Hi all.
I am currently attempting to build a list of sparse matrixes. That I have
already achieved, by
> vmat <- list()
> for (i in 1:n) {
> vmat <- c(vmat, sparseMatrix(i,j,x=data)
> }
How I am trying to select those elements from the list where the column e.g.
999 is not null. I can do this for one of the sparse matrices with
> which(vmat[[1]][,999] != 0)
which returns the rows where such column is non-zero.
However, my purpose is to obtain the list indices of the sparse matrices
with such non-zero elements. I tried things like
which(vmat[[]][,999] != 0)
which(vmat[,,999] != 0)
sapply(vmat, which, [,999] != 0)
but none worked... any help will be appreciated!!
Cheers,
Germán
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