From 37ccb27086e5ea624240031d0dbc5c5cac0a7d2e Mon Sep 17 00:00:00 2001
From: Vaibhav Gupta <vaibhav.gupta@epfl.ch>
Date: Tue, 9 Sep 2025 11:31:38 +0200
Subject: [PATCH] BugFix: `place_acker` output should be 2D matrix

---
 control/statefbk.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/control/statefbk.py b/control/statefbk.py
index b6e9c9655..6625c56af 100644
--- a/control/statefbk.py
+++ b/control/statefbk.py
@@ -252,7 +252,7 @@ def place_acker(A, B, poles):
     K = np.linalg.solve(ct, pmat)
 
     K = K[-1, :]                # Extract the last row
-    return K
+    return _ssmatrix(K)
 
 
 def lqr(*args, **kwargs):