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DORM2LRun Method

Purpose ======= DORM2L overwrites the general real m by n matrix C with Q * C if SIDE = 'L' and TRANS = 'N', or Q'* C if SIDE = 'L' and TRANS = 'T', or C * Q if SIDE = 'R' and TRANS = 'N', or C * Q' if SIDE = 'R' and TRANS = 'T', where Q is a real orthogonal matrix defined as the product of k elementary reflectors Q = H(k) . . . H(2) H(1) as returned by DGEQLF. Q is of order m if SIDE = 'L' and of order n if SIDE = 'R'.

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,
	string TRANS,
	int M,
	int N,
	int K,
	ref double[] A,
	int offset_a,
	int LDA,
	double[] TAU,
	int offset_tau,
	ref double[] C,
	int offset_c,
	int LDC,
	ref double[] WORK,
	int offset_work,
	ref int INFO
)
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Parameters

SIDE  String
(input) CHARACTER*1 = 'L': apply Q or Q' from the Left = 'R': apply Q or Q' from the Right
TRANS  String
(input) CHARACTER*1 = 'N': apply Q (No transpose) = 'T': apply Q' (Transpose)
M  Int32
(input) INTEGER The number of rows of the matrix C. M .GE. 0.
N  Int32
(input) INTEGER The number of columns of the matrix C. N .GE. 0.
K  Int32
(input) INTEGER The number of elementary reflectors whose product defines the matrix Q. If SIDE = 'L', M .GE. K .GE. 0; if SIDE = 'R', N .GE. K .GE. 0.
A  Double
(input) DOUBLE PRECISION array, dimension (LDA,K) The i-th column must contain the vector which defines the elementary reflector H(i), for i = 1,2,...,k, as returned by DGEQLF in the last k columns of its array argument A. A is modified by the routine but restored on exit.
offset_a  Int32
 
LDA  Int32
(input) INTEGER The leading dimension of the array A. If SIDE = 'L', LDA .GE. max(1,M); if SIDE = 'R', LDA .GE. max(1,N).
TAU  Double
(input) DOUBLE PRECISION array, dimension (K) TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by DGEQLF.
offset_tau  Int32
 
C  Double
* Q if SIDE = 'R' and TRANS = 'N', or
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', (M) if SIDE = 'R'
offset_work  Int32
 
INFO  Int32
(output) INTEGER = 0: successful exit .LT. 0: if INFO = -i, the i-th argument had an illegal value
See Also