# [R] I don't understand the 'order' function

arun smartpink111 at yahoo.com
Tue Apr 16 19:59:06 CEST 2013

```Hi,
vec1<- c(2465, 2255, 2085, 1545, 1335, 1210, 920, 210, 210, 505, 1045)
vec1[order(vec1)]
#[1]  210  210  505  920 1045 1210 1335 1545 2085 2255 2465
order(vec1)
#[1]  8  9 10  7 11  6  5  4  3  2  1
sort(vec1,index.return=TRUE)
#\$x
#[1]  210  210  505  920 1045 1210 1335 1545 2085 2255 2465

#\$ix
# [1]  8  9 10  7 11  6  5  4  3  2  1
A.K.

----- Original Message -----
From: Julio Sergio <juliosergio at gmail.com>
To: r-help at stat.math.ethz.ch
Cc:
Sent: Tuesday, April 16, 2013 1:51 PM
Subject: [R] I don't understand the 'order' function

I thought I've understood the 'order' function, using simple examples like:

order(c(5,4,-2))
[1] 3 2 1

However, I arrived to the following example:

order(c(2465, 2255, 2085, 1545, 1335, 1210, 920, 210, 210, 505, 1045))
[1]  8  9 10  7 11  6  5  4  3  2  1

and I was completely perplexed!
Shouldn't the output vector be  11 10 9 8 7 6 4 1 2 3 5 ?
Do I have a damaged version of R?

I became still more astonished when I used the sort function and got the

sort(c(2465, 2255, 2085, 1545, 1335, 1210,  920,  210,  210,  505, 1045))
[1]  210  210  505  920 1045 1210 1335 1545 2085 2255 2465
since 'sort' documentation claims to be using 'order' to establish the right
order.

Thanks,

-Sergio.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help