fix

nifty4/operators/scaling_operator.py

@@ -20,7 +20,6 @@ from __future__ import division
 import numpy as np
 from ..field import Field
 from ..multi.multi_field import MultiField
-from ..domain_tuple import DomainTuple
 from .endomorphic_operator import EndomorphicOperator
 
 
@@ -49,12 +48,13 @@ class ScalingOperator(EndomorphicOperator):
     """
 
     def __init__(self, factor, domain):
+        from ..sugar import makeDomain
         super(ScalingOperator, self).__init__()
 
         if not np.isscalar(factor):
             raise TypeError("Scalar required")
         self._factor = factor
-        self._domain = DomainTuple.make(domain)
+        self._domain = makeDomain(domain)
 
     def apply(self, x, mode):
         self._check_input(x, mode)