Function sample_sphere_surface 

pub fn sample_sphere_surface(
    dim: usize,
    n: usize,
    radius: f64,
    positive: bool,
    seed: u64,
) -> IgraphResult<Vec<Vec<f64>>>

Sample points uniformly from the surface of a sphere.

Generates n points uniformly distributed on the surface of a dim-dimensional sphere of the given radius, centered at the origin. Uses the Muller (1959) method: generate dim independent standard normals, normalize to unit length, then scale by radius.

If positive is true, all coordinates are mapped to their absolute values (restricting to the positive orthant).

Returns a Vec<Vec<f64>> where each inner Vec has dim elements.

Errors

Returns InvalidArgument if:

• dim < 2
• radius <= 0

Examples

use rust_igraph::sample_sphere_surface;

let points = sample_sphere_surface(3, 2, 1.0, false, 42).unwrap();
assert_eq!(points.len(), 2);
assert_eq!(points[0].len(), 3);
// Each point lies on the unit sphere
for p in &points {
    let r2: f64 = p.iter().map(|&x| x * x).sum();
    assert!((r2 - 1.0).abs() < 1e-10);
}