[R] Simple order() data frame question.

From: John Kane <jrkrideau_at_yahoo.ca>
Date: Thu, 12 May 2011 05:32:48 -0700


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
>



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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 - 12:39:02 GMT

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