SRC/ssytrs.f(3)

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version 3.12.1 · 7 versions
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💖 SRC/ssytrs.f(3) 💖

okay bestie, welcome to the Library Functions Manual page for SRC/ssytrs.f — yes, the file name is right there in the NAME section too, we’re not hiding it. 🫶

✨ NAME ✨

SRC/ssytrs.f

🎀 SYNOPSIS 🎀

🌸 Functions/Subroutines 🌸

  • subroutine ssytrs (uplo, n, nrhs, a, lda, ipiv, b, ldb, info) — SSYTRS

🦋 Function/Subroutine Documentation 🦋

🧚 subroutine ssytrs — the full glow-up signature 🧚

subroutine ssytrs (character uplo, integer n, integer nrhs, real, dimension(
     lda, * ) a, integer lda, integer, dimension( * ) ipiv, real, dimension(
     ldb, * ) b, integer ldb, integer info)

SSYTRS — that’s the routine name, no cap. 💅

🌟 Purpose 🌟

SSYTRS 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 SSYTRF. literally the solve step after the factorization, bestie ✨

💅 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 REAL array, dimension (LDA,N). The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by SSYTRF.
  • 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 SSYTRF.
  • B — B is REAL 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 ssytrs.f.

🌈 Author 🌈

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Catch you later, bestie — this page is from LAPACK Version 3.12.0, file SRC/ssytrs.f(3). 💖✨

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