set PowerSpace volume factors to 1

nifty/domain_object.py

@@ -19,7 +19,6 @@
 from __future__ import division
 import abc
 from .nifty_meta import NiftyMeta
-
 from future.utils import with_metaclass
 
 
@@ -137,7 +136,7 @@ class DomainObject(with_metaclass(
 
         """
         raise NotImplementedError(
-            "There is no generic scalar_weight method for DomainObject.")
+            "There is no generic scalar_dvol method for DomainObject.")
 
     def dvol(self):
         """ Returns the volume factors of this domain, either as a floating

nifty/spaces/power_space/power_space.py

@@ -198,11 +198,7 @@ class PowerSpace(Space):
         return self.shape[0]
 
     def scalar_dvol(self):
-        return None
-
-    def dvol(self):
-        # MR FIXME: this will probably change to 1 soon
-        return np.asarray(self.rho, dtype=np.float64)
+        return 1.
 
     def get_k_length_array(self):
         return self.kindex.copy()

test/test_spaces/test_power_space.py

@@ -129,4 +129,4 @@ class PowerSpaceFunctionalityTest(unittest.TestCase):
 
     def test_dvol(self):
         p = PowerSpace(harmonic_partner=RGSpace(10,harmonic=True))
-        assert_almost_equal(p.dvol(),p.rho)
+        assert_almost_equal(p.dvol(),1.)