Function sample_sphere_surface 

pub fn sample_sphere_surface(
    dim: usize,
    n: usize,
    radius: f64,
    positive: bool,
) -> Result<Vec<Vec<f64>>>

Samples n points uniformly from the surface of the dim-dimensional sphere of the given radius, centered at the origin, using the thread’s default random number generator.

With positive set, the points are restricted to the positive orthant (all coordinates non-negative). Each returned point has dim coordinates and Euclidean norm radius. With positive and radius <= 1 they are valid latent positions for Graph::dot_product_game (put them in the columns of its matrix).

Binds igraph_rng_sample_sphere_surface. Time complexity: O(n · dim).

Errors

ErrorKind::InvalidValue if dim < 2, or radius is not positive and finite.

Examples

use igraph::{misc, prelude::*};

rng::seed(42)?;
for p in misc::sample_sphere_surface(3, 10, 2.0, true)? {
    let norm = p.iter().map(|x| x * x).sum::<f64>().sqrt();
    assert!((norm - 2.0).abs() < 1e-9);
    assert!(p.iter().all(|&x| x >= 0.0));
}