BLAS/SRC/daxpy.f(3)

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

✨ BLAS/SRC/daxpy.f ✨

okay bestie, gather round, because we're about to talk about the little routine that could: daxpy, straight out of the BLAS folder in LAPACK. no cap, this one's a classic. 🎀

🌸 SYNOPSIS 🌸

Functions/Subroutines

  • subroutine daxpy (n, da, dx, incx, dy, incy) — the whole vibe, in one line. it's giving DAXPY. 💅

💖 Function/Subroutine Documentation 💖

🦋 subroutine daxpy (integer n, double precision da, double precision, dimension(*) dx, integer incx, double precision, dimension(*) dy, integer incy)

DAXPY 👑

🎯 Purpose:

DAXPY does a constant times a vector plus a vector. literally the y = a·x + y moment of your dreams, and it uses unrolled loops for increments equal to one. yes ma'am, it's optimizing. 🔥

✨ Parameters ✨

  • N — N is INTEGER, the number of elements in the input vector(s). it's the count, the headcount, the how-many-besties-are-in-this-vector. 💜
  • DA — DA is DOUBLE PRECISION. on entry, DA specifies the scalar alpha. this is the constant, the multiplier, the main character of the whole operation. 👑
  • DX — DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) ). that's the input vector, x, and yes the dimension formula is exactly that, character for character, no notes. 🌸
  • INCX — INCX is INTEGER, the storage spacing between elements of DX. it's how far apart the x-besties are standing from each other. 🦋
  • DY — DY is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCY ) ). the other input vector, y, and the dimension formula stays exactly as written. ✨
  • INCY — INCY is INTEGER, the storage spacing between elements of DY. same deal as INCX, but for y. matching energy, fr fr. 💖

👑 Author

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

the whole squad. iconic. 🫶

🧚 Further Details:

jack dongarra, linpack, 3/11/78.
modified 12/3/93, array(1) declarations changed to array(*)

look at that history. 3/11/78?? the longevity. the legacy. and then a little glow-up on 12/3/93 where the array(1) declarations got changed to array(*). ate and left no crumbs. 💀

📌 Definition at line 88 of file daxpy.f. yes, line 88. go look. i'll wait. 🙈

🌈 Author (yes, again)

Generated automatically by Doxygen for LAPACK from the source code. not me being auto-generated and still serving looks. 🤖✨

Version 3.12.0 · Tue Nov 28 2023 12:08:41 · BLAS/SRC/daxpy.f(3)

and that's the whole page, bestie 💅 ty for coming to my ted talk, go multiply a scalar by a vector, slay, periodt. 🎀💖🦋

📦 where this page comes from