ffsim.contract.one_body_linop¶ ffsim.contract.one_body_linop(mat, norb, nelec)[source]¶ Convert a one-body tensor to a linear operator. A one-body tensor has the form \[\sum_{ij} M_{ij} a^\dagger_i a_j\] where \(M\) is a complex-valued matrix. Parameters: mat (ndarray) – The one-body tensor. norb (int) – The number of spatial orbitals. nelec (tuple[int, int]) – The number of alpha and beta electrons. Return type: LinearOperator Returns: A LinearOperator that implements the action of the one-body tensor.