SRC/DEPRECATED/dgelqs.f(3)

💖 NAME 💖

SRC/DEPRECATED/dgelqs.f

okay bestie, this is the SRC/DEPRECATED/dgelqs.f(3) page from the Library Functions Manual, and the function is DGELQS. She’s giving “deprecated path but still got lore.” 💅✨

✨ SYNOPSIS ✨

🦋 Functions/Subroutines 🦋

• dgelqs — DGELQS

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

🎀 Function/Subroutine Documentation 🎀

   subroutine dgelqs (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)

DGELQS — that’s the subroutine, bestie. 🫶

🦋 Purpose 🦋

!>
!> Compute a minimum-norm solution
!>     min || A*X - B ||
!> using the LQ factorization
!>     A = L*Q
!> computed by DGELQF.
!>

🌸 Parameters 🌸

• M — M is INTEGER; it’s the number of rows of the matrix A. Constraint: M >= 0. 💖
• N — N is INTEGER; it’s the number of columns of the matrix A. Constraint: N >= M >= 0. ✨
• NRHS — NRHS is INTEGER; it’s the number of columns of B. Constraint: NRHS >= 0. 🎀
• A — A is DOUBLE PRECISION array, dimension (LDA,N). It holds details of the LQ factorization of the original matrix A as returned by DGELQF. 🦋
• LDA — LDA is INTEGER; it’s the leading dimension of the array A. Constraint: LDA >= M. 🌸
• TAU — TAU is DOUBLE PRECISION array, dimension (M). It holds details of the orthogonal matrix Q. 💅
• B — B is DOUBLE PRECISION array, dimension (LDB,NRHS). On entry, it’s the m-by-nrhs right hand side matrix B. On exit, it’s the n-by-nrhs solution matrix X. 🫶
• LDB — LDB is INTEGER; it’s the leading dimension of the array B. Constraint: LDB >= N. 🔥
• WORK — WORK is DOUBLE PRECISION array, dimension (LWORK). 👑
• LWORK — LWORK is INTEGER; it’s 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 means successful exit, and < 0 means 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 dgelqs.f.

📝 Author 📝

Generated automatically by Doxygen for LAPACK from the source code.

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🌈 and that’s the whole page, bestie: LAPACK Version 3.12.0, page SRC/DEPRECATED/dgelqs.f(3), and the Library Functions Manual energy is right there too. There’s no date in that footer, so I’m not inventing one — no cap. 💖✨