SRC/csytrs_aa_2stage.f(3)

💅 SRC/csytrs_aa_2stage.f(3) 💅

okay so this page is from the Library Functions Manual, and it's literally all about SRC/csytrs_aa_2stage.f — a Fortran file with main-character energy. 💖

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🛠️ SYNOPSIS 🛠️

✨ Functions/Subroutines ✨

subroutine csytrs_aa_2stage (uplo, n, nrhs, a, lda, tb, ltb, ipiv,
    ipiv2, b, ldb, info)

That's the whole vibe: CSYTRS_AA_2STAGE. 👑

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📚 Function/Subroutine Documentation 📚

subroutine csytrs_aa_2stage (character uplo, integer n, integer nrhs,
    complex, dimension( lda, * ) a, integer lda, complex, dimension( * ) tb,
    integer ltb, integer, dimension( * ) ipiv, integer, dimension( * )
    ipiv2, complex, dimension( ldb, * ) b, integer ldb, integer info)

CSYTRS_AA_2STAGE — say it with your chest, bestie. 🫶

🎯 Purpose 🎯

CSYTRS_AA_2STAGE solves a system of linear equations A*X = B with a complex symmetric matrix A using the factorization A = U**T*T*U or A = L*T*L**T computed by CSYTRF_AA_2STAGE. 🧚

🎛️ Parameters 🎛️

• UPLO — CHARACTER*1. This tells you if the details of the factorization are stored as an upper or lower triangular matrix. Iconic little switch, honestly.
  • = 'U': Upper triangular, form is A = U**T*T*U;
  • = 'L': Lower triangular, form is A = L*T*L**T.
• N — INTEGER. The order of the matrix A. N >= 0. No negative girlies allowed.
• NRHS — INTEGER. The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0.
• A — COMPLEX array, dimension (LDA,N). Details of factors computed by CSYTRF_AA_2STAGE. the factorization tea lives here 💜
• LDA — INTEGER. The leading dimension of the array A. LDA >= max(1,N).
• TB — COMPLEX array, dimension (LTB). Details of factors computed by CSYTRF_AA_2STAGE.
• LTB — INTEGER. The size of the array TB. LTB >= 4*N. yes, 4*N, not a typo, periodt.
• IPIV — INTEGER array, dimension (N). Details of the interchanges as computed by CSYTRF_AA_2STAGE.
• IPIV2 — INTEGER array, dimension (N). Details of the interchanges as computed by CSYTRF_AA_2STAGE.
• B — COMPLEX array, dimension (LDB,NRHS). On entry, the right hand side matrix B. On exit, the solution matrix X. glow-up moment: B comes in, X walks out 💅
• LDB — INTEGER. The leading dimension of the array B. LDB >= max(1,N).
• INFO — INTEGER.

= 0:  successful exit
< 0:  if INFO = -i, the i-th argument had an illegal value

👑 Author 👑

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

📍 Definition 📍

Definition at line 137 of file csytrs_aa_2stage.f. 🎀

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✍️ Author ✍️

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footer vibe check: this is LAPACK Version 3.12.0, from source SRC/csytrs_aa_2stage.f(3) — no date on the footer, so I'm not inventing one, bestie 😭💖