Purpose
=======
DGELQ2 computes an LQ factorization of a real m by n matrix A:
A = L * Q.
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 M,
int N,
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 (
M As Integer,
N 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
)
Request Example
View SourceParameters
- M Int32
-
(input) INTEGER
The number of rows of the matrix A. M .GE. 0.
- N Int32
-
(input) INTEGER
The number of columns of the matrix A. N .GE. 0.
- A Double
-
(input/output) DOUBLE PRECISION array, dimension (LDA,N)
On entry, the m by n matrix A.
On exit, the elements on and below the diagonal of the array
contain the m by min(m,n) lower trapezoidal matrix L (L is
lower triangular if m .LE. n); the elements above the diagonal,
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,M).
- TAU Double
-
(output) DOUBLE PRECISION array, dimension (min(M,N))
The scalar factors of the elementary reflectors (see Further
Details).
- offset_tau Int32
-
- WORK Double
-
(workspace) DOUBLE PRECISION array, dimension (M)
- 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