Thanks John! Deepayan Sarkar also suggested this. I don't really expect
to see any better solution. Murray
John Fox wrote:
Dear Murray,
How about as.numeric(factor(y)) ?
I hope this helps,
John
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Murray
Jorgensen
Sent: Wednesday, October 25, 2006 7:13 PM
To: r-help@stat.math.ethz.ch
Subject: [R] Recoding categorical variables
I want to recode an integer-valued variable y so that its
values become 1:length(y). I can do this using a loop but
maybe someone can suggest code without a loop. My code is this:
y - round(20*runif(25))
table(y)
suy - sort(unique(y))
m - length(suy)
z - y + max(suy)
for(i in 1:m) z[y==suy[i]] - i
rbind(y,z)
(the recoded y is stored in z)
Murray Jorgensen
--
Dr Murray Jorgensen http://www.stats.waikato.ac.nz/Staff/maj.html
Department of Statistics, University of Waikato, Hamilton, New Zealand
Email: [EMAIL PROTECTED]Fax 7 838 4155
Phone +64 7 838 4773 wkHome +64 7 825 0441Mobile 021 1395 862
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--
Dr Murray Jorgensen http://www.stats.waikato.ac.nz/Staff/maj.html
Department of Statistics, University of Waikato, Hamilton, New Zealand
Email: [EMAIL PROTECTED]Fax 7 838 4155
Phone +64 7 838 4773 wkHome +64 7 825 0441Mobile 021 1395 862
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
