Matrix (version 1.2-8)

dtRMatrix-class: Triangular Sparse Compressed Row Matrices

Description

The dtRMatrix class is a class of triangular, sparse matrices in the compressed, row-oriented format. In this implementation the non-zero elements in the rows are sorted into increasing columnd order.

Objects from the Class

Objects can be created by calls of the form new("dtrMatrix", ...).

Slots

Extends

Class "ddenseMatrix", directly. Class "triangularMatrix", directly. Class "Matrix" and others, by class "ddenseMatrix".

Methods

Among others (such as matrix products, e.g. ?crossprod-methods),

efficientely use a “forwardsolve” or backsolve for a lower or upper triangular matrix, respectively, see also solve-methods.

Objects from the Class

This class is currently still mostly unimplemented! Objects can be created by calls of the form new("dtRMatrix", ...).

Slots

Extends

Class "dgRMatrix", directly. Class "dsparseMatrix", by class "dgRMatrix". Class "dMatrix", by class "dgRMatrix". Class "sparseMatrix", by class "dgRMatrix". Class "Matrix", by class "dgRMatrix".

Methods

No methods currently with class "dsRMatrix" in the signature.

See Also

Classes dgCMatrix, dgTMatrix, dgeMatrix

Examples

(m0 <- new("dtRMatrix"))
(m2 <- new("dtRMatrix", Dim = c(2L,2L),
                        x = c(5, 1:2), p = c(0L,2:3), j= c(0:1,1L)))
str(m2)
(m3 <- as(Diagonal(2), "RsparseMatrix"))# --> dtRMatrix

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