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Man Pages


Manual Reference Pages  -  ZLANV2 (l)

NAME

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

CONTENTS

Synopsis
Purpose
Arguments
Further Details

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

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ScaLAPACK version 1.7 ZLANV2 (l) 13 August 2001

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