BLAS/SRC/ddot.f(3)

📦
version 3.12.0 · 7 versions
, in centos-stream 10, fedora 43, fedora 44

💖 BLAS/SRC/ddot.f — bestie edition 💖

okay so this is ddot, straight out of the LAPACK BLAS crew, and it lives at BLAS/SRC/ddot.f. it is, and I cannot stress this enough, that girl — the dot product queen herself. 👑

✨ NAME ✨

BLAS/SRC/ddot.f — like, that's literally her whole name, no notes. 💅

🌸 SYNOPSIS 🌸

Functions/Subroutines

  • double precision function ddot (n, dx, incx, dy, incy) — DDOT, the icon herself 🫶

💫 Function/Subroutine Documentation 💫

double precision function ddot (integer n, double precision, dimension(*) dx, integer incx, double precision, dimension(*) dy, integer incy)

DDOT 🎀

🦋 Purpose

DDOT forms the dot product of two vectors.

and bestie, it uses unrolled loops for increments equal to one — she's optimizing, she's thriving, she's doing the absolute most so you don't have to. ✨

🌈 Parameters

  • N — N is INTEGER. it's the number of elements in the input vector(s). that's it, that's the count. 🔢
  • DX — DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) ). yes the dimension formula is that specific, don't @ me, INCX is out here changing the whole geometry of the situation. 🦋
  • INCX — INCX is INTEGER. it's the storage spacing between elements of DX. lil steps, big steps, her choice. 🚶♀️
  • DY — DY is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCY ) ). same energy as DX but make it the other vector. ✨
  • INCY — INCY is INTEGER. storage spacing between elements of DY. matching stride, matching vibe. 💅

👑 Author

  • Univ. of Tennessee
  • Univ. of California Berkeley
  • Univ. of Colorado Denver
  • NAG Ltd.
the whole squad gets credit, periodt. 🫶

💜 Further Details

jack dongarra, linpack, 3/11/78.
modified 12/3/93, array(1) declarations changed to array(*)
the way this code has been around since 3/11/78 and got a glow-up on 12/3/93 where the array(1) declarations became array(*) — character development, honestly. 😭

⭐ Definition at line 81 of file ddot.f.

🎀 Author 🎀

Generated automatically by Doxygen for LAPACK from the source code. not me getting documented by a robot, but honestly she ate. 🤖✨

okay bestie that's the whole page, we did it, no cap 💖 and just so you know who to thank when you cite this: Version 3.12.0, dated Tue Nov 28 2023 12:08:41, from BLAS/SRC/ddot.f(3) — go forth and dot product, my love 🌸🦋👑

📦 where this page comes from