DragonFly On-Line Manual Pages

CLANV2(l)                              )                             CLANV2(l)

NAME
       CLANV2 - compute the Schur factorization of a complex 2-by-2
       nonhermitian matrix in standard form

SYNOPSIS
       SUBROUTINE CLANV2( A, B, C, D, RT1, RT2, CS, SN )
           REAL CS
           COMPLEX A, B, C, D, RT1, RT2, SN

PURPOSE
       CLANV2 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
               B       (input/output) COMPLEX C       (input/output) COMPLEX D
               (input/output) COMPLEX On entry, the elements of the input
               matrix.  On exit, they are overwritten by the elements of the
               standardised Schur form.

       RT1     (output) COMPLEX
               RT2     (output) COMPLEX The two eigenvalues.

       CS      (output) REAL
               SN      (output) COMPLEX Parameters of the rotation matrix.

FURTHER DETAILS
       Implemented by Mark R. Fahey, May 28, 1999

ScaLAPACK version 1.7           13 August 2001                       CLANV2(l)