Update timeresp.py

juanodecc · web-flow · commit 95ca297192e4 · 2021-03-24T20:20:51.000-03:00
diff --git a/control/timeresp.py b/control/timeresp.py
@@ -882,7 +882,6 @@ def step_info(sysdata, T=None, T_num=None, yfinal=None,
 
             # Steady state value
             InfValue = InfValues[i, j]
-            InfValue_sign = np.sign(InfValue)
             sgnInf = np.sign(InfValue.real)
 
             rise_time: float = np.NaN
@@ -925,9 +924,9 @@ def step_info(sysdata, T=None, T_num=None, yfinal=None,
                     overshoot = 0
 
                 # Undershoot 
-                y_us = (InfValue_sign*yout).min()
-                y_us_index = (InfValue_sign*yout).argmin()
-                if (InfValue_sign * yout[y_us_index]) < 0: # must have oposite sign
+                y_us = (sgnInf*yout).min()
+                y_us_index = (sgnInf*yout).argmin()
+                if (sgnInf * yout[y_us_index]) < 0: # must have oposite sign
                     undershoot = np.abs(100. * np.abs(y_us) / InfValue)
                 else:
                     undershoot = 0
