Click or drag to resize

DLARZRun Method

Purpose ======= DLARZ applies a real elementary reflector H to a real M-by-N matrix C, from either the left or the right. H is represented in the form H = I - tau * v * v' where tau is a real scalar and v is a real vector. If tau = 0, then H is taken to be the unit matrix.

Namespace: DotNumerics.LinearAlgebra.CSLapack
Assembly: DWSIM.MathOps.DotNumerics (in DWSIM.MathOps.DotNumerics.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax
Copy
public void Run(
	string SIDE,
	int M,
	int N,
	int L,
	double[] V,
	int offset_v,
	int INCV,
	double TAU,
	ref double[] C,
	int offset_c,
	int LDC,
	ref double[] WORK,
	int offset_work
)
Request Example View Source

Parameters

SIDE  String
(input) CHARACTER*1 = 'L': form H * C = 'R': form C * H
M  Int32
(input) INTEGER The number of rows of the matrix C.
N  Int32
(input) INTEGER The number of columns of the matrix C.
L  Int32
(input) INTEGER The number of entries of the vector V containing the meaningful part of the Householder vectors. If SIDE = 'L', M .GE. L .GE. 0, if SIDE = 'R', N .GE. L .GE. 0.
V  Double
(input) DOUBLE PRECISION array, dimension (1+(L-1)*abs(INCV)) The vector v in the representation of H as returned by DTZRZF. V is not used if TAU = 0.
offset_v  Int32
 
INCV  Int32
(input) INTEGER The increment between elements of v. INCV .LT..GT. 0.
TAU  Double
(input) DOUBLE PRECISION The value tau in the representation of H.
C  Double
(input/output) DOUBLE PRECISION array, dimension (LDC,N) On entry, the M-by-N matrix C. On exit, C is overwritten by the matrix H * C if SIDE = 'L', or C * H if SIDE = 'R'.
offset_c  Int32
 
LDC  Int32
(input) INTEGER The leading dimension of the array C. LDC .GE. max(1,M).
WORK  Double
(workspace) DOUBLE PRECISION array, dimension (N) if SIDE = 'L' or (M) if SIDE = 'R'
offset_work  Int32
 
See Also