BLAS/SRC/dscal.f(3)

📦
version 3.12.1 · 4 versions
, in arch rolling

🦋 BLAS/SRC/dscal.f(3) — Library Functions Manual 🦋

okay so bestie, we're in the BLAS corner of the LAPACK universe today — this is the manual page for dscal.f, from the Library Functions Manual. buckle up, it's short and it SLAPS 💅

✨ NAME ✨

BLAS/SRC/dscal.f — that's the whole name, no cap, that's literally it 🎀

🌸 SYNOPSIS 🌸

Functions/Subroutines

  • subroutine dscal (n, da, dx, incx) — the one and only, DSCAL herself 👑

💖 Function/Subroutine Documentation 💖

subroutine dscal (integer n, double precision da, double precision,
    dimension(*) dx, integer incx)

DSCAL — main character energy, fr fr ⭐

🧚 Purpose:

!>
!>    DSCAL scales a vector by a constant.
!>    uses unrolled loops for increment equal to 1.
!>

so basically: multiply a whole vector by one scalar. and when the increment is exactly 1, it flexes with unrolled loops 🔥 (iykyk)

🍓 Parameters

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

the count of how many elements are living in your input vector(s) ✨

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

the scalar itself, aka alpha. on entry, this is the number doing the scaling 💫

  • DX
!>          DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!>

your double precision array, sized exactly like that — ( 1 + ( N - 1 )*abs( INCX ) ) — copy it exactly bestie, don't be cute with the math 🙈

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

the storage spacing between elements of DX — how far apart your elements are chillin' in memory 🌈

👑 Author

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

the whole squad, we love a collab 🫶

💜 Further Details:

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

the lore 💀 — jack dongarra, linpack, dated 3/11/78, then tweaked 3/93 to bail out early if incx .le. 0, and tweaked again 12/3/93 when the array(1) declarations were changed to array(*). iconic history, ngl 🎀

📍 Definition at line 78 of file dscal.f.

🌟 Author (yes, a second one, she's extra)

Generated automatically by Doxygen for LAPACK from the source code. 🤖✨

heads up bestie: if incx is 0 or negative, per that 3/93 modification, the routine just returns — no scaling, no drama 💀

and that's the whole page!! LAPACK, Version 3.12.0, BLAS/SRC/dscal.f(3) — ty for reading my little manpage era, ily, go scale something 💖🎀🦋

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