questions about counting numbers

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It's not quite clear what the OP really wanted.  A more general solution may be:
a=c(4, 3, 2, 3)
ta <- table(a)
ta
a
2 3 4
1 2 1
ta[as.character(a)]
a
4 3 2 3
1 2 1 2

HTH
Ray Brownrigg
Hi Carrie,

Try

x <- rle(a)
rep(x$lengths, x$lengths)
[1] 1 2 2 1

HTH,
Jorge

On Sun, Feb 6, 2011 at 8:21 PM, Carrie Li <> wrote:
Hello R-helpers,

I have a question about counting numbers.
Here is a simple example.

a=c(2, 3, 3,4)

table(a)
a
2 3 4
1 2 1

so, I can to create another variables that has the corresponding counting
numbers.
In this case, I want to have:

b=c(1,2,2,1)

Is there any way coding for this ?

Thanks for helps!

Carrie--
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?ave
a
[1] 2 3 3 4
cbind(a, ave(a, a, FUN=length))
a
[1,] 2 1
[2,] 3 2
[3,] 3 2
[4,] 4 1

Hello R-helpers,

I have a question about counting numbers.
Here is a simple example.

a=c(2, 3, 3,4)
table(a)
a
2 3 4
1 2 1

so, I can to create another variables that has the corresponding counting
numbers.
In this case, I want to have:

b=c(1,2,2,1)

Is there any way coding for this ?

Thanks for helps!

Carrie--

? ? ? ?[[alternative HTML version deleted]]

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