Use the colClasses argument in combination with "NULL" for the columns you
don't want to read. For example, this code reads the first column as
character data and does not import the remaining 10 columns:

yourdata<-read.csv("yourdata.csv",colClasses=c(rep("character",3),rep("NULL",10)))

HTH, Mark Na


On Wed, Jun 17, 2009 at 2:59 PM, liujb <liujulia7@yahoo.com> wrote:

>
> Hello,
>
> I have a data file (.csv) that has a size of about 2.6 GB. I am not able to
> read in the whole data set because of the memory limit. I actually only
> need
> some columns (3 columns) of the data set, is there a way to read in
> specified columns?
>
> I am using windows.
>
> Thanks,
> Julia
> --
> View this message in context:
> http://www.nabble.com/how-to-read-in-only-some-columns-of-a-data-file-tp24081974p24081974.html
> Sent from the R help mailing list archive at Nabble.com.
>
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