[R] output from table() in matrix form

[BXC (Bendix Carstensen)]

You probably want something like:

> t1 <- table( x )
> t1
x
 1  2 20 
 3  2  1 
> t2 <- rbind( as.numeric( names( t1 ) ), t1 )
> t2
   1 2 20
   1 2 20
t1 3 2  1
> dimnames( t2 ) <- NULL
> t2
     [,1] [,2] [,3]
[1,]    1    2   20
[2,]    3    2    1
> 

Bendix 
----------------------
Bendix Carstensen
Senior Statistician
Steno Diabetes Center
Niels Steensens Vej 2
DK-2820 Gentofte
Denmark
tel: +45 44 43 87 38
mob: +45 30 75 87 38
fax: +45 44 43 07 06
bxc at steno.dk
www.biostat.ku.dk/~bxc
----------------------


> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Robin Hankin
> Sent: Wednesday, January 05, 2005 1:18 PM
> To: R-help at stat.math.ethz.ch
> Subject: [R] output from table() in matrix form
> 
> 
> Hi
> 
> How do I get the output from table() in matrix form?
> 
> If I have
> 
> R>  table(c(1,1,1,1,2,20))
> 
>   1  2 20
>   4  1  1
> 
> I want
> 
>       [,1] [,2] [,3]
> [1,]    1    2   20
> [2,]    4    1    1
> 
> 
> The problem is that names(table) is a vector of characters and I need 
> the numeric values.
> 
> I am using
> 
> R>  rbind(as.integer(names(x)),x)
> 
> 
> 
> 
> I thought tabulate() might be better as it takes an integer-valued 
> vector, but it isn't
> quite right because the default bins are 1:20 and  I don't want the 
> zeroes.
> 
> The following is a little clunky:
> 
> R> x <- rbind(1:20,tabulate(c(1,1,1,1,2,20)))
> R> x[,x[2,]>0]
>       [,1] [,2] [,3]
> [1,]    1    2   20
> [2,]    4    1    1
> 
> 
> Is there a better way?   It seems inelegant to coerce a character 
> vector back to integers,
> but OTOH  it's wasteful to have 20 bins when I only need 3.  My real 
> application would have
> maybe a dozen distinct (prime) integers in the range 2 up to 
> about  1e4.
> 
> 
> 
> 
> 
> --
> Robin Hankin
> Uncertainty Analyst
> Southampton Oceanography Centre
> European Way, Southampton SO14 3ZH, UK
>   tel  023-8059-7743
> 
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