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DLARFGRun Method

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.CSLapack
Assembly: 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
)
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Parameters

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