Aliases: expand expand,CHMfactor-method expand,MatrixFactorization-method expand,denseLU-method expand,sparseLU-method
Keywords: algebra
### ** Examples (x <- Matrix(round(rnorm(9),2), 3, 3))
3 x 3 Matrix of class "dgeMatrix"
[,1] [,2] [,3]
[1,] -0.21 2.14 0.58
[2,] -0.79 -3.04 -2.12
[3,] -0.33 -0.13 0.34
(ex <- expand(lux <- lu(x)))
$L
3 x 3 Matrix of class "dtrMatrix" (unitriangular)
[,1] [,2] [,3]
[1,] 1.0000000 . .
[2,] 0.2658228 1.0000000 .
[3,] 0.4177215 0.3866466 1.0000000
$U
3 x 3 Matrix of class "dtrMatrix"
[,1] [,2] [,3]
[1,] -0.7900000 -3.0400000 -2.1200000
[2,] . 2.9481013 1.1435443
[3,] . . 0.7834221
$P
3 x 3 sparse Matrix of class "pMatrix"
[1,] . | .
[2,] | . .
[3,] . . |