Matrix (version 0.99-3)

unpack: Full Storage Representation of Packed Matrices

Description

Expands decompositions stored in compact form into matrix factors.

Usage

unpack(x, ...)

Arguments

x

a matrix stored in packed form, e.g., of class "d?pMatrix" where "?" is "t" for triangular or "s" for symmetric.

...

further arguments passed to or from other methods.

Value

• A Matrix object containing the full-storage representation of x.

Details

This is a generic function with special methods for different types of packed matrices. Use showMethods("unpack") to list the methods for unpack().

Examples

showMethods("unpack")
(cp4 <- chol(Hilbert(4))) # is triangular
tp4 <- as(cp4,"dtpMatrix")# [t]riangular [p]acked
str(tp4)
(unpack(tp4))

## once we have Diagonal() :
unpack(Diagonal( 1:3))