SRC/zdrscl.f(3)

💅 SRC/zdrscl.f(3) 💅

okay so bestie, this page is from the Library Functions Manual and it's all about a Fortran subroutine that's lowkey a math icon. No cap, it does one job and does it cute: multiply a vector by the reciprocal of a real scalar. The subroutine is zdrscl, and yes, the file is literally SRC/zdrscl.f. Periodt. ✨

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🎀 NAME 🎀

SRC/zdrscl.f — home of zdrscl, the subroutine whose whole vibe is ZDRSCL multiplies a vector by the reciprocal of a real scalar. 💖

🌈 SYNOPSIS 🌈

🌸 Functions/Subroutines 🌸

• subroutine zdrscl (n, sa, sx, incx) — ZDRSCL multiplies a vector by the reciprocal of a real scalar. 💫

🦋 Function/Subroutine Documentation 🦋

subroutine zdrscl (integer n, double precision sa, complex*16, dimension( *
       ) sx, integer incx)

ZDRSCL multiplies a vector by the reciprocal of a real scalar. That's the whole main-character energy of this routine, and honestly? Obsessed. 🫶

✨ Purpose ✨

From the source comments, bestie:

!>
!> ZDRSCL multiplies an n-element complex vector x by the real scalar
!> 1/a.  This is done without overflow or underflow as long as
!> the final result x/a does not overflow or underflow.
!>

So the tea is: it multiplies an n-element complex vector x by the real scalar 1/a, and it's built to dodge overflow and underflow — as long as the final result x/a does not overflow or underflow. That caveat is doing important work, so don't ignore it. 💀✨

🧚 Parameters 🧚

• N — N is INTEGER. It's the number of components of the vector x. Basically the headcount of the vector. 💅
• SA — SA is DOUBLE PRECISION. It's the scalar a which is used to divide each component of x. SA must be >= 0, or the subroutine will divide by zero. Ma'am, that is a real warning, not a drill. 😭
• SX — SX is a COMPLEX*16 array, dimension (1+(N-1)*abs(INCX)). It's the n-element vector x. The exact dimension is right there, so keep it cute and keep it correct. 🎀
• INCX — INCX is INTEGER. It's the increment between successive values of the vector SX. For the > 0 case, the source says:

> 0:  SX(1) = X(1) and SX(1+(i-1)*INCX) = x(i),     1< i<= n

That's the indexing map, and yes, the spacing and symbols matter. iykyk. 🌟

👑 Author 👑

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

These are the credited authors. Respect the whole squad. 🫡💖

Definition at line 83 of file zdrscl.f.

👑 Author 👑

Generated automatically by Doxygen for LAPACK from the source code.

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okay bestie, that's the whole page. Cute sign-off: LAPACK Version 3.12.0, source file SRC/zdrscl.f(3) — that's the footer energy, and we're honoring it with a little sparkle. 💖✨🦋