SRC/DEPRECATED/sgeqrs.f(3)

📦
version 3.12.1 · 3 versions
, in arch rolling

🌸 NAME 🌸

Bestie, this is the page for SRC/DEPRECATED/sgeqrs.f — and it's hanging out in the Library Functions Manual 💖. The file path has DEPRECATED right there in the name, iykyk 👀, but every deet is still here for you.

✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

  • subroutine sgeqrs (m, n, nrhs, a, lda, tau, b, ldb, work, lwork, info) — this is SGEQRS, the main character of the page 🫶.

💖 Function/Subroutine Documentation 💖

subroutine sgeqrs (integer m, integer n, integer nrhs, real, dimension( lda,
     * ) a, integer lda, real, dimension( * ) tau, real, dimension( ldb, * )
     b, integer ldb, real, dimension( lwork ) work, integer lwork, integer
     info)

SGEQRS ✨

🎯 Purpose 🎯

Okay so this one solves the least squares problem

min || A*X - B ||

using the QR factorization

A = Q*R

computed by SGEQRF. That's the whole vibe 💅.

🧮 Parameters 🧮

  • M — INTEGER. The number of rows of the matrix A. M >= 0.
  • N — INTEGER. The number of columns of the matrix A. M >= N >= 0.
  • NRHS — INTEGER. The number of columns of B. NRHS >= 0.
  • A — REAL array, dimension (LDA,N). Details of the QR factorization of the original matrix A as returned by SGEQRF.
  • LDA — INTEGER. The leading dimension of the array A. LDA >= M.
  • TAU — REAL array, dimension (N). Details of the orthogonal matrix Q.
  • B — REAL array, dimension (LDB,NRHS). On entry, the m-by-nrhs right hand side matrix B. On exit, the n-by-nrhs solution matrix X.
  • LDB — INTEGER. The leading dimension of the array B. LDB >= M.
  • WORK — REAL array, dimension (LWORK).
  • LWORK — INTEGER. The length of the array WORK. LWORK must be at least NRHS, and should be at least NRHS*NB, where NB is the block size for this environment.
  • INFO — INTEGER.
    • = 0: successful exit
    • < 0: if INFO = -i, the i-th argument had an illegal value

👑 Author 👑

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

Definition at line 119 of file sgeqrs.f.

🧚 Author 🧚

Generated automatically by Doxygen for LAPACK from the source code.

Later, bestie! 💜 Signing off with the footer energy: LAPACK · Version 3.12.0 · SRC/DEPRECATED/sgeqrs.f(3) — and there's no date on this page, so no invented date, periodt 🌈.

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