[R] efficient equivalent to read.csv / write.csv

Uwe Ligges
Sun, 26 Sep 2010 16:29:08 -0000

On 26.09.2010 14:38, statquant2 wrote:
>
> Hello everyone,
> I currently run R code that have to read 100 or more large csv files (>=
100
> Mo), and usually write csv too.
> My collegues and I like R very much but are a little bit ashtonished by how
> slow those functions are. We have looked on every argument of those
> functions and if specifying some parameters help a bit, this is still too
> slow.
> I am sure a lot of people have the same problem so I thought one of you
> would know a trick or a package that would help speeding this up a lot.
>
> (we work on LINUX Red Hat R 2.10.0 but I guess this is of no use for this
> pb)
>
> Thanks for reading this.
> Have a nice week end


Most of us read the csv file and write an Rdata file at once (see
?save). Then we can read in the data much quicker after they have been
imported once with read.csv and friends.

Uwe Ligges