> A <- as.matrix.csr(0,5,4)
> A
An object of class "matrix.csr"
Slot "ra":
[1] 0
Slot "ja":
[1] 1
Slot "ia":
[1] 1 2 2 2 2 2
Slot "dimension":
[1] 5 4
> A[3,4] <- 3
> A
An object of class "matrix.csr"
Slot "ra":
[1] 0 3
Slot "ja":
[1] 1 4
Slot "ia":
[1] 1 2 2 3 3 3
Slot "dimension":
[1] 5 4
> as.matrix(A)
[,1] [,2] [,3] [,4]
[1,] 0 0 0 0
[2,] 0 0 0 0
[3,] 0 0 0 3
[4,] 0 0 0 0
[5,] 0 0 0 0
url: www.econ.uiuc.edu/~roger Roger Koenker
email [EMAIL PROTECTED] Department of Economics
vox: 217-333-4558 University of Illinois
fax: 217-244-6678 Champaign, IL 61820
On Jun 18, 2004, at 9:20 AM, Wolski wrote:
Hi!
Would like to initialize a huge matrix.csc (Pacakge SparseM) with all
elements 0
and afterwards set a few alements nonzero.
The matrix which I like to allocate is so huge that I can not use
A <- matrix(a,n1,p)
before:
A.csr <- as.matrix.csc(A)
because I can not allocate such a huge matrix A.
But I believe that the much more memmory efficient model in case of
csc matrix should do it for a sparse matrix.
How to do this.
Sincerely Eryk
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