TESTING/LIN/drzt01.f(3)

📦
version 3.12.1 · 3 versions
, in arch rolling

💖 NAME 💖

okay so bestie, welcome to TESTING/LIN/drzt01.f(3) — yes, she’s living in the LAPACK Library Functions Manual, and this page is all about the function DRZT01. The NAME itself is exactly this:

TESTING/LIN/drzt01.f

✨ SYNOPSIS ✨

🦋 Functions/Subroutines 🦋

  • double precision function drzt01 (m, n, a, af, lda, tau, work, lwork) — DRZT01

💅 Function/Subroutine Documentation 💅

Her whole vibe is DRZT01, and here’s the full signature, copied exactly so nobody comes for me:

double precision function drzt01 (integer m, integer n, double precision,
    dimension( lda, * ) a, double precision, dimension( lda, * ) af, integer
    lda, double precision, dimension( * ) tau, double precision, dimension(
    lwork ) work, integer lwork)

🎀 Purpose 🎀

DRZT01 returns

|| A - R*Q || / ( M * eps * ||A|| )

for an upper trapezoidal A that was factored with DTZRZF.

🌸 Parameters 🌸

  • M — M is INTEGER. The number of rows of the matrices A and AF.
  • N — N is INTEGER. The number of columns of the matrices A and AF.
  • A — A is DOUBLE PRECISION array, dimension (LDA,N). The original upper trapezoidal M by N matrix A.
  • AF — AF is DOUBLE PRECISION array, dimension (LDA,N). The output of DTZRZF for input matrix A. The lower triangle is not referenced.
  • LDA — LDA is INTEGER. The leading dimension of the arrays A and AF.
  • TAU — TAU is DOUBLE PRECISION array, dimension (M). Details of the Householder transformations as returned by DTZRZF.
  • WORK — WORK is DOUBLE PRECISION array, dimension (LWORK).
  • LWORK — LWORK is INTEGER. The length of the array WORK. LWORK >= m*n + m*nb.

👑 Author 👑

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

Definition at line 96 of file drzt01.f.

👑 Author 👑

Generated automatically by Doxygen for LAPACK from the source code.

mwah 💋 — footer check, bestie: source LAPACK, version Version 3.12.0, page tag TESTING/LIN/drzt01.f(3). There’s no separate date printed in this footer text, so I’m not inventing one — periodt 🫶💖

📦 where this page comes from