DGEHD2Run Method

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

Parameters

N  Int32

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

ILO  Int32

(input) INTEGER

IHI  Int32

(input) INTEGER It is assumed that A is already upper triangular in rows and columns 1:ILO-1 and IHI+1:N. ILO and IHI are normally set by a previous call to DGEBAL; otherwise they should be set to 1 and N respectively. See Further Details. 1 .LE. ILO .LE. IHI .LE. max(1,N).

A  Double

(input/output) DOUBLE PRECISION array, dimension (LDA,N) On entry, the n by n general matrix to be reduced. On exit, the upper triangle and the first subdiagonal of A are overwritten with the upper Hessenberg matrix H, and the elements below the first subdiagonal, with the array TAU, represent the orthogonal matrix Q as a product of elementary reflectors. See Further Details.

offset_a  Int32

 

LDA  Int32

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

TAU  Double

(output) DOUBLE PRECISION array, dimension (N-1) The scalar factors of the elementary reflectors (see Further Details).

offset_tau  Int32

 

WORK  Double

(workspace) DOUBLE PRECISION array, dimension (N)

offset_work  Int32

 

INFO  Int32

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

Reference