SSLECT returns .TRUE. if the eigenvalue ZR+sqrt(-1)*ZI is to be


 selected, and otherwise it returns .FALSE.


 It is used by SCHK41 to test if SGEES successfully sorts eigenvalues,


 and by SCHK43 to test if SGEESX successfully sorts eigenvalues.


 The common block /SSLCT/ controls how eigenvalues are selected.


 If SELOPT = 0, then SSLECT return .TRUE. when ZR is less than zero,


 and .FALSE. otherwise.


 If SELOPT is at least 1, SSLECT returns SELVAL(SELOPT) and adds 1


 to SELOPT, cycling back to 1 at SELMAX.

ZR

          ZR is REAL


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

ZI

          ZI is REAL


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

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