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ZLANV2(l)                              )                             ZLANV2(l)

NAME

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

SYNOPSIS

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

PURPOSE

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 ]

ARGUMENTS

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.

FURTHER DETAILS

Implemented by Mark R. Fahey, May 28, 1999 ScaLAPACK version 1.7 13 August 2001 ZLANV2(l)

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