SRC/dsytrs.f(3)

💖 NAME — SRC/dsytrs.f 💖

okay so this page is from the Library Functions Manual, and its title is SRC/dsytrs.f(3) — we're talking about SRC/dsytrs.f, bestie. 💅

✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

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

DSYTRS — that's the one. 👑

🦋 Function/Subroutine Documentation 🦋

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)

DSYTRS

🌸 Purpose 🌸

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. no cap, that's the whole purpose. ✨

💜 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*D*U**T;
  • = 'L': Lower triangular, form is A = L*D*L**T.
• 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 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 — LDA is INTEGER. The leading dimension of the array A. LDA >= max(1,N).
• IPIV — IPIV is INTEGER array, dimension (N). Details of the interchanges and the block structure of D as determined by DSYTRF.
• B — B is DOUBLE PRECISION 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

👑 Author 👑

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

Definition at line 119 of file dsytrs.f.

🪄 Author 🪄

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That's the whole page, bestie! 🫶 LAPACK, Version 3.12.0, SRC/dsytrs.f(3). Periodt. 💖