SRC/dsytrs_aa_2stage.f(3)

💅 SRC/dsytrs_aa_2stage.f(3) 💅

okay bestie, welcome to the Library Functions Manual page for SRC/dsytrs_aa_2stage.f(3) — yes, the filename is literally the title, and honestly? iconic. This is the LAPACK routine DSYTRS_AA_2STAGE, and it's here to solve linear systems after the factorization from DSYTRF_AA_2STAGE. no cap. ✨

🌸 NAME 🌸

SRC/dsytrs_aa_2stage.f — the source file for the dsytrs_aa_2stage subroutine, aka DSYTRS_AA_2STAGE, living its best LAPACK life. 🫶

🌈 SYNOPSIS 🌈

🫶 Functions/Subroutines 🫶

subroutine dsytrs_aa_2stage (uplo, n, nrhs, a, lda, tb, ltb, ipiv,
        ipiv2, b, ldb, info)
        DSYTRS_AA_2STAGE

🦋 Function/Subroutine Documentation 🦋

subroutine dsytrs_aa_2stage (character uplo, integer n, integer nrhs, double
       precision, dimension( lda, * ) a, integer lda, double precision,
       dimension( * ) tb, integer ltb, integer, dimension( * ) ipiv, integer,
       dimension( * ) ipiv2, double precision, dimension( ldb, * ) b, integer
       ldb, integer info)
       DSYTRS_AA_2STAGE

✨ Purpose ✨

DSYTRS_AA_2STAGE solves a system of linear equations A*X = B with a real symmetric matrix A using the factorization A = U**T*T*U or A = L*T*L**T computed by DSYTRF_AA_2STAGE. That's the whole main-character job. 💅

🎀 Parameters 🎀

• UPLO — CHARACTER*1. Specifies whether the details of the factorization are stored as an upper or lower triangular matrix. The values are = 'U': Upper triangular, form is A = U**T*T*U; and = 'L': Lower triangular, form is A = L*T*L**T. 🦋
• N — INTEGER. The order of the matrix A. Constraint: N >= 0.
• NRHS — INTEGER. The number of right hand sides, i.e., the number of columns of the matrix B. Constraint: NRHS >= 0.
• A — DOUBLE PRECISION array, dimension (LDA,N). Details of factors computed by DSYTRF_AA_2STAGE.
• LDA — INTEGER. The leading dimension of the array A. Constraint: LDA >= max(1,N).
• TB — DOUBLE PRECISION array, dimension (LTB). Details of factors computed by DSYTRF_AA_2STAGE.
• LTB — INTEGER. The size of the array TB. Constraint: LTB >= 4*N.
• IPIV — INTEGER array, dimension (N). Details of the interchanges as computed by DSYTRF_AA_2STAGE.
• IPIV2 — INTEGER array, dimension (N). Details of the interchanges as computed by DSYTRF_AA_2STAGE.
• B — DOUBLE PRECISION array, dimension (LDB,NRHS). On entry, the right hand side matrix B. On exit, the solution matrix X. 🎀
• LDB — INTEGER. The leading dimension of the array B. Constraint: LDB >= max(1,N).
• INFO — INTEGER. Exit status: = 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 dsytrs_aa_2stage.f.

👑 Author 👑

Generated automatically by Doxygen for LAPACK from the source code.

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okay bestie, that's the whole page 💖 the footer energy is LAPACK Version 3.12.0, from SRC/dsytrs_aa_2stage.f(3). go solve those symmetric systems and slay. 🎀✨