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

From: Ravi Varadhan <rvaradhan_at_jhmi.edu>
Date: Wed, 09 Apr 2008 14:37:18 -0400


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?  

Thanks for any help.



Ravi Varadhan, Ph.D.

Assistant Professor, The Center on Aging and Health

Division of Geriatric Medicine and Gerontology

Johns Hopkins University

Ph: (410) 502-2619

Fax: (410) 614-9625

Email: rvaradhan_at_jhmi.edu

Webpage: http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html  


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