SPTT01(3)

okay bestie, this is SPTT01(3) from the LAPACK Library Functions Manual ✨💅 lowkey a whole little testing icon.

🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/sptt01.f

✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

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

💖 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. no cap, that's the whole mission 🫶

🍓 Parameters 🍓

• N — INTEGER; the order of the matrix A ✨
• D — REAL array, dimension (N); the n diagonal elements of the tridiagonal matrix A
• E — REAL array, dimension (N-1); the (n-1) subdiagonal elements of the tridiagonal matrix A
• DF — REAL array, dimension (N); the n diagonal elements of the factor L from the L*D*L' factorization of A
• EF — REAL array, dimension (N-1); the (n-1) subdiagonal elements of the factor L from the L*D*L' factorization of A
• WORK — REAL array, dimension (2*N)
• RESID — REAL; norm(L*D*L' - A) / (n * norm(A) * EPS)

👑 Author 👑

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

Definition at line 90 of file sptt01.f. 🎀

🫶 Author 🫶

Generated automatically by Doxygen for LAPACK from the source code.

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xoxo, LAPACK Version 3.12.0, page path /home/abui...IN/sptt01.f(3) — slay and bye 💅💖