TESTING/EIG/dslect.f(3)    Library Functions Manual    TESTING/EIG/dslect.f(3)

NAME
       TESTING/EIG/dslect.f

SYNOPSIS
   Functions/Subroutines
       logical function dslect (zr, zi)
           DSLECT

Function/Subroutine Documentation
   logical function dslect (double precision zr, double precision zi)
       DSLECT

       Purpose:


            DSLECT returns .TRUE. if the eigenvalue ZR+sqrt(-1)*ZI is to be
            selected, and otherwise it returns .FALSE.
            It is used by DCHK41 to test if DGEES successfully sorts eigenvalues,
            and by DCHK43 to test if DGEESX successfully sorts eigenvalues.

            The common block /SSLCT/ controls how eigenvalues are selected.
            If SELOPT = 0, then DSLECT return .TRUE. when ZR is less than zero,
            and .FALSE. otherwise.
            If SELOPT is at least 1, DSLECT returns SELVAL(SELOPT) and adds 1
            to SELOPT, cycling back to 1 at SELMAX.

       Parameters
           ZR

                     ZR is DOUBLE PRECISION
                     The real part of a complex eigenvalue ZR + i*ZI.

           ZI

                     ZI is DOUBLE PRECISION
                     The imaginary part of a complex eigenvalue ZR + i*ZI.

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 61 of file dslect.f.

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

LAPACK                          Version 3.12.0         TESTING/EIG/dslect.f(3)