SGET01(3)

✨ SGET01(3) ✨ — like, the LAPACK testing file sget01.f bestie 💅

okay so real quick, this page lives in the Library Functions Manual section, and it's documenting /home/abui...IN/sget01.f(3) — yes the path is giving "I was built in someone's rpmbuild directory" and honestly? iconic. 🎀

---

🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/sget01.f

like… that's the whole name. it's a whole path, bestie. she's long, she's specific, she's not sorry. 🦋

---

⭐ SYNOPSIS ⭐

Functions/Subroutines

subroutine SGET01 (m, n, a, lda, afac, ldafac, ipiv, rwork, resid)

SGET01 — that's her. that's the girl. 👑

---

💖 Function/Subroutine Documentation 💖

subroutine SGET01 (integer m, integer n, real, dimension( lda, * ) a,
    integer lda, real, dimension( ldafac, * ) afac, integer ldafac, integer,
    dimension( * ) ipiv, real, dimension( * ) rwork, real resid)

SGET01

🫶 Purpose:

!>
!> SGET01 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 basically the vibe check here is: take a matrix A, rebuild her from her L*U factorization, and then compute that residual formula up there — norm(L*U - A) / ( N * norm(A) * EPS ) — where EPS is the machine epsilon. no cap, that's the whole job. 🧚

---

🌈 Parameters 🌈

• M — M is INTEGER, bestie. it's the number of rows of the matrix A. and like, M >= 0, obviously. 💜
• N — N is INTEGER. number of columns of the matrix A. constraint is N >= 0. periodt. ✨
• A — A is REAL array, dimension (LDA,N). this is the original M x N matrix A. the main character, honestly. 🌟
• LDA — LDA is INTEGER — the leading dimension of the array A. rule is LDA >= max(1,M). don't argue with her. 💅
• AFAC — AFAC is REAL array, dimension (LDAFAC,N). this one's the factored form of the matrix A — she contains the factors L and U from the L*U factorization as computed by SGETRF. and heads up 🚨: she gets overwritten with the reconstructed matrix, and then again with the difference L*U - A. she's been through some things. 😭
• LDAFAC — LDAFAC is INTEGER — leading dimension of the array AFAC. LDAFAC >= max(1,M). same energy as LDA, different girl. 🎀
• IPIV — IPIV is INTEGER array, dimension (N). these are the pivot indices from SGETRF. slay. 🔥
• RWORK — RWORK is REAL array, dimension (M). that's it. that's the whole description. she's mysterious. 🦋
• RESID — RESID is REAL, and it equals norm(L*U - A) / ( N * norm(A) * EPS ). the final girl. the payoff. the number you actually came here for. 👑

---

👑 Author 👑

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

the whole squad contributed, we love a collaborative moment 🫶

Definition at line 105 of file sget01.f.

so if you need to find her in the wild, line 105, file sget01.f. iykyk. 📍

---

💀 Author (yes, again)

Generated automatically by Doxygen for LAPACK from the source code. so she didn't even write this herself, a robot did, and honestly? she ate. 🤖✨

---

okay that's the page!! stay hydrated, check your array bounds, and remember — leading dimensions are >= max(1,M), always and forever 💖

🌺 this has been LAPACK, Version 3.12.0, dated /home/abui...IN/sget01.f(3) — mwah, bye bestie!! 🎀🦋💜