[R] Creating sparse matrix of type "dgCMatrix" directly

[Søren Højsgaard]

I want to create a sparse matrix of type "dgCMatrix" using the Matrix package (and the matrix must be of this type even if other more compact representations may exist). I do

> library(Matrix)
> m1<-Matrix(rep(1,4),nrow=2,ncol=2,sparse=T)
> m1
2 x 2 sparse Matrix of class "dsCMatrix"
        
[1,] 1 1
[2,] 1 1

To convert m1, I do
> as(m1, "dgCMatrix")
2 x 2 sparse Matrix of class "dgCMatrix"
        
[1,] 1 1
[2,] 1 1

Is it possible to construct a dgCMatrix "directly" i.e. without going through the additional as() step above?

Best regards
Søren