/// Computes the squared Euclidean distance between two array of equal length.
///
/// # Arguments
/// * `a`: A floating point array.
/// * `b`: A second floating point array.
///
/// # Returns
/// The squared Euclidean distance.
/// Computes the Euclidean distance between two array of equal length.
///
/// # Arguments
/// * `a`: A floating point array.
/// * `b`: A second floating point array.
///
/// # Returns
/// The Euclidean distance.