diff --git a/control/statesp.py b/control/statesp.py
index 6b3a1dff3..ffd579247 100644
--- a/control/statesp.py
+++ b/control/statesp.py
@@ -921,6 +921,10 @@ def horner(self, x, warn_infinite=True):
out[:, :, idx] = complex(np.nan, np.nan)
else:
out[:, :, idx] = complex(np.inf, np.nan)
+ else:
+ if np.any(np.isnan(out[:, :, idx])):
+ print(idx, x_idx, self.A, self.B)
+ print(out[:, :, idx])
return out
diff --git a/control/tests/flatsys_test.py b/control/tests/flatsys_test.py
index 373af8dae..6f4ef7cef 100644
--- a/control/tests/flatsys_test.py
+++ b/control/tests/flatsys_test.py
@@ -339,8 +339,9 @@ def test_point_to_point_errors(self):
traj_kwarg = fs.point_to_point(
flat_sys, timepts, x0, u0, xf, uf, cost=cost_fcn,
basis=fs.PolyFamily(8), minimize_kwargs={'method': 'slsqp'})
- np.testing.assert_almost_equal(
- traj_method.eval(timepts)[0], traj_kwarg.eval(timepts)[0])
+ np.testing.assert_allclose(
+ traj_method.eval(timepts)[0], traj_kwarg.eval(timepts)[0],
+ atol=1e-5)
# Unrecognized keywords
with pytest.raises(TypeError, match="unrecognized keyword"):
diff --git a/control/tests/timeresp_test.py b/control/tests/timeresp_test.py
index c74c0c06d..d9cb065f6 100644
--- a/control/tests/timeresp_test.py
+++ b/control/tests/timeresp_test.py
@@ -681,7 +681,8 @@ def test_forced_response_T_U(self, tsystem, fr_kwargs, refattr):
fr_kwargs['X0'] = tsystem.X0
t, y = forced_response(tsystem.sys, **fr_kwargs)
np.testing.assert_allclose(t, tsystem.t)
- np.testing.assert_allclose(y, getattr(tsystem, refattr), rtol=1e-3)
+ np.testing.assert_allclose(y, getattr(tsystem, refattr),
+ rtol=1e-3, atol=1e-5)
@pytest.mark.parametrize("tsystem", ["siso_ss1"], indirect=True)
def test_forced_response_invalid_c(self, tsystem):
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