Jim, this is a GREAT help. I was trying something similar before, but I was
unable to detect EOF. Thanks for the help!
Also, David, your suggestion worked perfectly.
Thanks for all the help, everyone!
On Sun, Sep 14, 2008 at 2:08 PM, jim holtman <[EMAIL PROTECTED]> wrote:
> Have you tried:
>
> data_filter <- data[842:2411]
>
> Also if you have a lot of data to read, I would suggest that you use a
> connection, and it all the data is numeric, possibly 'scan'. If you
> do use a connection, this would eliminate having to 'skip' each time
> which could be time consuming on a large file. Since it appears that
> you are not writing out the column names in the output file, you could
> bypass the header line on the file by readLine after the open. So
> something like this might work:
>
> input <- file('yourfile','r')
> invisible(readLines(input, n=1)) # skip the header
> while (TRUE){ # read file
> x <- try(read.csv(input, n=320, header=FALSE), silent=TRUE) # catch EOF
> if (inherits(x, 'try-error')) break
> write.csv(.......)
> }
>
>
>
> On Sun, Sep 14, 2008 at 12:22 PM, Jason Thibodeau <[EMAIL PROTECTED]>
> wrote:
> > Hello,
> >
> > I realize that using: x[x > 3 & x < 5] I can fetch all elements between 3
> > and 5. However I read in from a CSV file, and I would like to fetch all
> > columns from within a range ( 842-2411). In teh past, I have done this to
> > fetch just select few columns:
> >
> > data <- read.csv(filein, header=TRUE, nrows=320, skip=nskip)
> > data_filter <- data[c(2,12,17)]
> > write.table(data_filter, fileout, append = TRUE,
> > sep= ",", row.names= FALSE, col.names = FALSE)
> > nskip <- nskip+320
> >
> > This time, however, instead of grabbing columns 2, 12, 17, I woudl like
> all
> > columns in the range of 842-2411. I can't seem to do this correctly.
> Could
> > somebody please provide some insight? Thanks in advance.
> >
> > --
> > Jason Thibodeau
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@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.
> >
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem that you are trying to solve?
>
--
Jason Thibodeau
[[alternative HTML version deleted]]
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