lu_factor Interface

public interface lu_factor

Module Procedures

private subroutine lu_factor_dbl(a, ipvt, err)

Computes the LU factorization of an M-by-N matrix.

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=real64),	intent(inout),		dimension(:,:)	::	a	On input, the M-by-N matrix on which to operate. On output, the LU factored matrix in the form [L\U] where the unit diagonal elements of L are not stored.
integer(kind=int32),	intent(out),		dimension(:)	::	ipvt	An MIN(M, N)-element array used to track row-pivot operations. The array stored pivot information such that row I is interchanged with row IPVT(I).
class(errors),	intent(inout),	optional,	target	::	err	An error object to report any errors that occur.

private subroutine lu_factor_cmplx(a, ipvt, err)

Computes the LU factorization of an M-by-N matrix.

Arguments

Type	Intent	Optional	Attributes		Name
complex(kind=real64),	intent(inout),		dimension(:,:)	::	a	On input, the M-by-N matrix on which to operate. On output, the LU factored matrix in the form [L\U] where the unit diagonal elements of L are not stored.
integer(kind=int32),	intent(out),		dimension(:)	::	ipvt	An MIN(M, N)-element array used to track row-pivot operations. The array stored pivot information such that row I is interchanged with row IPVT(I).
class(errors),	intent(inout),	optional,	target	::	err	An error object to report any errors that occur.

private subroutine csr_lu_factor(a, lu, ju, droptol, err)

Factors a matrix using an LU decomposition.

Arguments

Type	Intent	Optional	Attributes		Name
class(csr_matrix),	intent(in)			::	a	The matrix to factor.
type(msr_matrix),	intent(out)			::	lu	The LU matrix.
integer(kind=int32),	intent(out),		dimension(:)	::	ju	The row tracking array.
real(kind=real64),	intent(in),	optional		::	droptol	The drop tolerance for the ILUT factorization.
class(errors),	intent(inout),	optional,	target	::	err	The error object to be updated.