Hi, Gabor,

Thanks so much, I  will try it and let you know the results.

Appreciated!


On Wed, Jun 22, 2011 at 2:54 PM, Gabor Grothendieck <ggrothendieck@gmail.com
> wrote:

> On Wed, Jun 22, 2011 at 5:45 PM, Changbin Du <changbind@gmail.com> wrote:
> > HI, Dear R community,
> >
> > I have a large data set names dd.txt, the columns are: there are 2402
> > variables.
> >
> > a1, b1, ..z1, a11, b11, ...z11, a111, b111, ..z111..
> >
> > IF I dont know the relative position of the columns, but I know I need
> the
> > following variables:
> > var<-c(a1, c1,a11,b11,f111)
> >
> > Can I use read.columns to read the data into R?
> >
> > I have tried the following codes, but it does not work
> >
> > hh<-read.columns("/house/homedirs/c/cdu/operon/gh/dd.dimer",
> > required.col=NULL, text.to.search=var, sep="\t", skip=0, quote="",
> fill=T)
> >
>
> Depending on the precise format of the input you might be able to use
> read.csv.sql in sqldf.  (You may need to modify the args a bit
> relative to what is shown below but the basic idea is hopefully
> clear.)  See ?read.csv.sql and also the examples on the sqldf home
> page (http://sqldf.googlecode.com) for more info.
>
> library(sqldf)
> DF <- read.csv.sql("myfile", header = FALSE, sep = "\t", sql = "select
> a1,c1,a11,b11,f111 from file")
>
>
>
> --
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com
>



-- 
Sincerely,
Changbin
--

Changbin Du
DOE Joint Genome Institute
Bldg 400 Rm 457
2800 Mitchell Dr
Walnut Creet, CA 94598
Phone: 925-927-2856

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