SRC/ssyconv.f(3)

📦
version 3.12.1 · 4 versions
, in arch rolling

💅 NAME 💅

SRC/ssyconv.f is the name, bestie, and the page header you'd normally see is SRC/ssyconv.f(3) from the Library Functions Manual. It's giving very specific linear-algebra icon behavior, and we're obsessed. ✨

🌸 SYNOPSIS 🌸

🫶 Functions/Subroutines 🫶

subroutine ssyconv (uplo, way, n, a, lda, ipiv, e, info)
    SSYCONV

🦋 Function/Subroutine Documentation 🦋

subroutine ssyconv (character uplo, character way, integer n, real,
     dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, real,
     dimension( * ) e, integer info)
    SSYCONV

✨ Purpose ✨

okay so the assignment is literally this: SSYCONV convert A given by TRF into L and D and vice-versa. It also does the Get Non-diag elements of D thing, with those elements returned in workspace, and it applies or reverses the permutation done in TRF. 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. = 'U': Upper triangular, form is A = U*D*U**T; = 'L': Lower triangular, form is A = L*D*L**T. 💖
  • WAY — CHARACTER*1; = 'C': Convert; = 'R': Revert. Simple as that, no cap. 🦋
  • N — INTEGER; the order of the matrix A. N >= 0. 🌸
  • A — 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 — 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 SSYTRF. 🔥
  • E — REAL array, dimension (N); E stores the supdiagonal/subdiagonal of the symmetric 1-by-1 or 2-by-2 block diagonal matrix D in LDLT. 💜
  • 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 113 of file ssyconv.f. 📌

⭐ Author ⭐

Generated automatically by Doxygen for LAPACK from the source code. 🤖✨

sign-off tea, bestie: this one's from LAPACK, Version 3.12.0, page SRC/ssyconv.f(3) — no extra date tea in the original, just the version/source moment. byeeee 💖🎀

📦 where this page comes from