TESTING/LIN/dgeqls.f(3)

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version 3.12.1 · 2 versions
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💅 TESTING/LIN/dgeqls.f 💅

okay so bestie, this is the Library Functions Manual page for TESTING/LIN/dgeqls.f(3) — yes, the dgeqls subroutine has main character energy and we're gonna get into it. No cap. 🫶

🌸 NAME 🌸

TESTING/LIN/dgeqls.f

✨ SYNOPSIS ✨

🧚 Functions/Subroutines

  • subroutine dgeqls (m, n, nrhs, a, lda, tau, b, ldb, work, lwork, info) — DGEQLS

💖 Function/Subroutine Documentation 💖

Here's the full signature, literally verbatim:

subroutine dgeqls (integer m, integer n, integer nrhs, double precision,
     dimension( lda, * ) a, integer lda, double precision, dimension( * )
     tau, double precision, dimension( ldb, * ) b, integer ldb, double
     precision, dimension( lwork ) work, integer lwork, integer info)

DGEQLS

🎯 Purpose

Solve the least squares problem:

min || A*X - B ||

using the QL factorization:

A = Q*L

computed by DGEQLF.

🧾 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 DOUBLE PRECISION array, dimension (LDA,N). Details of the QL factorization of the original matrix A as returned by DGEQLF.
  • LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= M.
  • TAU — TAU is DOUBLE PRECISION array, dimension (N). Details of the orthogonal matrix Q.
  • B — B is DOUBLE PRECISION array, dimension (LDB,NRHS). On entry, the m-by-nrhs right hand side matrix B. On exit, the n-by-nrhs solution matrix X, stored in rows m-n+1:m.
  • LDB — LDB is INTEGER. The leading dimension of the array B. LDB >= M.
  • WORK — WORK is DOUBLE PRECISION 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 120 of file dgeqls.f.

👑 Author

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okay that's the whole page, bestie — LAPACK Version 3.12.0, TESTING/LIN/dgeqls.f(3), and we're out 💖✨

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