1 files changed, 0 insertions, 94 deletions
diff --git a/rand/rand_distr/src/unit_sphere.rs b/rand/rand_distr/src/unit_sphere.rs
deleted file mode 100644
index 8e0c361..0000000
--- a/rand/rand_distr/src/unit_sphere.rs
+++ /dev/null
@@ -1,94 +0,0 @@
-// Copyright 2018-2019 Developers of the Rand project.
-//
-// 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.
-
-use rand::Rng;
-use crate::{Distribution, Uniform, uniform::SampleUniform};
-use crate::utils::Float;
-
-/// Samples uniformly from the surface of the unit sphere in three dimensions.
-///
-/// Implemented via a method by Marsaglia[^1].
-///
-///
-/// # Example
-///
-/// ```
-/// use rand_distr::{UnitSphere, Distribution};
-///
-/// let v: [f64; 3] = UnitSphere.sample(&mut rand::thread_rng());
-/// println!("{:?} is from the unit sphere surface.", v)
-/// ```
-///
-/// [^1]: Marsaglia, George (1972). [*Choosing a Point from the Surface of a
-///       Sphere.*](https://doi.org/10.1214/aoms/1177692644)
-///       Ann. Math. Statist. 43, no. 2, 645--646.
-#[derive(Clone, Copy, Debug)]
-pub struct UnitSphere;
-
-impl<N: Float + SampleUniform> Distribution<[N; 3]> for UnitSphere {
-    #[inline]
-    fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> [N; 3] {
-        let uniform = Uniform::new(N::from(-1.), N::from(1.));
-        loop {
-            let (x1, x2) = (uniform.sample(rng), uniform.sample(rng));
-            let sum = x1*x1 + x2*x2;
-            if sum >= N::from(1.) {
-                continue;
-            }
-            let factor = N::from(2.) * (N::from(1.0) - sum).sqrt();
-            return [x1 * factor, x2 * factor, N::from(1.) - N::from(2.)*sum];
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::Distribution;
-    use super::UnitSphere;
-
-    /// Assert that two numbers are almost equal to each other.
-    ///
-    /// On panic, this macro will print the values of the expressions with their
-    /// debug representations.
-    macro_rules! assert_almost_eq {
-        ($a:expr, $b:expr, $prec:expr) => (
-            let diff = ($a - $b).abs();
-            if diff > $prec {
-                panic!(format!(
-                    "assertion failed: `abs(left - right) = {:.1e} < {:e}`, \
-                     (left: `{}`, right: `{}`)",
-                    diff, $prec, $a, $b));
-            }
-        );
-    }
-
-    #[test]
-    fn norm() {
-        let mut rng = crate::test::rng(1);
-        for _ in 0..1000 {
-            let x: [f64; 3] = UnitSphere.sample(&mut rng);
-            assert_almost_eq!(x[0]*x[0] + x[1]*x[1] + x[2]*x[2], 1., 1e-15);
-        }
-    }
-
-    #[test]
-    fn value_stability() {
-        let mut rng = crate::test::rng(2);
-        let expected = [
-                [0.03247542860231647, -0.7830477442152738, 0.6211131755296027],
-                [-0.09978440840914075, 0.9706650829833128, -0.21875184231323952],
-                [0.2735582468624679, 0.9435374242279655, -0.1868234852870203],
-            ];
-        let samples: [[f64; 3]; 3] = [
-                UnitSphere.sample(&mut rng),
-                UnitSphere.sample(&mut rng),
-                UnitSphere.sample(&mut rng),
-            ];
-        assert_eq!(samples, expected);
-    }
-}