The `create_statefbk_iosystem` sets the name of the closed loop system that it creates to one of the system inputs. For example: ``` import numpy as np import control as ct sys = ct.ss([[0, 10], [-1, 0]], [[0], [1]], np.eye(2), 0, name='sys') K, _, _ = ct.lqr(sys, np.eye(sys.nstates), np.eye(sys.ninputs)) ctrl, clsys = ct.create_statefbk_iosystem(sys, K) print(clsys) ``` gives ``` <LinearICSystem>: u[0] Inputs (3): ['xd[0]', 'xd[1]', 'ud[0]'] Outputs (3): ['y[0]', 'y[1]', 'u[0]'] States (2): ['sys_x[0]', 'sys_x[1]'] ``` which has the name of the system as `u[0]` instead of something like `sys[3]`.