SRC/dlasq6.f(3)

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SRC/dlasq6.f(3) 🎀

okay bestie, welcome to the Library Functions Manual page for SRC/dlasq6.f(3) — yes, we're getting into a LAPACK subroutine today, and every type and detail is staying exactly where it belongs. 💅

🦋 NAME

SRC/dlasq6.f — that's the name, periodt. ✨

✨ SYNOPSIS ✨

Functions/Subroutines

  • 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.

🌸 Function/Subroutine Documentation 🌸

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. Used by sbdsqr and sstegr.

💖 Purpose 💖

DLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow. That's the whole vibe check. 🫶

🎀 Parameters 🎀

  • I0 — I0 is INTEGER. First index. 🌟
  • N0 — N0 is INTEGER. Last index. 🌈
  • Z — Z is DOUBLE PRECISION array, dimension ( 4*N ). Z holds the qd array, and EMIN is stored in Z(4*N0) to avoid an extra argument. 🦋
  • 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.

🌈 Author 🌈

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💜 okay bestie, that's the whole page. Cute little footer sign-off: LAPACK, Version 3.12.0, page SRC/dlasq6.f(3) — and there's no date printed on this footer, so I'm not inventing one. Slay. 💅✨

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