SRC/zlauu2.f(3)

Okay bestie, welcome to the SRC/zlauu2.f(3) page from the Library Functions Manual 💖 This is the whole zlauu2 situation, and it’s giving unblocked-algorithm main character energy, no cap.

🌸 NAME 🌸

SRC/zlauu2.f — literally the file/page name, periodt ✨

✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

• subroutine zlauu2 (uplo, n, a, lda, info) — ZLAUU2 computes the product UUH or LHL, where U and L are upper or lower triangular matrices (unblocked algorithm). Slay.

💖 Function/Subroutine Documentation 💖

Here’s the full signature, bestie — copying it exactly because we don’t play about literals:

subroutine zlauu2 (character uplo, integer n, complex*16, dimension( lda, *
     ) a, integer lda, integer info)

ZLAUU2 computes the product UUH or LHL, where U and L are upper or lower triangular matrices (unblocked algorithm). Iconic.

🦋 Purpose 🦋

Okay so, the purpose is literally this: ZLAUU2 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. Highkey important.

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

This is the unblocked form of the algorithm, calling Level 2 BLAS. That’s the vibe.

🍓 Parameters 🍓

• UPLO — 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 — N is INTEGER. The order of the triangular factor U or L. N >= 0.
• A — A is COMPLEX*16 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 — LDA is INTEGER. The leading dimension of the array A. LDA >= max(1,N).
• INFO — 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 zlauu2.f.

🧚 Author 🧚

Generated automatically by Doxygen for LAPACK from the source code.

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That’s the whole page, bestie! 💅 This came from LAPACK, version 3.12.0, and the source is SRC/zlauu2.f(3). Byeee 🫶✨