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ZLANV2(l) ) ZLANV2(l)

ZLANV2 - compute the Schur factorization of a complex 2-by-2 nonhermitian matrix in standard form

SUBROUTINE ZLANV2(
A, B, C, D, RT1, RT2, CS, SN )
DOUBLE PRECISION CS COMPLEX*16 A, B, C, D, RT1, RT2, SN

ZLANV2 computes the Schur factorization of a complex 2-by-2 nonhermitian matrix in standard form:
[ A B ] = [ CS -SN ] [ AA BB ] [ CS SN ]
 

[ C D ] [ SN CS ] [ 0 DD ] [-SN CS ]
 

A (input/output) COMPLEX*16
B (input/output) COMPLEX*16 C (input/output) COMPLEX*16 D (input/output) COMPLEX*16 On entry, the elements of the input matrix. On exit, they are overwritten by the elements of the standardised Schur form.
RT1 (output) COMPLEX*16
RT2 (output) COMPLEX*16 The two eigenvalues.
CS (output) DOUBLE PRECISION
SN (output) COMPLEX*16 Parameters of the rotation matrix.

Implemented by Mark R. Fahey, May 28, 1999
 
13 August 2001 ScaLAPACK version 1.7

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