DSYTRS(3)

💖 DSYTRS(3) 💖

okay bestie, welcome to the Library Functions Manual side of the group chat. This page is all about the Fortran subroutine DSYTRS, and ngl it's giving linear-algebra main character energy. 🫶

🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/dsytrs.f

✨ SYNOPSIS ✨

Functions/Subroutines

subroutine DSYTRS (uplo, n, nrhs, a, lda, ipiv, b, ldb, info)
    DSYTRS

🦋 Function/Subroutine Documentation 🦋

Here's the full signature, bestie — copy it exactly, no improvising:

subroutine DSYTRS (character uplo, integer n, integer nrhs, double
     precision, dimension( lda, * ) a, integer lda, integer, dimension( * )
     ipiv, double precision, dimension( ldb, * ) b, integer ldb, integer
     info)

And yes, the routine is literally called DSYTRS — we been knew. 💅

Purpose 🎀

Bestie, DSYTRS solves a system of linear equations A*X = B with a real symmetric matrix A using the factorization A = U*D*U**T or A = L*D*L**T computed by DSYTRF. That's the whole vibe. ✨

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*D*U**T; = 'L': lower triangular, form is A = L*D*L**T.
• N — INTEGER. The order of the matrix A. N >= 0.
• NRHS — INTEGER. The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0.
• A — DOUBLE PRECISION array, dimension (LDA,N). The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by DSYTRF.
• LDA — INTEGER. The leading dimension of the array A. LDA >= max(1,N).
• IPIV — INTEGER array, dimension (N). Details of the interchanges and the block structure of D as determined by DSYTRF.
• 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. 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 at line 119 of file dsytrs.f.

Author 🫶

Generated automatically by Doxygen for LAPACK from the source code.

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signing off with the footer tea: this page is from LAPACK, Version 3.12.0, and the page path is /home/abui...RC/dsytrs.f(3). The footer doesn't show a date, so I'm not inventing one — periodt. 💜