R help - Sep 2009 - Combine vectors in order to form matrixes with combn

Hello!

I've a problem with the combn function and a set of vector. I 
would like to make a simple combination where, instead of scalars, i 
would like to combine vector, in order to form matrixes.
In other 
words, i have nineteen 6-items vectors (for example coef1-coef19), that 
i would like to combine in n!/k!(n-k)! 6x6 matrixes.

I tried with a 
code like this

mma <- combn(c(coeff1,coeff2,...,coeff19),function(x)
matrix(x,6,6))

but i think that R doesn't recognize that these are not 
scalars. In fact the error is:

Errore in matrix(r, nrow = len.r, ncol 
= count) :
  invalid 'ncol' value (too large or NA)
Inoltre: Warning 
message:
In combn(c(coeff1, coeff2, coeff3, coeff4, coeff5, coeff6, 
coeff7,  :
  si ? prodotto un NA per coercizione


Some ideas?

Thanks 
in advance,

Moreno


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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

-------------
Bryan Keller, Doctoral Student/Project Assistant
Educational Psychology - Quantitative Methods
The University of Wisconsin - Madison

----- Original Message -----
From: Moreno Mancosu <nomero at tiscali.it>
Date: Monday, September 21, 2009 9:21 am
Subject: [R] Combine vectors in order to form matrixes with combn
To: r-help at r-project.org
> Hello!
> 
> I've a problem with the combn function and a set of vector. I 
> would like to make a simple combination where, instead of scalars, i 
> would like to combine vector, in order to form matrixes.
> In other 
> words, i have nineteen 6-items vectors (for example coef1-coef19), 
> that 
> i would like to combine in n!/k!(n-k)! 6x6 matrixes.
> 
> I tried with a 
> code like this
> 
> mma <- combn(c(coeff1,coeff2,...,coeff19),function(x)
> matrix(x,6,6))
> 
> but i think that R doesn't recognize that these are not 
> scalars. In fact the error is:
> 
> Errore in matrix(r, nrow = len.r, ncol 
> = count) :
>   invalid 'ncol' value (too large or NA)
> Inoltre: Warning 
> message:
> In combn(c(coeff1, coeff2, coeff3, coeff4, coeff5, coeff6, 
> coeff7,  :
>   si ? prodotto un NA per coercizione
> 
> 
> Some ideas?
> 
> Thanks 
> in advance,
> 
> Moreno
> 
> 
> Tutto Incluso Light: chiami e navighi senza limiti a soli 9,95 euro al 
> mese. Gratis la Sim Tiscali Mobile con 25 euro di traffico! ATTIVA ORA
> 
> http://abbonati.tiscali.it/telefono-adsl/prodotti/tc/tuttoincluso_light/
> 
> ______________________________________________
> 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.

> 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


Tutto Incluso Light: chiami e navighi senza limiti a soli 9,95 euro al mese.
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