factor:

Syntax:	factor ( A )

Description:

	The factor function computes the LU factorization of the input
	matrix A. Factor returns a list with 3 elements: 

	lu	a matrix containing the LU factors
	pvt	a vector containing the pivot indices
	rcond	the inverse of the condition estimate

	Factor utilizes the LAPACK subroutines DGETRF, DGECON or
	ZGETRF, ZGECON.

	Factor returns the results in the above format, so that they
	may be conveniently used with backsub for repetitive
	solutions. The user-function lu will separate the results from
	factor into separate L and U matrices.

See Also: backsub, inv, solve
