From: John Wilkinson (pipex) <wilks_at_dial.pipex.com>

Date: Sun 16 Oct 2005 - 23:54:03 EST

"Leaf Sun" wrote---

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57.2 23.4 34

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22 24 4.3

...

57.2 23.4 34

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 Received on Sun Oct 16 23:50:39 2005

Date: Sun 16 Oct 2005 - 23:54:03 EST

Leaf,

using your example data as 'dat' below --

dat<-read.table("clipboard",header=T)

dat

X Y Z

1 22.0 24.0 4.3 2 2.3 3.4 5.3 3 57.2 23.4 34.0

#to order the data frame by say X (for column 1)--

dat1<-dat[order(dat[,1]),]

dat1

X Y Z

2 2.3 3.4 5.3 1 22.0 24.0 4.3 3 57.2 23.4 34.0 --------------------------------------------By way of interest if you wanted to order EVERY column in ascending order then you could do a loop ---

# to order all cols of dat by rows (ascending)

dat2<-dat

for (i in 1:3) dat2[,i]<-dat[order(dat[,i]),i]
dat2

X Y Z

1 2.3 3.4 4.3 2 22.0 23.4 5.3 3 57.2 24.0 34.0 ------------------------------------------------

I hope that helps,

John

"Leaf Sun" wrote---

Dear all,

I have a date frame like this:

X Y Z

22 24 4.3 2.3 3.4 5.3

57.2 23.4 34

What my purpose is: to sort the data frame by either X, Y or Z. sample output is (sorted by X) :

X Y Z

2.3 3.4 5.3

22 24 4.3

...

57.2 23.4 34

I have no idea how to use sort, order or rank functions. Please help me out. Thanks!

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 Received on Sun Oct 16 23:50:39 2005

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