ffsim.spinful_to_spinless_vec

ffsim.spinful_to_spinless_vec(vec, norb, nelec)

Convert a spinful state vector to a spinless state vector.

Parameters:

• vec (ndarray) – The state vector in spinful format.

• norb (int) – The number of spatial orbitals.

• nelec (tuple[int, int]) – The numbers of spin alpha and spin beta electrons.

Return type:

ndarray

Returns:

The state vector in spinless format, with norb = norb and nocc = sum(nelec).