Function clark_evans_index 

pub fn clark_evans_index<T: Float>(
    coordinates: &ArrayView2<'_, T>,
    study_area: T,
) -> SpatialResult<T>

Calculate Clark-Evans nearest neighbor index

The Clark-Evans index compares the average nearest neighbor distance to the expected distance in a random point pattern. Values < 1 indicate clustering, values > 1 indicate regularity, and values ≈ 1 indicate randomness.

Arguments

• coordinates - Array of coordinate pairs [x, y] for each point
• study_area - Area of the study region

Returns

• Clark-Evans index (R)

Examples

use ndarray::array;
use scirs2_spatial::spatial_stats::clark_evans_index;

let coords = array![
    [0.0, 0.0],
    [1.0, 0.0],
    [0.0, 1.0],
    [1.0, 1.0],
];

let ce_index = clark_evans_index(&coords.view(), 4.0).unwrap();
println!("Clark-Evans index: {:.3}", ce_index);