SRC/slasq5.f(3)

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💅 SRC/slasq5.f(3) — bestie edition, straight from the Library Functions Manual 💅

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🎀 NAME 🎀

SRC/slasq5.f

✨ SYNOPSIS ✨

🧚 Functions/Subroutines 🧚

subroutine slasq5 (i0, n0, z, pp, tau, sigma, dmin, dmin1, dmin2, dn, dnm1, dnm2, ieee, eps)

SLASQ5 computes one dqds transform in ping-pong form. Used by sbdsqr and sstegr. Slay. ✨

🦋 Function/Subroutine Documentation 🦋

subroutine slasq5 (integer i0, integer n0, real, dimension( * ) z, integer pp, real tau, real sigma, real dmin, real dmin1, real dmin2, real dn, real dnm1, real dnm2, logical ieee, real eps)

SLASQ5 computes one dqds transform in ping-pong form. Used by sbdsqr and sstegr. 🫶

🌸 Purpose 🌸

Okay so SLASQ5 computes one dqds transform in ping-pong form — one version for IEEE machines, another for non IEEE machines. That's the whole vibe. 💅

🍓 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. 🦋
  • PP — PP is INTEGER; PP=0 for ping, PP=1 for pong. 🏓
  • TAU — TAU is REAL; this is the shift. ✨
  • SIGMA — SIGMA is REAL; this is the accumulated shift up to this step. 🌸
  • 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). ⭐
  • IEEE — IEEE is LOGICAL; flag for IEEE or non IEEE arithmetic. 🧚
  • EPS — EPS is REAL; this is the value of epsilon used. 💜

💜 Author 💜

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

Definition at line 142 of file slasq5.f.

🫶 Author 🫶

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