Fixing bug in xferfcn._evalfr that caused ValueError for discrete systems when list of angular frequencies contained more than one element

Andrew D. McGuire · Andrew D. McGuire · commit 8d64dd16c911 · 2018-12-20T10:25:33.000-05:00
diff --git a/control/xferfcn.py b/control/xferfcn.py
@@ -510,7 +510,7 @@ def _evalfr(self, omega):
             # Convert the frequency to discrete time
             dt = timebase(self)
             s = exp(1.j * omega * dt)
-            if (omega * dt > pi):
+            if np.any(omega * dt > pi):
                 warn("_evalfr: frequency evaluation above Nyquist frequency")
         else:
             s = 1.j * omega
