Message-ID: <Pine.LNX.4.31.0107271843360.1643-100000@gannet.stats>
Date: 2001-07-27T17:44:43Z
From: Brian Ripley
Subject: converting among modes
In-Reply-To: <01ff01c116c2$f6952300$c5093586@STEVENS>
On Fri, 27 Jul 2001, Martin Henry H. Stevens wrote:
> Windows 2000, R 1.3.0
>
> I have been given a data set (ASCII tab delimited) in which many variables
> that are supposed to be numeric actually contain characters. I would be
> happy to have those character entries disappear and become NA.
>
> When I use read.table and then attempt to convert these using as.numeric(),
> of course it doesn't work, and I get the ASCII? representation? maybe? When
Yes, `of course'. You need as.numeric(as.character()) since those columns
are factors. (See the FAQ item 7.13.)
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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