Re: [R] Skipping specified rows in scan or read.table

From: Paul Smith <phhs80_at_gmail.com>
Date: Sun, 13 Apr 2008 09:50:44 +0100

On Wed, Apr 9, 2008 at 7:37 PM, Ravi Varadhan <rvaradhan_at_jhmi.edu> wrote:
> I have a data file, certain lines of which are character fields. I would
> like to skip these rows, and read the data file as a numeric data frame. I
> know that I can skip lines at the beginning with read.table and scan, but is
> there a way to skip a specified sequence of lines (e.g., 1, 2, 10, 11, 19,
> 20, 28, 29, etc.) ?
>
> If I read the entire data file, and then delete the character fields, the
> values are still kept as factors, with each value denoted by its level.
> Since, I have continuous variables, there are as many levels as there are
> values. I am unable to coerce this to "numeric" mode. Is there a way to do
> this so that I can then manipulate the numeric data frame?

Read the entire data file to the data frame mydata, and then delete the character fields. Afterwards,

mydata <- edit(mydata)

and, inside edit, coerce the columns that you want to numeric.

Paul



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