https://github.com/cran/Matrix
Tip revision: 19f0062d379d9a43a18a1dc7ddacd12c535fc08d authored by Douglas Bates on 04 July 2005, 00:00:00 UTC
version 0.97-1
version 0.97-1
Tip revision: 19f0062
dsCMatrix.R
#### Symmetric Sparse Matrices in compressed column-oriented format
### contains = "dgCMatrix"
setAs("dsCMatrix", "dgTMatrix",
function(from) .Call("dsCMatrix_to_dgTMatrix", from))
setAs("dsCMatrix", "dgeMatrix",
function(from) as(as(from, "dgTMatrix"), "dgeMatrix"))
setAs("dsCMatrix", "matrix",
function(from) as(as(from, "dgTMatrix"), "matrix"))
setAs("dsCMatrix", "lsCMatrix",
function(from) new("lsCMatrix", i = from@i, p = from@p, uplo = from@uplo,
Dim = from@Dim, Dimnames = from@Dimnames))
if(FALSE) { ## << FIXME
setAs("dsCMatrix", "dsTMatrix",
function(from) { }) ## < follow "csc_to_dgTMatrix" in ../src/dgTMatrix.c
setAs("dsCMatrix", "dsyMatrix",
function(from) as(as(from, "dsTMatrix"), "dsyMatrix"))
}# not yet
setMethod("solve", signature(a = "dsCMatrix", b = "dgeMatrix"),
function(a, b, ...)
.Call("dsCMatrix_matrix_solve", a, b, TRUE),
valueClass = "dgeMatrix")
setMethod("solve", signature(a = "dsCMatrix", b = "matrix"),
function(a, b, ...)
.Call("dsCMatrix_matrix_solve", a, b, FALSE),
valueClass = "dgeMatrix")
##setMethod("solve", signature(a = "dsCMatrix", b = "numeric"),
## function(a, b, ...) callGeneric(a, as.matrix(b)),
## valueClass = "dgeMatrix")
setMethod("chol", signature(x = "dsCMatrix", pivot = "missing"),
function(x, pivot, LINPACK) .Call("dsCMatrix_chol", x, TRUE))
setMethod("chol", signature(x = "dsCMatrix", pivot = "logical"),
function(x, pivot, LINPACK) .Call("dsCMatrix_chol", x, pivot))
setMethod("t", signature(x = "dsCMatrix"),
function(x) .Call("ssc_transpose", x),
valueClass = "dsCMatrix")
setMethod("determinant", signature(x = "dsCMatrix", logarithm = "missing"),
function(x, logarithm, ...) determinant(x, TRUE))
setMethod("determinant", signature(x = "dsCMatrix", logarithm = "logical"),
function(x, logarithm, ...)
{
ldet <- sum(log(chol(x)@D))
modulus <- if (logarithm) ldet else exp(ldet)
attr(modulus, "logarithm") <- logarithm
val <- list(modulus = modulus, sign = as.integer(1))
class(val) <- "det"
val
})