DLASQ6(3)

💅 DLASQ6(3) — Library Functions Manual energy 💅

okay so bestie, welcome to the Library Functions Manual page for DLASQ6(3). This is the one about a tiny-but-iconic Fortran subroutine that does one dqd transform in ping-pong form. No cap, it’s giving numerical linear algebra main character energy. 🦋

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🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/dlasq6.f

That’s the file path, exactly. Bestie, it’s literally the name section, so here we are. 💖

✨ 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 💖

Here’s the full signature, character-for-character, because we do not play with code accuracy:

   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)

And the one-liner vibe: DLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr. Slay. ✨

🎀 Purpose 🎀

Okay so the purpose is literally this: DLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow. That’s it. That’s the assignment. Lowkey iconic. 💅

🌈 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. 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 🌟

This page was generated automatically by Doxygen for LAPACK from the source code. Fr fr. 💅

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That’s the whole manual page, bestie! Cute sign-off: LAPACK Version 3.12.0 — footer page /home/abui...RC/dlasq6.f(3) 💅✨