### Name: CHMfactor-class
### Title: CHOLMOD-based Cholesky Factorizations
### Aliases: CHMfactor-class CHMsimpl-class CHMsuper-class dCHMsimpl-class
###   nCHMsimpl-class dCHMsuper-class nCHMsuper-class
###   coerce,CHMfactor,Matrix-method coerce,CHMfactor,sparseMatrix-method
###   coerce,CHMfactor,pMatrix-method expand,CHMfactor-method
###   solve,CHMfactor,ddenseMatrix-method
###   solve,CHMfactor,dsparseMatrix-method solve,CHMfactor,numeric-method
###   solve,CHMfactor,matrix-method solve,CHMfactor,ANY-method
###   determinant,CHMfactor,missing-method
###   determinant,CHMfactor,logical-method update,CHMfactor-method
### Keywords: classes algebra

### ** Examples

## An example for the expand() method
n <- 1000; m <- 200; nnz <- 2000
set.seed(1)
M1 <- spMatrix(n, m,
               i = sample(n, nnz, replace = TRUE),
               j = sample(m, nnz, replace = TRUE),
               x = round(rnorm(nnz),1))
XX <- crossprod(M1)
CX <- Cholesky(XX)
str(CX) ## a "dCHMsimpl" object
r <- expand(CX <- Cholesky(XX))
L.P <- with(r, crossprod(L,P))  ## == L'P
PLLP <- crossprod(L.P)          ## == (L'P)' L'P == P'LL'P
stopifnot( all.equal(PLLP, XX) )