SSYT01(3)

💅 SSYT01(3) — Library Functions Manual 💅

okay bestie, this is the ssyt01.f(3) page from the Library Functions Manual, and we are gonna get into it 💖

🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/ssyt01.f

✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

subroutine SSYT01 (uplo, n, a, lda, afac, ldafac, ipiv, c, ldc, rwork,
    resid)
    SSYT01

🦋 Function/Subroutine Documentation 🦋

🫶 subroutine SSYT01 (...)

subroutine SSYT01 (character uplo, integer n, real, dimension( lda, * ) a,
    integer lda, real, dimension( ldafac, * ) afac, integer ldafac, integer,
    dimension( * ) ipiv, real, dimension( ldc, * ) c, integer ldc, real,
    dimension( * ) rwork, real resid)

SSYT01

💖 Purpose 💖

okay so SSYT01 reconstructs a symmetric indefinite matrix A from its block L*D*L' or U*D*U' factorization and computes the residual

norm( C - A ) / ( N * norm(A) * EPS ),

where C is the reconstructed matrix and EPS is the machine epsilon. periodt 💅

🌸 Parameters 🌸

• UPLO — UPLO is CHARACTER*1. It specifies whether the upper or lower triangular part of the symmetric matrix A is stored: = 'U': Upper triangular, = 'L': Lower triangular ✨
• N — N is INTEGER. The number of rows and columns of the matrix A. N >= 0.
• A — A is REAL array, dimension (LDA,N). The original symmetric matrix A.
• LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= max(1,N).
• AFAC — AFAC is REAL array, dimension (LDAFAC,N). The factored form of the matrix A. AFAC contains the block diagonal matrix D and the multipliers used to obtain the factor L or U from the block L*D*L' or U*D*U' factorization as computed by SSYTRF 🔥
• LDAFAC — LDAFAC is INTEGER. The leading dimension of the array AFAC. LDAFAC >= max(1,N).
• IPIV — IPIV is INTEGER array, dimension (N). The pivot indices from SSYTRF.
• C — C is REAL array, dimension (LDC,N).
• LDC — LDC is INTEGER. The leading dimension of the array C. LDC >= max(1,N).
• RWORK — RWORK is REAL array, dimension (N).
• RESID — RESID is REAL. If UPLO = 'L', norm(L*D*L' - A) / ( N * norm(A) * EPS ); if UPLO = 'U', norm(U*D*U' - A) / ( N * norm(A) * EPS ) 👑

👑 Author 👑

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

Definition at line 122 of file ssyt01.f.

📜 Author 📜

Generated automatically by Doxygen for LAPACK from the source code.

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xoxo, your manual bestie 💜 — LAPACK Version 3.12.0, footer source: /home/abui...IN/ssyt01.f(3) ✨