SRC/dlarrr.f(3)

📦
version 3.12.1 · 7 versions
, in arch rolling

🎀 NAME 🎀

SRC/dlarrr.f — yes bestie, that's the name of this page. It's from the Library Functions Manual, page SRC/dlarrr.f(3), and it's giving tiny routine, serious accuracy decisions energy. 💅

✨ SYNOPSIS ✨

🦋 Functions/Subroutines 🦋

  • subroutine dlarrr (n, d, e, info) — DLARRR performs tests to decide whether the symmetric tridiagonal matrix T warrants expensive computations which guarantee high relative accuracy in the eigenvalues. No cap, that's the whole vibe. 🫶

🫶 Function/Subroutine Documentation 🫶

subroutine dlarrr (integer n, double precision, dimension( * ) d, double precision, dimension( * ) e, integer info)

DLARRR performs tests to decide whether the symmetric tridiagonal matrix T warrants expensive computations which guarantee high relative accuracy in the eigenvalues. 🔥

💖 Purpose: 💖

Bestie, this is the pre-flight vibe check. The routine performs tests to decide whether the symmetric tridiagonal matrix T warrants expensive computations which guarantee high relative accuracy in the eigenvalues. It's literally asking: are we spending the expensive bag for high relative accuracy, or not? 😭

🌸 Parameters 🌸

  • N — N is INTEGER; the order of the matrix. N > 0. 👑
  • D — D is DOUBLE PRECISION array, dimension (N); the diagonal elements of the tridiagonal matrix T, and there are N of them. 🍓
  • E — E is DOUBLE PRECISION array, dimension (N); on entry, the first (N-1) entries contain the subdiagonal elements of the tridiagonal matrix T; E(N) is set to ZERO. 🦋
  • INFO — INFO is INTEGER; and the values are:
    • INFO = 0(default) : the matrix warrants computations preserving relative accuracy. ✨
    • INFO = 1 : the matrix warrants computations guaranteeing only absolute accuracy. 💀

👑 Author 👑

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

🫶 Contributors: 🫶

  • Beresford Parlett, University of California, Berkeley, USA
  • Jim Demmel, University of California, Berkeley, USA
  • Inderjit Dhillon, University of Texas, Austin, USA
  • Osni Marques, LBNL/NERSC, USA
  • Christof Voemel, University of California, Berkeley, USA

Definition at line 93 of file dlarrr.f. 📍

👑 Author 👑

Generated automatically by Doxygen for LAPACK from the source code.

okay that's the page, bestie. Footer tea: this is LAPACK, Version 3.12.0, page SRC/dlarrr.f(3). Slay. 💅✨

📦 where this page comes from