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CentOS 7.0 - man page for slanv2 (centos section 3)

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 computes the Schur factorization of a real 2-by-2 nonsymmetric matrix in standard form. Function/Subroutine Documentation subroutine slanv2 (realA, realB, realC, realD, realRT1R, realRT1I, realRT2R, realRT2I, realCS, realSN) SLANV2 computes the Schur factorization of a real 2-by-2 nonsymmetric matrix in standard form. 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: September 2012 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 3.4.2 Tue Sep 25 2012 slanv2.f(3)