Depends on what you mean by "export".  I like save().  Check out the 
options in the help.  It seems to be very efficient and I had no 
problems working with the 50,000 x 15,000 data sets from the 2009 KDD 
Cup challenge.  Maybe your disk is just slow (network file storage)?

Allan.

On 29/06/09 07:51, DrDimo wrote:
> Hi all,
>
> I am currently working on a particularly large (data wise) project, the
> problem I am having is with exporting the data (for use later on). My
> current sample dataset contains about 400million entries (approximately
> 20000 columns  x 20000 rows). I tried using the write.table command, but 8
> hours later its still going. I will be trying write.matrix (MASS) next as it
> is supposed to handle things a bit quicker, but I thought I would ask if
> anyone has had experience with exporting large datasets and what is the
> quickest method to do so.
>
> Thanks in advance
>
> -Dmitri
>    

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