On Mar 15, 2011, at 1:11 PM, <rex.dw...@syngenta.com> wrote:
I think you need to read an introduction to R.
For starters, read.table returns its results as a value, which you
are not saving.
The probable answer to your question:
Read the whole file with read.table, and select columns you need,
e.g.:
tab <- read.table(myfile, skip=2)[,1:5]
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org
] On Behalf Of Luis Ridao
Sent: Tuesday, March 15, 2011 11:53 AM
To: r-help@r-project.org
Subject: [R] How to read only specified columns from a data file
R-help,
I'm trying to read a data file with plenty of columns.
I just need the first 5 but it doe not work by doing something like:
mycols <- rep(NULL, 430) ; mycols[c(1:4)] <- NA
read.table(myfile, skip=2, colClasses=mycols)
I would have suggested:
mycols <- rep(NULL, 430) ; mycols[1:5] <- rep("numeric", 5)
inp <- read.table(myfile, skip=2, colClasses=mycols)
head(inp)
--
David.
Any suggestions?
Thanks in advance
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David Winsemius, MD
West Hartford, CT
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