reduce_to_external

pmrf.models.composite.interconnected.circuit.solvers.scattering.reduce_to_external(C_i: Array, X: Array, N_act: int, eps: float, linear_solver: AbstractLinearSolver) → Array

Unified global reduction using the block Schur complement (Eq. 10). Bypasses padding probes by partitioning the system natively into internal and external boundaries.

S_reduced = X_ee + X_ei * C_i * (I - X_ii * C_i)^-1 * X_ie