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#
# Export a bds matrix in "list mode".
# This has one row for each non-zero element
# Input: a bdsmatrix
# Output: a data frame containing "row", "col", "value" as variables
#
# Options:
# id: True: row/col contain the subject id (dimnames of the matrix)
# False:row/col contain integers
# diag: True -- the output contains the diagonal of the matrix
# False-- the output does not contain the diagonal
#
listbdsmatrix <- function(x, id=TRUE, diag=FALSE) {
if (!inherits(x, 'bdsmatrix')) stop("Invalid argument")
nblock <- length(x@blocksize)
bsize <- length(x@blocks)
indx <- .C("bdsmatrix_index2",
as.integer(nblock),
as.integer(x@blocksize),
rows= integer(bsize),
cols= integer(bsize))
# toss any zeros, and optionally the diagonal
if (diag) toss <- (x@blocks==0)
else toss <- (x@blocks==0 | indx$rows== indx$cols)
dd <- dimnames(x)[[1]]
if (id && !is.null(dd)) {
xr <- dd[indx$rows]
xc <- dd[indx$cols]
}
else {
xr <- indx$rows
xc <- indx$cols
}
if (any(toss))
data.frame(row=xr[!toss], col=xc[!toss], value=x@blocks[!toss])
else data.frame(row=xr, col=xc, value=x@blocks)
}
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