DGET01(3)

DGET01(3) 💅✨

okay so this page is from the dget01.f(3) manual — Library Functions Manual energy — and it's all about the DGET01 subroutine. bestie, it's giving linear algebra reconstruction realness, no cap. 🦋

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🎀 NAME 🎀

the NAME entry is literally this file path, and I'm obsessed:

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/dget01.f

periodt. that's the name. 💖

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✨ SYNOPSIS ✨

🧚 Functions/Subroutines

here's the synopsis, short and iconic:

subroutine DGET01 (m, n, a, lda, afac, ldafac, ipiv, rwork, resid)
    DGET01

no cap, that's the whole thing. 💅

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🫶 Function/Subroutine Documentation 🫶

this is the main character section, fr fr. the full subroutine signature is:

subroutine DGET01 (integer m, integer n, double precision, dimension( lda, * ) a, integer lda, double precision, dimension( ldafac, * ) afac, integer ldafac, integer, dimension( * ) ipiv, double precision, dimension( * ) rwork, double precision resid)
    DGET01

🍓 Purpose

the Doxygen source literally says:

!> DGET01 reconstructs a matrix A from its L*U factorization and
!> computes the residual
!>    norm(L*U - A) / ( N * norm(A) * EPS ),
!> where EPS is the machine epsilon.

so, translation: it reconstructs matrix A from its L*U factorization and computes that residual. where EPS is the machine epsilon. that's the tea. ☕

💜 Parameters

all the params, in order, no skips, no summaries:

• 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. N >= 0. ✨
• A — A is DOUBLE PRECISION array, dimension (LDA,N); the original M x N matrix A. 🎀
• LDA — LDA is INTEGER; the leading dimension of the array A. LDA >= max(1,M). 🦋
• AFAC — AFAC is DOUBLE PRECISION array, dimension (LDAFAC,N); the factored form of the matrix A. AFAC contains the factors L and U from the L*U factorization as computed by DGETRF. Overwritten with the reconstructed matrix, and then with the difference L*U - A. 🔥
• LDAFAC — LDAFAC is INTEGER; the leading dimension of the array AFAC. LDAFAC >= max(1,M). 🌸
• IPIV — IPIV is INTEGER array, dimension (N); the pivot indices from DGETRF. 👑
• RWORK — RWORK is DOUBLE PRECISION array, dimension (M). that's the whole description. 🧚
• RESID — RESID is DOUBLE PRECISION; norm(L*U - A) / ( N * norm(A) * EPS ). 🎀

🦋 Author

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

🌸 Definition at line 105 of file dget01.f

Definition at line 105 of file dget01.f. — that's the exact source location, bestie. 💅

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🌈 Author 🌈

Generated automatically by Doxygen for LAPACK from the source code.

not me being auto-generated by Doxygen for LAPACK from the source code 💀 — anyway, it's iconic.

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cute sign-off: this page is LAPACK Version 3.12.0, and the footer date/path situation is /home/abui...IN/dget01.f(3) — bye bestie, slay your L*U factorization 🫶💜