DORGHRRun Method

public void Run(
	int N,
	int ILO,
	int IHI,
	ref double[] A,
	int offset_a,
	int LDA,
	double[] TAU,
	int offset_tau,
	ref double[] WORK,
	int offset_work,
	int LWORK,
	ref int INFO
)

Public Sub Run ( 
	N As Integer,
	ILO As Integer,
	IHI As Integer,
	ByRef A As Double(),
	offset_a As Integer,
	LDA As Integer,
	TAU As Double(),
	offset_tau As Integer,
	ByRef WORK As Double(),
	offset_work As Integer,
	LWORK As Integer,
	ByRef INFO As Integer
)

Parameters

N  Int32

(input) INTEGER The order of the matrix Q. N .GE. 0.

ILO  Int32

(input) INTEGER

IHI  Int32

(input) INTEGER ILO and IHI must have the same values as in the previous call of DGEHRD. Q is equal to the unit matrix except in the submatrix Q(ilo+1:ihi,ilo+1:ihi). 1 .LE. ILO .LE. IHI .LE. N, if N .GT. 0; ILO=1 and IHI=0, if N=0.

A  Double

(input/output) DOUBLE PRECISION array, dimension (LDA,N) On entry, the vectors which define the elementary reflectors, as returned by DGEHRD. On exit, the N-by-N orthogonal matrix Q.

offset_a  Int32

 

LDA  Int32

(input) INTEGER The leading dimension of the array A. LDA .GE. max(1,N).

TAU  Double

(input) DOUBLE PRECISION array, dimension (N-1) TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by DGEHRD.

offset_tau  Int32

 

WORK  Double

(workspace/output) DOUBLE PRECISION array, dimension (MAX(1,LWORK)) On exit, if INFO = 0, WORK(1) returns the optimal LWORK.

offset_work  Int32

 

LWORK  Int32

(input) INTEGER The dimension of the array WORK. LWORK .GE. IHI-ILO. For optimum performance LWORK .GE. (IHI-ILO)*NB, where NB is the optimal blocksize. If LWORK = -1, then a workspace query is assumed; the routine only calculates the optimal size of the WORK array, returns this value as the first entry of the WORK array, and no error message related to LWORK is issued by XERBLA.

INFO  Int32

(output) INTEGER = 0: successful exit .LT. 0: if INFO = -i, the i-th argument had an illegal value

Reference