TESTING/MATGEN/dlaran.f(3)

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version 3.12.1 · 3 versions
, in arch rolling

💖 TESTING/MATGEN/dlaran.f(3) 💖

Okay bestie, welcome to the TESTING/MATGEN/dlaran.f(3) page — it's chilling in the Library Functions Manual, and it's all about DLARAN, a tiny icon that gives you random real numbers. ✨

🌸 NAME 🌸

TESTING/MATGEN/dlaran.f — home of DLARAN, the random-number function we're obsessing over today. 💅

🦋 SYNOPSIS 🦋

Functions/Subroutines

  • double precision function dlaran (iseed) — that's DLARAN, periodt.

🎀 Function/Subroutine Documentation 🎀

Here's the whole function vibe:

double precision function dlaran (integer, dimension( 4 ) iseed)

DLARAN

✨ Purpose ✨

DLARAN returns a random real number from a uniform (0,1) distribution. That's the whole purpose, and it ate. 🫶

🌈 Parameters 🌈

ISEED

ISEED is INTEGER array, dimension (4).

On entry, it's the seed of the random number generator; the array elements must be between 0 and 4095, and ISEED(4) must be odd. No cap, that odd rule is real. 🫶

On exit, the seed is updated. Slay. 💫

👑 Author 👑

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

🔥 Further Details 🔥

This routine uses a multiplicative congruential method with modulus 2**48 and multiplier 33952834046453 (see G.S.Fishman, 'Multiplicative congruential random number generators with modulus 2**b: an exhaustive analysis for b = 32 and a partial analysis for b = 48', Math. Comp. 189, pp 331-344, 1990). 🧚

48-bit integers are stored in 4 integer array elements with 12 bits per element. Hence the routine is portable across machines with integers of 32 bits or more. Lowkey iconic portability behavior. 💜

Definition at line 66 of file dlaran.f.

⭐ Author ⭐

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💖 That's the whole page, bestie — source/version: LAPACK Version 3.12.0, and the page is TESTING/MATGEN/dlaran.f(3). Mwah! 💖

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