linear_operator¶

linear_operator(operator, norb, nelec)¶

Returns a scipy.sparse.linalg.LinearOperator for an operator on the (norb, nelec) FCI sector.

This is a thin, type-agnostic wrapper around the SupportsLinearOperator protocol method, mirroring the free-function style of ffsim.linear_operator().

Parameters:

operator (SupportsLinearOperator) – the operator to convert, implementing SupportsLinearOperator.
norb (int) – the number of spatial orbitals.
nelec (int | tuple[int, int]) – the electron count – an integer for a spinless sector, or an (n_alpha, n_beta) pair for a spinful one.

Returns:

A scipy.sparse.linalg.LinearOperator applying operator on the requested sector.

Return type:

LinearOperator