set names of ct.s and ct.z to 's' and 'z'

murrayrm · murrayrm · commit 0b3ae85142a6 · 2023-06-29T21:34:25.000-07:00
diff --git a/control/xferfcn.py b/control/xferfcn.py
@@ -1889,8 +1889,8 @@ def _clean_part(data):
 
 
 # Define constants to represent differentiation, unit delay
-TransferFunction.s = TransferFunction([1, 0], [1], 0)
-TransferFunction.z = TransferFunction([1, 0], [1], True)
+TransferFunction.s = TransferFunction([1, 0], [1], 0, name='s')
+TransferFunction.z = TransferFunction([1, 0], [1], True, name='z')
 
 
 def _float2str(value):
