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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