laswp(3)

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version 3.12.1 · 9 versions
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💖 laswp(3) 💖

okay so bestie, welcome to the Library Functions Manual glow-up for laswp. This is the row-swap group chat: claswp, dlaswp, slaswp, and zlaswp, all doing their general rectangular matrix row-interchange thing. No cap, every detail is staying exactly where it was — only the vibe is getting main-character energy. ✨

🌸 NAME 🌸

laswp — laswp: swap permutation

✨ SYNOPSIS ✨

✨ Functions ✨

  • subroutine claswp (n, a, lda, k1, k2, ipiv, incx) — CLASWP performs a series of row interchanges on a general rectangular matrix.
  • subroutine dlaswp (n, a, lda, k1, k2, ipiv, incx) — DLASWP performs a series of row interchanges on a general rectangular matrix.
  • subroutine slaswp (n, a, lda, k1, k2, ipiv, incx) — SLASWP performs a series of row interchanges on a general rectangular matrix.
  • subroutine zlaswp (n, a, lda, k1, k2, ipiv, incx) — ZLASWP performs a series of row interchanges on a general rectangular matrix.

🌈 DETAILED DESCRIPTION 🌈

This is the detailed-description zone, and honestly it’s all about the function docs right below, bestie. No extra side quests here — the row-interchange lore lives in the four function entries. Periodt. 💅

👑 FUNCTION DOCUMENTATION 👑

Four functions, one row-swapping mission. The type of A is the little glow-up between them; the signature shape stays iconic. Let’s go. 🫶

🦋 claswp 🦋

subroutine claswp (integer n, complex, dimension( lda, * ) a, integer lda,
       integer k1, integer k2, integer, dimension( * ) ipiv, integer incx)

CLASWP performs a series of row interchanges on a general rectangular matrix.

💖 Purpose 💖

CLASWP performs a series of row interchanges on the matrix A. One row interchange is initiated for each of rows K1 through K2 of A.

🎀 Parameters 🎀

  • N — N is INTEGER. It’s the number of columns of the matrix A.
  • A — A is COMPLEX array, dimension (LDA,N). On entry, it’s the matrix of column dimension N to which the row interchanges will be applied. On exit, it’s the permuted matrix.
  • LDA — LDA is INTEGER. It’s the leading dimension of the array A.
  • K1 — K1 is INTEGER. It’s the first element of IPIV for which a row interchange will be done.
  • K2 — K2 is INTEGER. (K2-K1+1) is the number of elements of IPIV for which a row interchange will be done.
  • IPIV — IPIV is INTEGER array, dimension (K1+(K2-K1)*abs(INCX)). It’s the vector of pivot indices. Only the elements in positions K1 through K1+(K2-K1)*abs(INCX) of IPIV are accessed. IPIV(K1+(K-K1)*abs(INCX)) = L implies rows K and L are to be interchanged. iykyk 👀
  • INCX — INCX is INTEGER. It’s the increment between successive values of IPIV. If INCX is negative, the pivots are applied in reverse order.

🌟 Author 🌟

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

⭐ Further Details ⭐

Modified by R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA

Definition at line 114 of file claswp.f.

🦋 dlaswp 🦋

subroutine dlaswp (integer n, double precision, dimension( lda, * ) a,
       integer lda, integer k1, integer k2, integer, dimension( * ) ipiv,
       integer incx)

DLASWP performs a series of row interchanges on a general rectangular matrix.

💖 Purpose 💖

DLASWP performs a series of row interchanges on the matrix A. One row interchange is initiated for each of rows K1 through K2 of A.

🎀 Parameters 🎀

  • N — N is INTEGER. It’s the number of columns of the matrix A.
  • A — A is DOUBLE PRECISION array, dimension (LDA,N). On entry, it’s the matrix of column dimension N to which the row interchanges will be applied. On exit, it’s the permuted matrix.
  • LDA — LDA is INTEGER. It’s the leading dimension of the array A.
  • K1 — K1 is INTEGER. It’s the first element of IPIV for which a row interchange will be done.
  • K2 — K2 is INTEGER. (K2-K1+1) is the number of elements of IPIV for which a row interchange will be done.
  • IPIV — IPIV is INTEGER array, dimension (K1+(K2-K1)*abs(INCX)). It’s the vector of pivot indices. Only the elements in positions K1 through K1+(K2-K1)*abs(INCX) of IPIV are accessed. IPIV(K1+(K-K1)*abs(INCX)) = L implies rows K and L are to be interchanged.
  • INCX — INCX is INTEGER. It’s the increment between successive values of IPIV. If INCX is negative, the pivots are applied in reverse order.

🌟 Author 🌟

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

⭐ Further Details ⭐

Modified by R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA

Definition at line 114 of file dlaswp.f.

🦋 slaswp 🦋

subroutine slaswp (integer n, real, dimension( lda, * ) a, integer lda,
       integer k1, integer k2, integer, dimension( * ) ipiv, integer incx)

SLASWP performs a series of row interchanges on a general rectangular matrix.

💖 Purpose 💖

SLASWP performs a series of row interchanges on the matrix A. One row interchange is initiated for each of rows K1 through K2 of A.

🎀 Parameters 🎀

  • N — N is INTEGER. It’s the number of columns of the matrix A.
  • A — A is REAL array, dimension (LDA,N). On entry, it’s the matrix of column dimension N to which the row interchanges will be applied. On exit, it’s the permuted matrix.
  • LDA — LDA is INTEGER. It’s the leading dimension of the array A.
  • K1 — K1 is INTEGER. It’s the first element of IPIV for which a row interchange will be done.
  • K2 — K2 is INTEGER. (K2-K1+1) is the number of elements of IPIV for which a row interchange will be done.
  • IPIV — IPIV is INTEGER array, dimension (K1+(K2-K1)*abs(INCX)). It’s the vector of pivot indices. Only the elements in positions K1 through K1+(K2-K1)*abs(INCX) of IPIV are accessed. IPIV(K1+(K-K1)*abs(INCX)) = L implies rows K and L are to be interchanged.
  • INCX — INCX is INTEGER. It’s the increment between successive values of IPIV. If INCX is negative, the pivots are applied in reverse order.

🌟 Author 🌟

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

⭐ Further Details ⭐

Modified by R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA

Definition at line 114 of file slaswp.f.

🦋 zlaswp 🦋

subroutine zlaswp (integer n, complex*16, dimension( lda, * ) a, integer
       lda, integer k1, integer k2, integer, dimension( * ) ipiv, integer incx)

ZLASWP performs a series of row interchanges on a general rectangular matrix.

💖 Purpose 💖

ZLASWP performs a series of row interchanges on the matrix A. One row interchange is initiated for each of rows K1 through K2 of A.

🎀 Parameters 🎀

  • N — N is INTEGER. It’s the number of columns of the matrix A.
  • A — A is COMPLEX*16 array, dimension (LDA,N). On entry, it’s the matrix of column dimension N to which the row interchanges will be applied. On exit, it’s the permuted matrix.
  • LDA — LDA is INTEGER. It’s the leading dimension of the array A.
  • K1 — K1 is INTEGER. It’s the first element of IPIV for which a row interchange will be done.
  • K2 — K2 is INTEGER. (K2-K1+1) is the number of elements of IPIV for which a row interchange will be done.
  • IPIV — IPIV is INTEGER array, dimension (K1+(K2-K1)*abs(INCX)). It’s the vector of pivot indices. Only the elements in positions K1 through K1+(K2-K1)*abs(INCX) of IPIV are accessed. IPIV(K1+(K-K1)*abs(INCX)) = L implies rows K and L are to be interchanged.
  • INCX — INCX is INTEGER. It’s the increment between successive values of IPIV. If INCX is negative, the pivots are applied in reverse order.

🌟 Author 🌟

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

⭐ Further Details ⭐

Modified by R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA

Definition at line 114 of file zlaswp.f.

🌸 AUTHOR 🌸

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💖 footer sign-off: LAPACK Version 3.12.0 · laswp(3) — that’s the source/version stamp, and the only date-ish line on the page, bestie. mwah. 💅

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