diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /vendor/rand-0.7.3/examples/monte-carlo.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/rand-0.7.3/examples/monte-carlo.rs')
-rw-r--r-- | vendor/rand-0.7.3/examples/monte-carlo.rs | 51 |
1 files changed, 0 insertions, 51 deletions
diff --git a/vendor/rand-0.7.3/examples/monte-carlo.rs b/vendor/rand-0.7.3/examples/monte-carlo.rs deleted file mode 100644 index 70560d0fa..000000000 --- a/vendor/rand-0.7.3/examples/monte-carlo.rs +++ /dev/null @@ -1,51 +0,0 @@ -// Copyright 2018 Developers of the Rand project. -// Copyright 2013-2018 The Rust Project Developers. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -//! # Monte Carlo estimation of π -//! -//! Imagine that we have a square with sides of length 2 and a unit circle -//! (radius = 1), both centered at the origin. The areas are: -//! -//! ```text -//! area of circle = πr² = π * r * r = π -//! area of square = 2² = 4 -//! ``` -//! -//! The circle is entirely within the square, so if we sample many points -//! randomly from the square, roughly π / 4 of them should be inside the circle. -//! -//! We can use the above fact to estimate the value of π: pick many points in -//! the square at random, calculate the fraction that fall within the circle, -//! and multiply this fraction by 4. - -#![cfg(feature = "std")] - -use rand::distributions::{Distribution, Uniform}; - -fn main() { - let range = Uniform::new(-1.0f64, 1.0); - let mut rng = rand::thread_rng(); - - let total = 1_000_000; - let mut in_circle = 0; - - for _ in 0..total { - let a = range.sample(&mut rng); - let b = range.sample(&mut rng); - if a * a + b * b <= 1.0 { - in_circle += 1; - } - } - - // prints something close to 3.14159... - println!( - "π is approximately {}", - 4. * (in_circle as f64) / (total as f64) - ); -} |