TESTING/LIN/sptt01.f(3)

🎀 NAME 🎀

TESTING/LIN/sptt01.f — bestie, this is the LAPACK testing routine page for sptt01, and it's literally here to vibe-check a tridiagonal matrix reconstruction. 💖

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✨ SYNOPSIS ✨

Functions/Subroutines

• subroutine sptt01 (n, d, e, df, ef, work, resid) — SPTT01

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💅 Function/Subroutine Documentation 💅

subroutine sptt01 (integer n, real, dimension( * ) d, real, dimension( * ) e, real, dimension( * ) df, real, dimension( * ) ef, real, dimension( * ) work, real resid)

SPTT01

🌟 Purpose 🌟

Okay so SPTT01 reconstructs a tridiagonal matrix A from its L*D*L' factorization and computes the residual:

norm(L*D*L' - A) / ( n * norm(A) * EPS ),

where EPS is the machine epsilon. Periodt. 🫶

🍓 Parameters 🍓

• N — N is INTEGER. The order of the matrix A. Slay, we know the size now. ✨
• D — D is REAL array, dimension (N). The n diagonal elements of the tridiagonal matrix A. Iconic diagonal behavior. 💅
• E — E is REAL array, dimension (N-1). The (n-1) subdiagonal elements of the tridiagonal matrix A. Not me keeping track of every subdiagonal element 😭
• DF — DF is REAL array, dimension (N). The n diagonal elements of the factor L from the L*D*L' factorization of A. Main character factor energy. 👑
• EF — EF is REAL array, dimension (N-1). The (n-1) subdiagonal elements of the factor L from the L*D*L' factorization of A. Bestie, this is the subdiagonal lore. 🌸
• WORK — WORK is REAL array, dimension (2*N). Workspace, doing quiet background support like the real MVP. 🧚
• RESID — RESID is REAL. It's the residual norm(L*D*L' - A) / (n * norm(A) * EPS). The vibe check result itself, no cap. 🔥

👑 Author 👑

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

Definition at line 90 of file sptt01.f. 🎀

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🌈 Author 🌈

Generated automatically by Doxygen for LAPACK from the source code.

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💖 Stay slay, bestie — this cutie is from LAPACK Version 3.12.0, source TESTING/LIN/sptt01.f(3). 💅✨