DAXPY(3)

DAXPY(3) 💖

okay so this is the DAXPY(3) page from the Library Functions Manual, and bestie, we are officially in the BLAS group chat now. no cap, this routine is a whole little icon: it computes a constant times a vector plus a vector, and it uses unrolled loops for increments equal to one. periodt. 💅

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🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/BLAS/SRC/daxpy.f

that’s the whole main-character file path, exactly as the page gives it. 🎀

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✨ SYNOPSIS ✨

Functions/Subroutines

• subroutine DAXPY (n, da, dx, incx, dy, incy) — DAXPY. she’s showing up with her six arguments like she owns the place. 👑

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💫 Function/Subroutine Documentation 💫

the full signature is literally this:

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

DAXPY.

🎯 Purpose 🎯

here’s the exact source-comment energy:

!>
!>    DAXPY constant times a vector plus a vector.
!>    uses unrolled loops for increments equal to one.
!>

so yeah: constant times a vector plus a vector, and when increments are equal to one it uses unrolled loops. lowkey iconic. 🔥

🧸 Parameters 🧸

• N — N is INTEGER; number of elements in input vector(s). 🍓
• DA — DA is DOUBLE PRECISION; On entry, DA specifies the scalar alpha. 💖
• DX — DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) ). obsessed with the exact dimension string, bestie — don’t touch it. 🦋
• INCX — INCX is INTEGER; storage spacing between elements of DX. 🌸
• DY — DY is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCY ) ). again, exact dimension, no edits 🙈. 🎀
• INCY — INCY is INTEGER; storage spacing between elements of DY. ✨

👑 Author 👑

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

all four, exactly as listed. 🫶

🌈 Further Details 🌈

the further-details block is giving old-school Fortran receipts:

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

so we keep jack dongarra, linpack, 3/11/78, modified 12/3/93, and array(1) declarations changed to array(*). not me memorizing the lore. 💀

Definition at line 88 of file daxpy.f.

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🖨️ Author (Doxygen-generated) 🖨️

Generated automatically by Doxygen for LAPACK from the source code.

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and that’s the whole page, bestie. the footer sign-off is LAPACK Version 3.12.0 from /home/abui...SRC/daxpy.f(3) (no date listed on this footer) — mwah 💋🧚