TESTING/EIG/sslect.f(3) | Library Functions Manual | TESTING/EIG/sslect.f(3) |
NAME
TESTING/EIG/sslect.f
SYNOPSIS
Functions/Subroutines
logical function sslect (zr, zi)
SSLECT
Function/Subroutine Documentation
logical function sslect (real zr, real zi)
SSLECT
Purpose:
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.
Parameters
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.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 61 of file sslect.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.12.0 | LAPACK |