dnrm2.f(3)

🎀 dnrm2.f — LAPACK manual page (dnrm2.f(3)), bestie edition 🎀

okay so bestie, welcome to the LAPACK page for dnrm2.f. ngl, it's giving tiny file, main character math energy, and we're keeping literally every single crumb of the original — just with way more sparkle. Vibe check: immaculate. No cap. ✨💅

💖 NAME 💖

dnrm2.f — that's the name, periodt. Slay. 🫶

✨ SYNOPSIS ✨

Under Functions/Subroutines, the signature is exactly this cutie:

       double precision function dnrm2 (N, X, INCX)
           DNRM2

🌸 Function/Subroutine Documentation 🌸

Here's the full documented signature, verbatim because we respect the source code in this house:

   double precision function dnrm2 (integer N, double precision, dimension(*)
       X, integer INCX)
       DNRM2

🦋 Purpose 🦋

The way that DNRM2 returns the euclidean norm of a vector via the function name is lowkey iconic, so that

DNRM2 := sqrt( x'*x )

That's the whole point, and it ate — iykyk. Highkey obsessed with how clean this is. 💅

💅 Parameters 💅

• N — N is INTEGER; number of elements in input vector(s). That's the count, bestie. 🔢
• X — X is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) ). Yes, the whole dimensions situation is exactly that. 📏
• INCX — INCX is INTEGER; storage spacing between elements of DX. (Yep, the original says DX, not X — not me fixing it, just reporting it. 🙈)

fr fr, that DX detail is straight from the source page — no sneaky edits. 💀

👑 Author 👑

The author squad is:

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

🎀 Date 🎀

November 2017

🌈 Further Details 🌈

The extra tea, preserved exactly:

-- This version written on 25-October-1982.
   Modified on 14-October-1993 to inline the call to DLASSQ.
   Sven Hammarling, Nag Ltd.

And the definition location is:

Definition at line 76 of file dnrm2.f.

⭐ Author ⭐

The Author section says: Generated automatically by Doxygen for LAPACK from the source code. ✨

💖 cute sign-off: LAPACK Version 3.8.0, dated Tue Nov 14 2017, for dnrm2.f(3) — generated from the LAPACK source code, bye bestie! 💋💖