[R] converting among modes

Martin Henry H. Stevens hstevens at muohio.edu
Fri Jul 27 19:38:35 CEST 2001

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
I use scan() and specify the data type (what=...), I get an error message
saying that I have character data in the numeric variable.

Any ideas are appreciated.

Thank you,

Martin Henry H. Stevens
HStevens at muohio.edu
tel: (513) 529 - 4206
FAX: (513) 529 - 4243

338 Pearson Hall
Botany Department
Miami University
Oxford, OH 45056

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