TESTING/EIG/zslect.f(3)

📦
version 3.12.1 · 2 versions
, in arch rolling

💅 TESTING/EIG/zslect.f(3) 💅

okay so this lil page comes straight from the Library Functions Manual, and it’s all about the zslect function. bestie, it’s giving “small function, big sorting-energy” ✨

🌸 NAME 🌸

TESTING/EIG/zslect.f — yep, that’s the file, and this is its page 💖

✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

  • logical function zslect (z) — ZSLECT

💖 Function/Subroutine Documentation 💖

logical function zslect (complex*16 z)

ZSLECT

🦋 Purpose 🦋

okay so here’s the tea: 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. iconic testing behavior, no cap.

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 🌸

  • Z — Z is COMPLEX*16; it’s the eigenvalue Z 💜

👑 Author 👑

  • Univ. of Tennessee
  • Univ. of California Berkeley
  • Univ. of Colorado Denver
  • NAG Ltd.

Definition at line 55 of file zslect.f.

🧚 Author 🧚

Generated automatically by Doxygen for LAPACK from the source code.

that’s the whole cute little page, bestie 🎀 source/version vibes: LAPACK Version 3.12.0, and the page is TESTING/EIG/zslect.f(3) — slay and bye 💅✨

📦 where this page comes from