R help - May 2012 - Help with ordering values

Hi,

Is it possible to use x and y below to produce the vector shown in
desired.result (which represents the values in y ordered according to
the order specified by x)? Ideally the solution must be efficient in
terms of timing as I'm dealing with *very* long vectors.


x <- c(7, 6, 5, 9, 4, 14, 8, 12, 10, 11, 2, 13, 3, 1)
y <- c(1, 2, 9, 8, 11)
desired.result <- c(9, 8, 11, 2, 1)

Thanks,
Lars.

Will
y[order(match(y,x))]
[1]  9  8 11  2  1
do?

Regards
S?ren

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Lars Bishop
Sent: 20. maj 2012 01:05
To: r-help at r-project.org
Subject: [R] Help with ordering values

Hi,

Is it possible to use x and y below to produce the vector shown in
desired.result (which represents the values in y ordered according to the order
specified by x)? Ideally the solution must be efficient in terms of timing as
I'm dealing with *very* long vectors.


x <- c(7, 6, 5, 9, 4, 14, 8, 12, 10, 11, 2, 13, 3, 1) y <- c(1, 2, 9, 8,
11) desired.result <- c(9, 8, 11, 2, 1)

Thanks,
Lars.

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