Matrix (version 0.999375-2)

ddiMatrix-class: Class "ddiMatrix" of Diagonal Numeric Matrices

Description

The class "ddiMatrix" of numerical diagonal matrices. Note that diagonal matrices extend dense, not sparse matrices.

Objects from the Class

Objects can be created by calls of the form new("ddiMatrix", ...) but typically rather via Diagonal.

Extends

Class "diagonalMatrix", directly. Class "ddenseMatrix", directly. Classes "denseMatrix" and "dMatrix" and their super classes, indirectly, see showClass("ddiMatrix").

See Also

Class diagonalMatrix and function Diagonal.

Examples

(d2 <- Diagonal(x = c(10,1)))
str(d2)
## slightly larger in internal size:
str(as(d2, "sparseMatrix"))

M <- Matrix(cbind(1,2:4))
M %*% d2 #> `fast' multiplication

chol(d2) # trivial