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LAPACK: Linear Algebra PACKage
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zslect.f File Reference

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Functions/Subroutines

logical function zslect (Z)
 ZSLECT More...
 

Function/Subroutine Documentation

logical function zslect ( complex*16  Z)

ZSLECT

Purpose:
 ZSLECT returns .TRUE. if the eigenvalue Z is to be selected,
 otherwise it returns .FALSE.
 It is used by ZCHK41 to test if ZGEES succesfully sorts eigenvalues,
 and by ZCHK43 to test if ZGEESX succesfully sorts eigenvalues.

 The common block /SSLCT/ controls how eigenvalues are selected.
 If SELOPT = 0, then ZSLECT return .TRUE. when real(Z) is less than
 zero, and .FALSE. otherwise.
 If SELOPT is at least 1, ZSLECT returns SELVAL(SELOPT) and adds 1
 to SELOPT, cycling back to 1 at SELMAX.
Parameters
[in]Z
          Z is COMPLEX*16
          The eigenvalue Z.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date
November 2011

Definition at line 57 of file zslect.f.