/home/abui...D/sgeqrs.f(3)

📦 version 3.12.0, in opensuse-leap 16.0

💖 /home/abui...D/sgeqrs.f(3) 💖

okay bestie, this page is straight from the Library Functions Manual, and it’s giving Fortran LAPACK subroutine main character energy. We’re talking about SGEQRS, and no cap, it’s here to solve least squares problems with QR factorization. Slay. ✨

🌸 NAME 🌸

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

✨ SYNOPSIS ✨

🧚 Functions/Subroutines 🧚

   subroutine SGEQRS (m, n, nrhs, a, lda, tau, b, ldb, work, lwork, info)
           SGEQRS

👑 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 vibe, bestie. 💅

💖 Parameters 💖

  • M — M is INTEGER. The number of rows of the matrix A. M >= 0.
  • N — N is INTEGER. The number of columns of the matrix A. M >= N >= 0.
  • NRHS — NRHS is INTEGER. The number of columns of B. NRHS >= 0.
  • A — A is REAL array, dimension (LDA,N). Details of the QR factorization of the original matrix A as returned by SGEQRF.
  • LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= M.
  • TAU — TAU is REAL array, dimension (N). Details of the orthogonal matrix Q.
  • B — B is 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 — LDB is INTEGER. The leading dimension of the array B. LDB >= M.
  • WORK — WORK is REAL array, dimension (LWORK).
  • LWORK — LWORK is 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 — INFO is 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.

okay bestie, that’s the whole page! 💅 source/version check: LAPACK Version 3.12.0, page /home/abui...D/sgeqrs.f(3). Go solve those least squares problems responsibly, fr fr 🫶✨

📦 where this page comes from