CHMfactor-class {Matrix} | R Documentation |
The hidden class "CHMfactor"
is a class of
CHOLMOD-based Cholesky factorizations of symmetric, sparse,
compressed, column-oriented matrices. Such a factorization is
simplicial (hidden class "CHMsimpl"
) or supernodal (hidden
class "CHMsuper"
). Objects that inherit from these classes are either numeric
factorizations (classes "dCHMsimpl"
and "dCHMsuper"
) or
symbolic factorizations (classes "dCHMsimpl"
and "dCHMsuper"
).
Objects can be created by calls of the form new("dCHMsuper", ...)
but are more commonly created from chol
applied to
dsCMatrix
or lsCMatrix
objects.
perm
:"integer"
giving the
permutation of the rows and columns chosen to reduce fill-in and
for post-ordering.p
:"integer"
of pointers, one
for each column, to the initial (zero-based) index of elements in
the column. Only present in classes that contain "CHMsimpl"
.i
:"integer"
of length nnzero
(number of non-zero elements). These are the row numbers for
each non-zero element in the matrix. Only present in classes that
contain "CHMsimpl"
.x
:"numeric"
- the non-zero
elements of the matrix.
Class dgCMatrix