SRC/slasq4.f(3)

💖 NAME 💖

okay so bestie, this page is SRC/slasq4.f(3) from the Library Functions Manual, and the NAME is literally SRC/slasq4.f. 💅

✨ SYNOPSIS ✨

🧚 Functions/Subroutines 🧚

       subroutine slasq4 (i0, n0, z, pp, n0in, dmin, dmin1, dmin2, dn, dn1,
           dn2, tau, ttype, g)

SLASQ4 computes an approximation to the smallest eigenvalue using values of d from the previous transform. It’s used by sbdsqr. No cap. 🦋

🫶 Function/Subroutine Documentation 🫶

   subroutine slasq4 (integer i0, integer n0, real, dimension( * ) z, integer
       pp, integer n0in, real dmin, real dmin1, real dmin2, real dn, real dn1,
       real dn2, real tau, integer ttype, real g)

Same deal, spelled all the way out: SLASQ4 computes an approximation to the smallest eigenvalue using values of d from the previous transform. Used by sbdsqr. 💖

🌸 Purpose 🌸

SLASQ4 computes an approximation TAU to the smallest eigenvalue using values of d from the previous transform. That’s the whole purpose, bestie — iconic and focused. ✨

🎀 Parameters 🎀

• I0 — INTEGER. First index. 💫
• N0 — INTEGER. Last index. 🌈
• Z — REAL array, dimension ( 4*N0 ). Z holds the qd array. 🦋
• PP — INTEGER. PP=0 for ping, PP=1 for pong. 🏓
• N0IN — INTEGER. The value of N0 at start of EIGTEST. 🔥
• DMIN — REAL. Minimum value of d. 💜
• DMIN1 — REAL. Minimum value of d, excluding D( N0 ). 🫶
• DMIN2 — REAL. Minimum value of d, excluding D( N0 ) and D( N0-1 ). 😭
• DN — REAL. d(N). 🍓
• DN1 — REAL. d(N-1). 🌸
• DN2 — REAL. d(N-2). 🎀
• TAU — REAL. This is the shift. 👑
• TTYPE — INTEGER. Shift type. ⭐
• G — REAL. G is passed as an argument in order to save its value between calls to SLASQ4. 💅

👑 Author 👑

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

🔥 Further Details 🔥

CNST1 = 9/16

Definition at line 149 of file slasq4.f. 📍

🌈 Author 🌈

Generated automatically by Doxygen for LAPACK from the source code. 🤖✨

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💖 that’s the whole page, bestie — LAPACK Version 3.12.0, from SRC/slasq4.f(3). mwah 💖