sparseLU-class {Matrix} | R Documentation |
Objects of this class contain the components of the LU decomposition of a sparse square matrix.
Objects can be created by calls of the form new("sparseLU",
...)
but are more commonly created by function lu
applied to a sparse matrix, such as a matrix of class
dgCMatrix
.
L
:"dgCMatrix"
The lower
triangular factor from the left.U
:"dgCMatrix"
The upper
triangular factor from the right.p
:"integer"
Permutation
applied from the left. q
:"integer"
Permutation
applied from the right.Dim
:MatrixFactorization
.
Class "LU"
, directly.
Class "MatrixFactorization"
, by class "LU"
.
No methods defined with class "sparseLU" in the signature.
The decomposition is of the form
A = PLUQ
where all matrices are sparse and of size n by n. The matrices P and Q are permutation matrices, L is lower triangular and U is upper triangular.