Bugfix: import missing

ggventurini · Jun 5, 2015 · dce14e6 · dce14e6
1 parent 4eff68b
commit dce14e6
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/deltasigma/_simulateQDSM.py b/deltasigma/_simulateQDSM.py
@@ -25,7 +25,7 @@
 import scipy
 
 from scipy.linalg import lstsq
-from scipy.signal import freqz
+from scipy.signal import freqz, tf2zpk
 
 from ._ds_quantize import ds_quantize
 from ._evalTF import evalTF
@@ -119,7 +119,7 @@ def simulateQDSM(u, arg2, nlev=2, x0=None):
  form = 1
  order = ABCD.shape[0] - nq
  elif _is_num_den(arg2):
- zeros, poles, k = tf2zpk(*arg)
+ zeros, poles, k = tf2zpk(*arg2)
  form = 2
  order = max(zeros.shape)
  else: