setMethod("expand", signature(x = "denseLU"),
function(x, ...) .Call(LU_expand, x))
setMethod("solve", signature(a = "denseLU", b = "missing"),
function(a, b, ...) {
ll <- expand(a) #-> list(L, U, P); orig x = P %*% L %*% U
## too expensive: with(lapply(ll, solve), U %*% L %*% P)
solve(ll$U, solve(ll$L, ll$P))
})
setMethod("expand", signature(x = "sparseLU"),
function(x, ...)
list(P = as(x@p + 1L, "pMatrix"),
L = x@L,
U = x@U,
Q = as(x@q + 1L, "pMatrix")))
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