Message-ID: <430DAF6A.60301@helsinki.fi>
Date: 2005-08-25T11:45:46Z
From: Anon.
Subject: Converting characters to numbers in data frames
I'm sure I'm missing something obvious here, but I can't find the
solution (including in the FAQ etc.).
I have a vector of names of variables like this: NRes.x.y. where x and y
are numbers. I want to extract these numbers as numbers to use
elsewhere. I can extract the numbers as a list of characters using
strsplit(), and convert that to a data frame, e.g.:
NAMES=c("NRes.1.2.", "NRes.1.3.", "NRes.1.4.", "NRes.1.5.", "NRes.1.6.")
NUMBERS=strsplit(gsub("NRes.","", NAMES, perl =T), '.', fixed = TRUE)
NUMBERS.df=t(data.frame(NUMBERS))
But I now want to convert the characters to be numeric. Using
as.numeric(NUMBERS.df) converts them, but to a vector. How can I
convert and keep as a data frame? I could use this:
matrix(as.numeric(NUMBERS.df), ncol=dim(NUMBERS.df)[2])
but I seem to be jumping through far too many hoops: there must be an
easier way. An suggestions?
Bob
--
Bob O'Hara
Department of Mathematics and Statistics
P.O. Box 68 (Gustaf H??llstr??min katu 2b)
FIN-00014 University of Helsinki
Finland
Telephone: +358-9-191 51479
Mobile: +358 50 599 0540
Fax: +358-9-191 51400
WWW: http://www.RNI.Helsinki.FI/~boh/
Journal of Negative Results - EEB: www.jnr-eeb.org