Template Function sequant::external_indices(const Expr&)

• Defined in File indices.hpp

Function Documentation

template<typename Container = container::svector<container::svector<Index>>>
Container sequant::external_indices(const Expr &expr)

Obtains the groups of external (named) indices for the given expression.

See also

get_bra_idx

See also

get_ket_idx

Note

The order of indices in index groups is unspecified and may change in the future. If you need to selectively obtain bra or ket indices, use get_bra_idx or get_ket_idx on the group.

Parameters:

expr – The expression to fetch the indices for

Returns:

A container of index groups