These are objects of class
expand.lu.Matrix
They represent the LU decomposition of a matrix.
GENERATION:
This class of objects is returned from the
expand.lu.Matrix function
to represent an LU decomposition.
The following components must be included in a legitimate
"expand.lu.Matrix" object:
VALUE:
l
The unit lower triangular/trapezoidal factor.
u
The upper triangular/trapezoidal factor.
permutation
The row permutation applied to the original matrix in order to obtain the
factorization.