CLAUU2(3)

📦 version 3.12.0, in opensuse-leap 16.0

💅 CLAUU2(3) 💅 — Library Functions Manual energy

okay so bestie, this one is from the Library Functions Manual, and it’s giving “LAPACK triangular factor glow-up.” Not me being obsessed with an unblocked algorithm, but here we are. No cap: CLAUU2 is all about computing a product from an upper or lower triangular matrix, and she is lowkey iconic. 🦋

🎀 NAME 🎀

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/clauu2.f

✨ SYNOPSIS ✨

🦋 Functions/Subroutines 🦋

  • subroutine CLAUU2 (uplo, n, a, lda, info) — CLAUU2 computes the product UUH or LHL, where U and L are upper or lower triangular matrices (unblocked algorithm). 💖

💖 Function/Subroutine Documentation 💖

subroutine CLAUU2 (character uplo, integer n, complex, dimension( lda, * )
       a, integer lda, integer info)

CLAUU2 computes the product UUH or LHL, where U and L are upper or lower triangular matrices (unblocked algorithm). periodt. 💅

🌸 Purpose 🌸

CLAUU2 computes the product U * U**H or L**H * L, where the triangular factor U or L is stored in the upper or lower triangular part of the array A.

If UPLO = 'U' or 'u', then the upper triangle of the result is stored, overwriting the factor U in A.

If UPLO = 'L' or 'l', then the lower triangle of the result is stored, overwriting the factor L in A.

This is the unblocked form of the algorithm, calling Level 2 BLAS. iykyk ✨

💜 Parameters 💜

  • UPLO — is CHARACTER*1. Specifies whether the triangular factor stored in the array A is upper or lower triangular:
    • = 'U': Upper triangular
    • = 'L': Lower triangular
  • N — is INTEGER. The order of the triangular factor U or L. N >= 0.
  • A — is COMPLEX array, dimension (LDA,N). On entry, the triangular factor U or L. On exit, if UPLO = 'U', the upper triangle of A is overwritten with the upper triangle of the product U * U**H; if UPLO = 'L', the lower triangle of A is overwritten with the lower triangle of the product L**H * L.
  • LDA — is INTEGER. The leading dimension of the array A. LDA >= max(1,N).
  • INFO — is INTEGER:
    • = 0: successful exit
    • < 0: if INFO = -k, the k-th argument had an illegal value

👑 Author 👑

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

Definition at line 101 of file clauu2.f.

🌈 Author 🌈

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cute little sign-off, bestie: this page is LAPACK, Version 3.12.0, and the footer path is /home/abui...RC/clauu2.f(3). Slay, bye. 🫶💖
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