DLANV2 man page on IRIX

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DLANV2(3F)							    DLANV2(3F)

NAME
     DLANV2 - compute the Schur factorization of a real 2-by-2 nonsymmetric
     matrix in standard form

SYNOPSIS
     SUBROUTINE DLANV2( A, B, C, D, RT1R, RT1I, RT2R, RT2I, CS, SN )

	 DOUBLE		PRECISION A, B, C, CS, D, RT1I, RT1R, RT2I, RT2R, SN

PURPOSE
     DLANV2 computes the Schur factorization of a real 2-by-2 nonsymmetric
     matrix in standard form:

	  [ A  B ] = [ CS -SN ] [ AA  BB ] [ CS	 SN ]
	  [ C  D ]   [ SN  CS ] [ CC  DD ] [-SN	 CS ]

     where either
     1) CC = 0 so that AA and DD are real eigenvalues of the matrix, or 2) AA
     = DD and BB*CC < 0, so that AA + or - sqrt(BB*CC) are complex conjugate
     eigenvalues.

ARGUMENTS
     A	     (input/output) DOUBLE PRECISION
	     B	     (input/output) DOUBLE PRECISION C	     (input/output)
	     DOUBLE PRECISION D	      (input/output) DOUBLE PRECISION On
	     entry, the elements of the input matrix.  On exit, they are
	     overwritten by the elements of the standardised Schur form.

     RT1R    (output) DOUBLE PRECISION
	     RT1I    (output) DOUBLE PRECISION RT2R    (output) DOUBLE
	     PRECISION RT2I    (output) DOUBLE PRECISION The real and
	     imaginary parts of the eigenvalues. If the eigenvalues are both
	     real, abs(RT1R) >= abs(RT2R); if the eigenvalues are a complex
	     conjugate pair, RT1I > 0.

     CS	     (output) DOUBLE PRECISION
	     SN	     (output) DOUBLE PRECISION Parameters of the rotation
	     matrix.

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