DSYSWAPR(3)

💅 NAME 💅

Okay so this is the dsyswapr(3) page from the Library Functions Manual — header-title energy, but folded in all cute so we don't copy the whole line. The file it's repping is:

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

✨ SYNOPSIS ✨

Functions/Subroutines

• subroutine DSYSWAPR (uplo, n, a, lda, i1, i2) — bestie, this is the moment: DSYSWAPR applies an elementary permutation on the rows and columns of a symmetric matrix.

🦋 Function/Subroutine Documentation 🦋

Full signature, character-for-character:

subroutine DSYSWAPR (character uplo, integer n, double precision, dimension(
     lda, * ) a, integer lda, integer i1, integer i2)

DSYSWAPR applies an elementary permutation on the rows and columns of a symmetric matrix.

🎀 Purpose 🎀

DSYSWAPR applies an elementary permutation on the rows and the columns of a symmetric matrix.

🌸 Parameters 🌸

• UPLO — UPLO is CHARACTER*1. It says 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.
• A — A is DOUBLE PRECISION array, dimension (LDA,*). On entry, it's the N-by-N matrix A. On exit, it's the permuted matrix where the rows I1 and I2 and the columns I1 and I2 are interchanged. If UPLO = 'U', the interchanges are applied to the upper triangular part, and the strictly lower triangular part of A is not referenced; if UPLO = 'L', the interchanges are applied to the lower triangular part, and the part of A above the diagonal is not referenced.
• LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= max(1,N).
• I1 — I1 is INTEGER. Index of the first row to swap.
• I2 — I2 is INTEGER. Index of the second row to swap.

👑 Author 👑

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

Definition at line 99 of file dsyswapr.f.

🌈 Author 🌈

Generated automatically by Doxygen for LAPACK from the source code.

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Final sign-off, bestie: the footer source/version/date corner says LAPACK, Version 3.12.0, and /home/abui.../dsyswapr.f(3) — that's the whole stamp as printed. Slay, and keep the facts intact. 💖✨