How to set a filter during reading tables

I think you can use readLines(n=1) in loop to skip unwanted rows.

On Mon, Jun 1, 2009 at 12:56 AM,  <guox at ucalgary.ca> wrote:

Thanks, Juliet.
It works for filtering columns.
I am also wondering if there is a way to filter rows.
Thanks again.
-james

One can use colClasses to set which columns get read in. For the
columns you don't
want you can set those to NULL. For example,

cc <- c("NULL",rep("numeric",9))

myData <-
read.table("myFile.txt",header=TRUE,colClasses=cc,nrow=numRows).


On Wed, May 27, 2009 at 12:27 PM, ??<guox at ucalgary.ca> wrote:

We are reading big tables, such as,

Chemicals <-
read.table('ftp://ftp.bls.gov/pub/time.series/wp/wp.data.7.Chemicals',header
= TRUE, sep = '\t', as.is =T)

I was wondering if it is possible to set a filter during loading so
that
we just load what we want not the whole table each time. Thanks,

-james