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

[Bryan Keller]

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 è prodotto un NA per coercizione
> 
> 
> Some ideas?
> 
> Thanks 
> in advance,
> 
> Moreno
> 
> 
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