fix deprecated functionality of copy keyword in iosys.linearize

sawyerbfuller · sawyerbfuller · commit 16d9e6af15ba · 2022-11-23T20:39:35.000-08:00
diff --git a/control/iosys.py b/control/iosys.py
@@ -568,7 +568,7 @@ def linearize(self, x0, u0, t=0, params=None, eps=1e-6,
             StateSpace(A, B, C, D, self.dt, remove_useless_states=False))
 
         # Set the system name, inputs, outputs, and states
-        if copy in kwargs:
+        if 'copy' in kwargs:
             copy_names = kwargs.pop('copy')
             warn("keyword 'copy' is deprecated. please use 'copy_names'",
                 DeprecationWarning)
