Function unique_inds 

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

Find indices that are unique to the first collection (set difference A \ B).

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

Arguments

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

Returns

A vector containing indices from indices_a that are not in indices_b.

Example

use tensor4all_core::index::{DefaultIndex as Index, DynId};
use tensor4all_core::index_ops::unique_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 unique = unique_inds(&indices_a, &indices_b);
assert_eq!(unique.len(), 1);
assert_eq!(unique[0].id, i.id);