Added missing weight method to DomainObject and FieldType.

nifty/domain_object.py

@@ -48,6 +48,11 @@ class DomainObject(Versionable, Loggable, object):
         raise NotImplementedError(
             "There is no generic dim for DomainObject.")
 
+    @abc.abstractmethod
+    def weight(self, x, power=1, axes=None, inplace=False):
+        raise NotImplementedError(
+            "There is no generic weight-method for DomainObject.")
+
     def pre_cast(self, x, axes=None):
         return x
 

nifty/field_types/field_type.py

@@ -5,6 +5,13 @@ from nifty.domain_object import DomainObject
 
 class FieldType(DomainObject):
 
+    def weight(self, x, power=1, axes=None, inplace=False):
+        if inplace:
+            result = x
+        else:
+            result = x.copy()
+        return result
+
     def process(self, method_name, array, inplace=True, **kwargs):
         try:
             result_array = self.__getattr__(method_name)(array,

nifty/spaces/space/space.py

@@ -221,26 +221,6 @@ class Space(DomainObject):
     def copy(self):
         return self.__class__(dtype=self.dtype)
 
-    @abc.abstractmethod
-    def weight(self, x, power=1, axes=None, inplace=False):
-        """
-            Weights a given array of field values with the pixel volumes (not
-            the meta volumes) to a given power.
-
-            Parameters
-            ----------
-            x : numpy.ndarray
-                Array to be weighted.
-            power : float, *optional*
-                Power of the pixel volumes to be used (default: 1).
-
-            Returns
-            -------
-            y : numpy.ndarray
-                Weighted array.
-        """
-        raise NotImplementedError
-
     def get_distance_array(self, distribution_strategy):
         raise NotImplementedError(
             "There is no generic distance structure for Space base class.")