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/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/dslect.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/dslect.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/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

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Version 3.12.0 LAPACK