Nothing
blsplit <- function(x, cluster, fun, args, sort=FALSE) {
mstyle <- .get.mstyle("crayon" %in% .packages())
if (missing(cluster))
stop(mstyle$stop("Must specify 'cluster' variable."))
if (!is.matrix(x) && !inherits(x, "dgCMatrix"))
stop(mstyle$stop("Argument 'x' must be a matrix."))
if (!isSymmetric(x))
stop(mstyle$stop("Argument 'x' must be a symmetric matrix."))
k <- nrow(x)
if (length(cluster) != k)
stop(mstyle$stop(paste0("Length of variable specified via 'cluster' (", length(cluster), ") does not correspond to the dimensions of the matrix (", k, "x", k, ").")))
res <- list()
clusters <- unique(cluster)
if (sort)
clusters <- sort(clusters)
for (i in seq_along(clusters)) {
res[[i]] <- x[cluster == clusters[i], cluster == clusters[i], drop=FALSE]
}
names(res) <- clusters
if (!missing(fun)) {
if (missing(args)) {
res <- lapply(res, fun)
} else {
args <- as.list(args)
for (i in 1:length(res)) {
res[[i]] <- do.call(fun, c(unname(res[i]), args))
}
}
}
return(res)
}
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