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LAPACK
3.5.0
LAPACK: Linear Algebra PACKage
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Functions/Subroutines | |
LOGICAL function | cslect (Z) |
CSLECT |
LOGICAL function cslect | ( | complex | Z | ) |
CSLECT
CSLECT returns .TRUE. if the eigenvalue Z is to be selected, otherwise it returns .FALSE. It is used by CCHK41 to test if CGEES succesfully sorts eigenvalues, and by CCHK43 to test if CGEESX succesfully sorts eigenvalues. The common block /SSLCT/ controls how eigenvalues are selected. If SELOPT = 0, then CSLECT return .TRUE. when real(Z) is less than zero, and .FALSE. otherwise. If SELOPT is at least 1, CSLECT returns SELVAL(SELOPT) and adds 1 to SELOPT, cycling back to 1 at SELMAX.
[in] | Z | Z is COMPLEX The eigenvalue Z. |
Definition at line 57 of file cslect.f.