code: def test_dlsim_5(self, xp, scp):
      # Retest the same with a 1-D input vector
      u = xp.hstack(
          (
              xp.linspace(0, 4.0, num=5)[:, None],
              xp.full((5, 1), 0.01),
              xp.full((5, 1), -0.002),
          )
      )
      t_in = xp.linspace(0, 2.0, num=5)
  
      # Transfer functions (assume dt = 0.5)
      num = xp.asarray([1.0, -0.1])
      den = xp.asarray([0.3, 1.0, 0.2])
  
      uflat = xp.asarray(u[:, 0])
      uflat = uflat.reshape((5,))
      tout, yout = scp.signal.dlsim((num, den, 0.5), uflat, t_in)
      return tout, yout
  
imports: from math import sqrt, pi
  from pytest import raises
  import cupy
  from cupy import testing
  import cupyx.scipy.signal
label_desc: Use image node_id 5 for calling the TestDLTI obj's underlying member method code with example usage: obj.test_dlsim_5(xp, scp) and returns: tout,  yout