[R] Combine vectors in order to form matrixes with combn

[Moreno Mancosu]

> Moreno,
>
> I don't understand exactly what it is you are trying to 
do.  Can you explain what you want your matrices to look like?  Perhaps 
give an example.
>
> Bryan


Dear Bryan,

let's try with an example: i 
have 8 column vectors

v1<-matrix(c(2,5,6,8))
v2<-matrix(c(3,7,9,11))

v3<-matrix(c(13,4,2,7))
v4<-matrix(c(3.4,6,11,21))
v5<-matrix(c
(1,9,45,3))
v6<-matrix(c(2,76,4,2))
v7<-matrix(c(34,7,8,1))
v8<-matrix(c
(2,6,1,9))

I would like to form a combination of theese vectors in 
order to obtain a set of matrixes in the form
"k-combinations from a 
set" of n elements, when the set is the number of vectors (in this case 
8) 
and k is the number of columns (in this case 4):

in this example, 
i would like to obtain

        
matrix_1

     [,1] [,2] [,3] [,4]

[1,]    2    3   13  3.4
[2,]    5    7    4  6.0
[3,]    6    9    2 
11.0
[4,]    8   11    7 21.0

matrix_2

     [,1] [,2] [,3] [,4]

[1,]    2    3   13    1
[2,]    5    7    4    9
[3,]    6    9    2   
45
[4,]    8   11    7    3

matrix_3

     [,1] [,2] [,3] [,4]
[1,]    
2    3   13    2
[2,]    5    7    4   76
[3,]    6    9    2    4

[4,]    8   11    7    2

[...]

matrix_n!/k!(n-k!)

     [,1] [,2] [,
3] [,4]
[1,]    1    2   34    2
[2,]    9   76    7    6
[3,]   45    
4    8    1
[4,]    3    2    1    9

I hope I was more clear!


However, thanks in advance,

Moreno


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