Function noncommon_inds 

pub fn noncommon_inds<I: IndexLike>(indices_a: &[I], indices_b: &[I]) -> Vec<I>

Find indices that are not common between two collections (symmetric difference).

Returns indices that appear in either indices_a or indices_b but not in both (matched by ID). This corresponds to ITensors.jl’s noncommoninds function.

Time complexity: O(n + m) where n = len(indices_a), m = len(indices_b).

Arguments

• indices_a - First collection of indices
• indices_b - Second collection of indices

Returns

A vector containing indices from both collections that are not common to both. Order: indices from A first (in original order), then indices from B (in original order).

Example

use tensor4all_core::index::{DefaultIndex as Index, DynId};
use tensor4all_core::index_ops::noncommon_inds;

let i = Index::new_dyn(2);
let j = Index::new_dyn(3);
let k = Index::new_dyn(4);

let indices_a = vec![i.clone(), j.clone()];
let indices_b = vec![j.clone(), k.clone()];

let noncommon = noncommon_inds(&indices_a, &indices_b);
assert_eq!(noncommon.len(), 2);  // i and k