R help - Oct 2011 - Counting the number of integers at one swoop

Dear R users,

I'd like to count the number of integers in a vector y.

Here is an example.

y <- c(0,1,1,3,3,3,5,5,6)

In fact, I know how to count the number of specific number in y.

sum(y==0) -> 1
sum(y==1) -> 2
sum(y==2) -> 0
sum(y==3) -> 3
sum(y==4) -> 0
sum(y==5) -> 2
sum(y==6) -> 1


However, in one computation I want to get this vector [1,2,0,3,0,2,1]. 

Thank you in advance.

Kathie



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I think there must be an easier solution, but this works:

y <- c(0,1,1,3,3,3,5,5,6)
x<-matrix(0:6,ncol=1)
apply(x,1,function(x){length(y[y==x])})

HTH,
Daniel




Kathie wrote:
> 
> Dear R users,
> 
> I'd like to count the number of integers in a vector y.
> 
> Here is an example.
> 
> y <- c(0,1,1,3,3,3,5,5,6)
> 
> In fact, I know how to count the number of specific number in y.
> 
> sum(y==0) -> 1
> sum(y==1) -> 2
> sum(y==2) -> 0
> sum(y==3) -> 3
> sum(y==4) -> 0
> sum(y==5) -> 2
> sum(y==6) -> 1
> 
> 
> However, in one computation I want to get this vector [1,2,0,3,0,2,1]. 
> 
> Thank you in advance.
> 
> Kathie
> 
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View this message in context:
http://r.789695.n4.nabble.com/Counting-the-number-of-integers-at-one-swoop-tp3901215p3901356.html
Sent from the R help mailing list archive at Nabble.com.

Table() or more generally tabulate()

Though, as a general warning, you may need to be a little careful
depending on the source of your data. Once you get into floating point
business, the definition of an integer becomes a little less cut and
dry. If your data are all integer, the data type, then there's nothing
to worry about.

Michael

On Thu, Oct 13, 2011 at 7:33 AM, Kathie <kathryn.lord2000 at gmail.com>
wrote:
> Dear R users,
>
> I'd like to count the number of integers in a vector y.
>
> Here is an example.
>
> y <- c(0,1,1,3,3,3,5,5,6)
>
> In fact, I know how to count the number of specific number in y.
>
> sum(y==0) -> 1
> sum(y==1) -> 2
> sum(y==2) -> 0
> sum(y==3) -> 3
> sum(y==4) -> 0
> sum(y==5) -> 2
> sum(y==6) -> 1
>
>
> However, in one computation I want to get this vector [1,2,0,3,0,2,1].
>
> Thank you in advance.
>
> Kathie
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Counting-the-number-of-integers-at-one-swoop-tp3901215p3901215.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>

try this:
> y <- c(0,1,1,3,3,3,5,5,6)
> x <- tabulate(y+1)
> names(x) <- seq(from = 0, by = 1, length = length(x))
> x
0 1 2 3 4 5 6
1 2 0 3 0 2 1
>

On Thu, Oct 13, 2011 at 7:33 AM, Kathie <kathryn.lord2000 at gmail.com>
wrote:
> Dear R users,
>
> I'd like to count the number of integers in a vector y.
>
> Here is an example.
>
> y <- c(0,1,1,3,3,3,5,5,6)
>
> In fact, I know how to count the number of specific number in y.
>
> sum(y==0) -> 1
> sum(y==1) -> 2
> sum(y==2) -> 0
> sum(y==3) -> 3
> sum(y==4) -> 0
> sum(y==5) -> 2
> sum(y==6) -> 1
>
>
> However, in one computation I want to get this vector [1,2,0,3,0,2,1].
>
> Thank you in advance.
>
> Kathie
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Counting-the-number-of-integers-at-one-swoop-tp3901215p3901215.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>


-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?

Kathie wrote on 10/13/2011 06:33:59 AM:
> 
> Dear R users,
> 
> I'd like to count the number of integers in a vector y.
> 
> Here is an example.
> 
> y <- c(0,1,1,3,3,3,5,5,6)
> 
> In fact, I know how to count the number of specific number in y.
> 
> sum(y==0) -> 1
> sum(y==1) -> 2
> sum(y==2) -> 0
> sum(y==3) -> 3
> sum(y==4) -> 0
> sum(y==5) -> 2
> sum(y==6) -> 1
> 
> 
> However, in one computation I want to get this vector [1,2,0,3,0,2,1]. 
> 
> Thank you in advance.
> 
> Kathie

tabulate(factor(as.integer(y), levels=0L:6L))

Jean
	[[alternative HTML version deleted]]

You guys are working too hard.


Rgames> y <- c(0,1,1,3,3,3,5,5,6)
Rgames> rle(sort(y))
Run Length Encoding
   lengths: int [1:5] 1 2 3 2 1
   values : num [1:5] 0 1 3 5 6


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