unify docstring for return ScipySignalLTI

bnavigator · bnavigator · commit a3336a4a495c · 2020-08-04T11:11:17.000+02:00
diff --git a/control/statesp.py b/control/statesp.py
@@ -801,15 +801,17 @@ def returnScipySignalLTI(self, strict=True):
         ----------
         strict : bool, optional
             True (default):
-              `ssobject` must be continuous or discrete. `tfobject.dt` cannot
-              be None.
+                The timebase `ssobject.dt` cannot be None; it must
+                be continuous (0) or discrete (True or > 0).
             False:
-              if `ssobject.dt` is None, continuous time signal.StateSpace
-              objects are returned
+              If `ssobject.dt` is None, continuous time scipy.signal.lti
+              objects are returned.
 
         Returns
         -------
         out : list of list of scipy.signal.StateSpace
+            continuous time (inheriting from scipy.signal.lti)
+            or discrete time (inheriting from scipy.signal.dlti) SISO objects
         """
         if strict and self.dt is None:
             raise ValueError("with strict=True, dt cannot be None")
diff --git a/control/xferfcn.py b/control/xferfcn.py
@@ -803,7 +803,7 @@ def minreal(self, tol=None):
         return TransferFunction(num, den, self.dt)
 
     def returnScipySignalLTI(self, strict=True):
-        """Return a list of a list of scipy.signal.lti objects.
+        """Return a list of a list of SISO scipy.signal.lti objects.
 
         For instance,
 
@@ -817,15 +817,17 @@ def returnScipySignalLTI(self, strict=True):
         ----------
         strict : bool, optional
             True (default):
-              `tfobject` must be continuous or discrete.
-              `tfobject.dt`cannot be None.
+                The timebase `tfobject.dt` cannot be None; it must be
+                continuous (0) or discrete (True or > 0).
             False:
-              if `tfobject.dt` is None, continuous time signal.TransferFunction
-              objects are is returned
+                if `tfobject.dt` is None, continuous time scipy.signal.lti
+                objects are returned
 
         Returns
         -------
         out : list of list of scipy.signal.TransferFunction
+            continuous time (inheriting from scipy.signal.lti)
+            or discrete time (inheriting from scipy.signal.dlti) SISO objects
         """
         if strict and self.dt is None:
             raise ValueError("with strict=True, dt cannot be None")
