SLASQ6(3)

📦 version 3.12.0, in opensuse-leap 16.0

Okay bestie, welcome to the SLASQ6(3) page from the Library Functions Manual — this is the source file that tells you all about one tiny but iconic LAPACK subroutine. 💖

💖 NAME 💖

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/slasq6.f

That’s the file this manual page is repping. Slay. ✨

🌸 SYNOPSIS 🌸

✨ Functions/Subroutines ✨

subroutine SLASQ6 (i0, n0, z, pp, dmin, dmin1, dmin2, dn, dnm1, dnm2)

SLASQ6 computes one dqd transform in ping-pong form. It’s used by sbdsqr and sstegr. Periodt. 💅

💅 Function/Subroutine Documentation 💅

subroutine SLASQ6 (integer i0, integer n0, real, dimension( * ) z, integer
     pp, real dmin, real dmin1, real dmin2, real dn, real dnm1, real dnm2)

SLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr. Yes, same sentence again — it’s important, okay? 😌

🎀 Purpose 🎀

SLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow.

No cap, that’s the whole purpose. Shift equal to zero? Iconic. Underflow and overflow protection? Highkey essential. 🔥

🌈 Parameters 🌈

  • I0 — I0 is INTEGER. First index. 💫
  • N0 — N0 is INTEGER. Last index. 🫶
  • Z — Z is REAL array, dimension ( 4*N ). Z holds the qd array. EMIN is stored in Z(4*N0) to avoid an extra argument. Very “we don’t need another parameter” of it. 😌
  • PP — PP is INTEGER. PP=0 for ping, PP=1 for pong. Ping-pong bestie! 🏓
  • DMIN — DMIN is REAL. Minimum value of d. 🍓
  • DMIN1 — DMIN1 is REAL. Minimum value of d, excluding D( N0 ). ✨
  • DMIN2 — DMIN2 is REAL. Minimum value of d, excluding D( N0 ) and D( N0-1 ). 💅
  • DN — DN is REAL. d(N0), the last value of d. 👑
  • DNM1 — DNM1 is REAL. d(N0-1). 🦋
  • DNM2 — DNM2 is REAL. d(N0-2). 🌸

👑 Author 👑

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

Definition at line 117 of file slasq6.f.

👑 Author 👑

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💖 Cute lil sign-off: this page is from LAPACK, Version 3.12.0, and the footer source path is /home/abui...RC/slasq6.f(3). The footer doesn’t list a date, so no date to report — but the vibe is eternal. Bye bestie! 💅✨

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