[R] transformation matrice of vector into array
Jessica Gervais
jessica.gervais at tudor.lu
Thu Jul 27 16:00:42 CEST 2006
Hi,
I need some help
I have a matrix M(m,n) in which each element is a vector V of lenght 6
1 2 3 4 5 6 7
1 List,6 List,6 List,6 List,6 List,6 List,6 List,6
2 List,6 List,6 List,6 List,6 List,6 List,6 List,6
3 List,6 List,6 List,6 List,6 List,6 List,6 List,6
4 List,6 List,6 List,6 List,6 List,6 List,6 List,6
i would like to make the sum on the matrix of each element of the
matrix, that is to say
sum(on the matrix)(M[j,][[j]][[1]])
sum(on the matrix)(M[j,][[j]][[2]])
...
sum(on the matrix)(M[j,][[j]][[6]])
I don't really know how to do.
I thought it was possible to transform the matrix M into an array A of
dimension (m,n,6), and then use the command sum(colsums(A[,,1]), which
seems to be possible and quite fast.
...but I don't know how to convert a matrix of vector into an array....
As anyone any little idea about that ?
Thanks by advance
Jessica
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