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DLAEV2Run Method

Purpose ======= DLAEV2 computes the eigendecomposition of a 2-by-2 symmetric matrix [ A B ] [ B C ]. On return, RT1 is the eigenvalue of larger absolute value, RT2 is the eigenvalue of smaller absolute value, and (CS1,SN1) is the unit right eigenvector for RT1, giving the decomposition [ CS1 SN1 ] [ A B ] [ CS1 -SN1 ] = [ RT1 0 ] [-SN1 CS1 ] [ B C ] [ SN1 CS1 ] [ 0 RT2 ].

Namespace: DotNumerics.LinearAlgebra.CSLapack
Assembly: DWSIM.MathOps.DotNumerics (in DWSIM.MathOps.DotNumerics.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax
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public void Run(
	double A,
	double B,
	double C,
	ref double RT1,
	ref double RT2,
	ref double CS1,
	ref double SN1
)
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Parameters

A  Double
(input) DOUBLE PRECISION The (1,1) element of the 2-by-2 matrix.
B  Double
(input) DOUBLE PRECISION The (1,2) element and the conjugate of the (2,1) element of the 2-by-2 matrix.
C  Double
(input) DOUBLE PRECISION The (2,2) element of the 2-by-2 matrix.
RT1  Double
(output) DOUBLE PRECISION The eigenvalue of larger absolute value.
RT2  Double
(output) DOUBLE PRECISION The eigenvalue of smaller absolute value.
CS1  Double
(output) DOUBLE PRECISION
SN1  Double
(output) DOUBLE PRECISION The vector (CS1, SN1) is a unit right eigenvector for RT1.
See Also