lasq6(3)

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version 3.12.1 · 9 versions
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💅 lasq6(3) — Library Functions Manual, but make it cute ✨

🌸 NAME 🌸

lasq6 — lasq6: dqds step — okay so it's giving dqds step, bestie, and we're obsessed 💖

✨ SYNOPSIS ✨

💖 Functions 💖

  • subroutine dlasq6 (i0, n0, z, pp, dmin, dmin1, dmin2, dn, dnm1, dnm2) — DLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.
  • subroutine slasq6 (i0, n0, z, pp, dmin, dmin1, dmin2, dn, dnm1, dnm2) — SLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

🌈 Detailed Description 🌈

okay so this is the doorway to the full function docs — keep scrolling, bestie, the tea is right there 💖

👑 Function Documentation 👑

🦋 dlasq6 🦋

subroutine dlasq6 (integer i0, integer n0, double precision, dimension( * ) z, integer pp, double precision dmin, double precision dmin1, double precision dmin2, double precision dn, double precision dnm1, double precision dnm2)

DLASQ6 computes one dqd transform in ping-pong form — and yes, it's used by sbdsqr and sstegr. ✨

💜 Purpose 💜

okay so DLASQ6 computes one dqd transform — with shift equal to zero, bestie — in ping-pong form, and it has protection against underflow and overflow. That's the whole point. 💅

💖 Parameters 💖

  • I0 — I0 is INTEGER. First index, no cap.
  • N0 — N0 is INTEGER. Last index.
  • Z — Z is DOUBLE PRECISION array, dimension ( 4*N ). It holds the qd array, and EMIN is stored in Z(4*N0) to avoid an extra argument — efficiency queen 💅
  • PP — PP is INTEGER. PP=0 for ping, PP=1 for pong.
  • DMIN — DMIN is DOUBLE PRECISION. Minimum value of d.
  • DMIN1 — DMIN1 is DOUBLE PRECISION. Minimum value of d, excluding D( N0 ).
  • DMIN2 — DMIN2 is DOUBLE PRECISION. Minimum value of d, excluding D( N0 ) and D( N0-1 ).
  • DN — DN is DOUBLE PRECISION. d(N0), the last value of d.
  • DNM1 — DNM1 is DOUBLE PRECISION. d(N0-1).
  • DNM2 — DNM2 is DOUBLE PRECISION. d(N0-2).

🌟 Author 🌟

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

Definition at line 117 of file dlasq6.f.

🦋 slasq6 🦋

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 — and yes, it's used by sbdsqr and sstegr. ✨

💜 Purpose 💜

okay so SLASQ6 computes one dqd transform — with shift equal to zero, bestie — in ping-pong form, and it has protection against underflow and overflow. That's the whole point. 💅

💖 Parameters 💖

  • I0 — I0 is INTEGER. First index, no cap.
  • N0 — N0 is INTEGER. Last index.
  • Z — Z is REAL array, dimension ( 4*N ). It holds the qd array, and EMIN is stored in Z(4*N0) to avoid an extra argument — efficiency queen 💅
  • PP — PP is INTEGER. PP=0 for ping, PP=1 for pong.
  • 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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Signed off with love: source/version is LAPACK, Version 3.12.0, and this page is lasq6(3). The footer doesn't print a date, so no fake date era — mwah 💋

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