correct scripts

A6-simscape-nass/nass_1_active_damping.m

@@ -268,8 +268,16 @@ xlim([freqs(1), freqs(end)]);
 
 %% Verify that parallel stiffness permits to have a stable plant
 Kiff_pure_int = -200/s*eye(6);
-isstable(feedback(G_iff_m25_Rz,       Kiff_pure_int, 1))
-isstable(feedback(G_iff_m25_Rz_no_kp, Kiff_pure_int, 1))
+
+if not(isstable(feedback(G_iff_m25_Rz, Kiff_pure_int, 1)))
+    disp("Decentralized IFF is not stable with rotation")
+end
+
+if isstable(feedback(G_iff_m25_Rz_no_kp, Kiff_pure_int, 1))
+    disp("Parallel stiffness makes the decentralized IFF stable")
+else
+    warning("Decentralized IFF is not stable even with the parallel stiffness")
+end
 
 %% IFF Controller Design
 % Second order high pass filter