Purpose
=======
DLARFG generates a real elementary reflector H of order n, such
that
H * ( alpha ) = ( beta ), H' * H = I.
( x ) ( 0 )
where alpha and beta are scalars, and x is an (n-1)-element real
vector. H is represented in the form
H = I - tau * ( 1 ) * ( 1 v' ) ,
( v )
where tau is a real scalar and v is a real (n-1)-element
vector.
If the elements of x are all zero, then tau = 0 and H is taken to be
the unit matrix.
Otherwise 1 .LE. tau .LE. 2.
Namespace: DotNumerics.LinearAlgebra.CSLapackAssembly: DWSIM.MathOps.DotNumerics (in DWSIM.MathOps.DotNumerics.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax public void Run(
int N,
ref double ALPHA,
ref double[] X,
int offset_x,
int INCX,
ref double TAU
)
Public Sub Run (
N As Integer,
ByRef ALPHA As Double,
ByRef X As Double(),
offset_x As Integer,
INCX As Integer,
ByRef TAU As Double
)
Request Example
View SourceParameters
- N Int32
-
(input) INTEGER
The order of the elementary reflector.
- ALPHA Double
-
(input/output) DOUBLE PRECISION
On entry, the value alpha.
On exit, it is overwritten with the value beta.
- X Double
-
(input/output) DOUBLE PRECISION array, dimension
(1+(N-2)*abs(INCX))
On entry, the vector x.
On exit, it is overwritten with the vector v.
- offset_x Int32
-
- INCX Int32
-
(input) INTEGER
The increment between elements of X. INCX .GT. 0.
- TAU Double
-
(output) DOUBLE PRECISION
The value tau.
See Also