slanv2.f(3)							      LAPACK							       slanv2.f(3)

NAME

       slanv2.f -

SYNOPSIS

   Functions/Subroutines
       subroutine slanv2 (A, B, C, D, RT1R, RT1I, RT2R, RT2I, CS, SN)
	   SLANV2

Function/Subroutine Documentation
   subroutine slanv2 (realA, realB, realC, realD, realRT1R, realRT1I, realRT2R, realRT2I, realCS, realSN)
       SLANV2

       Purpose:

	    SLANV2 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.

       Parameters:
	   A

		     A is REAL

	   B

		     B is REAL

	   C

		     C is REAL

	   D

		     D is REAL
		     On entry, the elements of the input matrix.
		     On exit, they are overwritten by the elements of the
		     standardised Schur form.

	   RT1R

		     RT1R is REAL

	   RT1I

		     RT1I is REAL

	   RT2R

		     RT2R is REAL

	   RT2I

		     RT2I is REAL
		     The real and imaginary parts of the eigenvalues. If the
		     eigenvalues are a complex conjugate pair, RT1I > 0.

	   CS

		     CS is REAL

	   SN

		     SN is REAL
		     Parameters of the rotation matrix.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Further Details:

	     Modified by V. Sima, Research Institute for Informatics, Bucharest,
	     Romania, to reduce the risk of cancellation errors,
	     when computing real eigenvalues, and to ensure, if possible, that
	     abs(RT1R) >= abs(RT2R).

       Definition at line 128 of file slanv2.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       slanv2.f(3)