ZSLECT returns .TRUE. if the eigenvalue Z is to be selected,


 otherwise it returns .FALSE.


 It is used by ZCHK41 to test if ZGEES successfully sorts eigenvalues,


 and by ZCHK43 to test if ZGEESX successfully 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.

Z

          Z is COMPLEX*16


          The eigenvalue Z.

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