Fix python3 bug in freqresp for discrete-time systems

cwrowley · cwrowley · commit da874f7b5352 · 2014-08-13T21:52:52.000-04:00
diff --git a/control/xferfcn.py b/control/xferfcn.py
@@ -611,7 +611,7 @@ def freqresp(self, omega):
         omega.sort()
         if isdtime(self, strict=True):
             dt = timebase(self)
-            slist = map(lambda w: exp(1.j * w * dt), omega)
+            slist = np.array([exp(1.j * w * dt) for w in omega])
             if (max(omega) * dt > pi):
                 warn("evalfr: frequency evaluation above Nyquist frequency")
         else:
