SRC/zsytrs_aa_2stage.f(3)

🌸 NAME 🌸

Bestie, welcome to the Library Functions Manual page for SRC/zsytrs_aa_2stage.f 💖 — this is where the subroutine zsytrs_aa_2stage lives, and she is ready to solve.

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✨ SYNOPSIS ✨

Under Functions/Subroutines, the icon herself is:

subroutine zsytrs_aa_2stage (uplo, n, nrhs, a, lda, tb, ltb, ipiv,
    ipiv2, b, ldb, info)

Also: ZSYTRS_AA_2STAGE.

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💅 Function/Subroutine Documentation 💅

Okay so here’s the full signature, copied exactly because we do not play fast and loose with argument lists:

subroutine zsytrs_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)

ZSYTRS_AA_2STAGE.

🎯 Purpose

ZSYTRS_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 ZSYTRF_AA_2STAGE. Slay, honestly.

🧚 Parameters

• UPLO — UPLO is CHARACTER*1. Tells us whether the factorization details are stored as an upper or lower triangular matrix. The options are:
  • = 'U': Upper triangular, form is A = U**T*T*U;
  • = 'L': Lower triangular, form is A = L*T*L**T.
• N — N is INTEGER. The order of the matrix A. Constraint: N >= 0.
• NRHS — NRHS is INTEGER. The number of right hand sides, i.e., the number of columns of the matrix B. Constraint: NRHS >= 0.
• A — A is COMPLEX*16 array, dimension (LDA,N). Contains details of factors computed by ZSYTRF_AA_2STAGE.
• LDA — LDA is INTEGER. The leading dimension of the array A. Constraint: LDA >= max(1,N).
• TB — TB is COMPLEX*16 array, dimension (LTB). Contains details of factors computed by ZSYTRF_AA_2STAGE.
• LTB — LTB is INTEGER. The size of the array TB. Constraint: LTB >= 4*N.
• IPIV — IPIV is INTEGER array, dimension (N). Contains details of the interchanges as computed by ZSYTRF_AA_2STAGE.
• IPIV2 — IPIV2 is INTEGER array, dimension (N). Contains details of the interchanges as computed by ZSYTRF_AA_2STAGE.
• B — B is COMPLEX*16 array, dimension (LDB,NRHS). On entry, this is the right hand side matrix B. On exit, it’s the solution matrix X. Character development fr fr.
• LDB — LDB is INTEGER. The leading dimension of the array B. Constraint: LDB >= max(1,N).
• INFO — INFO is INTEGER. Exit status tea:
  • = 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 at line 137 of file zsytrs_aa_2stage.f.

👑 Author 👑

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