Re: [R] Simple order() data frame question.

From: Nick Sabbe <nick.sabbe_at_ugent.be>
Date: Thu, 12 May 2011 14:50:29 +0200

Try
(df1[order(-df1[,2]),])
Adding the minus within the [ leaves out the column (in this case column 2). See ?"[".

HTH. Nick Sabbe

--
ping: nick.sabbe_at_ugent.be
link: http://biomath.ugent.be
wink: A1.056, Coupure Links 653, 9000 Gent
ring: 09/264.59.36

-- Do Not Disapprove




-----Original Message-----
From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org] On
Behalf Of John Kane
Sent: donderdag 12 mei 2011 14:33
To: R R-help
Subject: [R] Simple order() data frame question.

Clearly, I don't understand what order() is doing and as ususl the help for
order seems to only confuse me more. For some reason I just don't follow the
examples there. I must be missing something about the data frame sort there
but what?

I originally wanted to  reverse-order my data frame df1 (see below) by aa (a
factor) but since this was not working I decided to simplify and order by bb
to see what was haqppening!!

I'm obviously doing something stupid but what? 

(df1 <- data.frame(aa=letters[1:10],
     bb=rnorm(10)))
# Order in acending order by bb
(df1[order(df1[,2]),] ) # seems to work fine

# Order in decending order by bb.
(df1[order(df1[,-2]),])  # does not seem to work


===============================================================
 sessionInfo()
R version 2.13.0 (2011-04-13)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:

[1] LC_COLLATE=English_Canada.1252 LC_CTYPE=English_Canada.1252
LC_MONETARY=English_Canada.1252
[4] LC_NUMERIC=C LC_TIME=English_Canada.1252
attached base packages: [1] grid grDevices datasets splines graphics stats tcltk utils methods base other attached packages:
[1] ggplot2_0.8.9 proto_0.3-9.2 reshape_0.8.4 plyr_1.5.2
svSocket_0.9-51 TinnR_1.0.3 R2HTML_2.2
[8] Hmisc_3.8-3 survival_2.36-9
loaded via a namespace (and not attached):
[1] cluster_1.13.3 lattice_0.19-26 svMisc_0.9-61 tools_2.13.0
> ______________________________________________ R-help_at_r-project.org 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. ______________________________________________ R-help_at_r-project.org 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.
Received on Thu 12 May 2011 - 12:59:49 GMT

This quarter's messages: by month, or sorted: [ by date ] [ by thread ] [ by subject ] [ by author ]

All messages

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Thu 12 May 2011 - 13:20:06 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive