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DLASY2Run Method

Purpose ======= DLASY2 solves for the N1 by N2 matrix X, 1 .LE. N1,N2 .LE. 2, in op(TL)*X + ISGN*X*op(TR) = SCALE*B, where TL is N1 by N1, TR is N2 by N2, B is N1 by N2, and ISGN = 1 or -1. op(T) = T or T', where T' denotes the transpose of T.

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(
	bool LTRANL,
	bool LTRANR,
	int ISGN,
	int N1,
	int N2,
	double[] TL,
	int offset_tl,
	int LDTL,
	double[] TR,
	int offset_tr,
	int LDTR,
	double[] B,
	int offset_b,
	int LDB,
	ref double SCALE,
	ref double[] X,
	int offset_x,
	int LDX,
	ref double XNORM,
	ref int INFO
)
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Parameters

LTRANL  Boolean
(input) LOGICAL On entry, LTRANL specifies the op(TL): = .FALSE., op(TL) = TL, = .TRUE., op(TL) = TL'.
LTRANR  Boolean
(input) LOGICAL On entry, LTRANR specifies the op(TR): = .FALSE., op(TR) = TR, = .TRUE., op(TR) = TR'.
ISGN  Int32
(input) INTEGER On entry, ISGN specifies the sign of the equation as described before. ISGN may only be 1 or -1.
N1  Int32
(input) INTEGER On entry, N1 specifies the order of matrix TL. N1 may only be 0, 1 or 2.
N2  Int32
(input) INTEGER On entry, N2 specifies the order of matrix TR. N2 may only be 0, 1 or 2.
TL  Double
(input) DOUBLE PRECISION array, dimension (LDTL,2) On entry, TL contains an N1 by N1 matrix.
offset_tl  Int32
 
LDTL  Int32
(input) INTEGER The leading dimension of the matrix TL. LDTL .GE. max(1,N1).
TR  Double
(input) DOUBLE PRECISION array, dimension (LDTR,2) On entry, TR contains an N2 by N2 matrix.
offset_tr  Int32
 
LDTR  Int32
(input) INTEGER The leading dimension of the matrix TR. LDTR .GE. max(1,N2).
B  Double
(input) DOUBLE PRECISION array, dimension (LDB,2) On entry, the N1 by N2 matrix B contains the right-hand side of the equation.
offset_b  Int32
 
LDB  Int32
(input) INTEGER The leading dimension of the matrix B. LDB .GE. max(1,N1).
SCALE  Double
(output) DOUBLE PRECISION On exit, SCALE contains the scale factor. SCALE is chosen less than or equal to 1 to prevent the solution overflowing.
X  Double
(output) DOUBLE PRECISION array, dimension (LDX,2) On exit, X contains the N1 by N2 solution.
offset_x  Int32
 
LDX  Int32
(input) INTEGER The leading dimension of the matrix X. LDX .GE. max(1,N1).
XNORM  Double
(output) DOUBLE PRECISION On exit, XNORM is the infinity-norm of the solution.
INFO  Int32
(output) INTEGER On exit, INFO is set to 0: successful exit. 1: TL and TR have too close eigenvalues, so TL or TR is perturbed to get a nonsingular equation. NOTE: In the interests of speed, this routine does not check the inputs for errors.
See Also