How to set a filter during reading tables
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
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.