ZHETRS_AA_2STAGE(3)

💅 NAME 🎀

okay bestie, we're in the Library Functions Manual corner for /home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/zhetrs_aa_2stage.f — yes, that's the whole NAME vibe. It's giving linear algebra subroutine with main character energy. 💖

✨ SYNOPSIS ✨

🦋 Functions/Subroutines 🦋

• subroutine ZHETRS_AA_2STAGE (uplo, n, nrhs, a, lda, tb, ltb, ipiv, ipiv2, b, ldb, info) — the subroutine signature, right here, no cap. 💅

🧚 Function/Subroutine Documentation 🧚

Here's the full signature, copied exactly because we do not play with literal code:

subroutine ZHETRS_AA_2STAGE (character uplo, integer n, integer nrhs,
    complex*16, dimension( lda, * ) a, integer lda, complex*16, dimension( *
    ) tb, integer ltb, integer, dimension( * ) ipiv, integer, dimension( * )
    ipiv2, complex*16, dimension( ldb, * ) b, integer ldb, integer info)

ZHETRS_AA_2STAGE — yes, that's the name again, slay. 👑

🎀 Purpose 🎀

Bestie, the purpose is literally this: ZHETRS_AA_2STAGE solves a system of linear equations A*X = B with a hermitian matrix A, using the factorization A = U**H*T*U or A = L*T*L**H computed by ZHETRF_AA_2STAGE. That's the whole vibe. ✨

💅 Parameters 💅

UPLO

• UPLO is CHARACTER*1 — it specifies whether the details of the factorization are stored as an upper or lower triangular matrix.
  • = 'U': upper triangular, form is A = U**H*T*U;
  • = 'L': lower triangular, form is A = L*T*L**H.

N

• N is INTEGER — the order of the matrix A. N >= 0. 🫶

NRHS

• NRHS is INTEGER — the number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0.

A

• A is COMPLEX*16 array, dimension (LDA,N) — details of factors computed by ZHETRF_AA_2STAGE.

LDA

• LDA is INTEGER — the leading dimension of the array A. LDA >= max(1,N).

TB

• TB is COMPLEX*16 array, dimension (LTB) — details of factors computed by ZHETRF_AA_2STAGE.

LTB

• LTB is INTEGER — the size of the array TB. LTB >= 4*N.

IPIV

• IPIV is INTEGER array, dimension (N) — details of the interchanges as computed by ZHETRF_AA_2STAGE.

IPIV2

• IPIV2 is INTEGER array, dimension (N) — details of the interchanges as computed by ZHETRF_AA_2STAGE.

B

• B is COMPLEX*16 array, dimension (LDB,NRHS).
  • On entry, the right hand side matrix B.
  • On exit, the solution matrix X. 🌸

LDB

• LDB is INTEGER — the leading dimension of the array B. LDB >= max(1,N).

INFO

• INFO is INTEGER.
  • = 0: successful exit. 🎉
  • < 0: if INFO = -i, the i-th argument had an illegal value.

Argument check tea: if INFO comes back negative, that means an argument was illegal — not a cute look, but at least the page tells you exactly which one by its i index. 💀

💖 Author 💖

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

Definition at line 139 of file zhetrs_aa_2stage.f.

🌸 Author 🌸

Generated automatically by Doxygen for LAPACK from the source code.

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Cute sign-off bestie: this page's footer stamps it with LAPACK Version 3.12.0 and points back to /home/abui...aa_2stage.f(3). That's the source/version energy at the very end — now go solve that system! 🫶💜