BLAS/SRC/zdscal.f(3)

📦
version 3.12.1 · 4 versions
, in arch rolling

💅 BLAS/SRC/zdscal.f

okay so bestie, welcome to the glow-up page for BLAS/SRC/zdscal.f — this is the LAPACK manual entry, and honestly? it's a whole vibe. it's a Fortran BLAS routine, it scales vectors, and it's been slaying since 1978. let's get into it ✨

🦋 SYNOPSIS 🦋

Functions/Subroutines

  • subroutine zdscal (n, da, zx, incx) — bestie this is the one, the main character, ZDSCAL herself 👑

🌸 Function/Subroutine Documentation 🌸

subroutine zdscal (integer n, double precision da, complex*16, dimension(*) zx, integer incx)

ZDSCAL — she's here, she's iconic, she does exactly one thing and does it flawlessly 🫶

✨ Purpose ✨

!> !> ZDSCAL scales a vector by a constant. !>

no cap, that's the whole assignment. a vector walks in, a constant gets applied, everybody leaves scaled. periodt 💅

🎀 Parameters 🎀

  • N
!> N is INTEGER !> number of elements in input vector(s) !>

lowkey the most important number here — it's literally how many elements are in your input vector(s) 🍓

  • DA
!> DA is DOUBLE PRECISION !> On entry, DA specifies the scalar alpha. !>

this is your scalar alpha, your double precision moment, the ~constant~ doing the scaling. she's giving main character energy 🌈

  • ZX
!> ZX is COMPLEX*16 array, dimension ( 1 + ( N - 1 )*abs( INCX ) ) !>

the vector itself, a COMPLEX*16 array. note that dimension formula — 1 + ( N - 1 )*abs( INCX ) — it's not just N, because spacing matters, iykyk 💜

  • INCX
!> INCX is INTEGER !> storage spacing between elements of ZX !>

the stride, bestie. the storage spacing between elements of ZX. skip along the array however you like 🦋

👑 Author 👑

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

the whole committee showed up for this one fr fr 🫶

⭐ Further Details ⭐

!> !> jack dongarra, 3/11/78. !> modified 3/93 to return if incx .le. 0. !> modified 12/3/93, array(1) declarations changed to array(*) !>

okay so tiny history lesson, because the lore is immaculate 📜: jack dongarra, 3/11/78. wrote the original — then modified 3/93 to return if incx .le. 0. (so if INCX .le. 0 she just returns, no drama, no crash) and then modified 12/3/93, array(1) declarations changed to array(*) which is the most 1993 glow-up imaginable 💀

🔥 Definition 🔥

Definition at line 77 of file zdscal.f.

line 77, bestie. remember it. not that you need to, but remember it 💖

🧚 Author 🧚

Generated automatically by Doxygen for LAPACK from the source code.

so nobody wrote this page by hand — Doxygen for LAPACK auto-generated it from the source code, and honestly it ate 🙈

and that's the page!! thanks for coming to my ted talk, go forth and scale those vectors, LAPACK Version 3.12.0, dated BLAS/SRC/zdscal.f(3) — mwah 💋🎀✨

📦 where this page comes from