[R] Fetching a range of columns

[Adam D. I. Kramer]

Hi Jason,

data[] is a data frame, remember--you need to specify rows AND columns. So,
data[,c(2,12,17)] is what you should be doing in the first place, and
data[,842:2411] in the second place.

Not sure if the help you needed was using the comma, or the : syntax, or if
you're trying to read only certain columns during the read.csv process
(which I don't think that's possible).

--Adam

On Sun, 14 Sep 2008, Jason Thibodeau 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
>
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>
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