) only 
supported on Linux. If memory does not matter, Linux is sometimes a bit 
faster, but it depends also on other facts like using CPU optimized 
linear algebra systems such as ATLAS or Goto's BLAS.

Uwe Ligges

> Many thanks, Peter
> 	[[alternative HTML version deleted]]
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