bug fix

nifty5/domains/log_rg_space.py

@@ -52,6 +52,7 @@ class LogRGSpace(StructuredDomain):
     def shape(self):
         return self._shape
 
+    @property
     def scalar_dvol(self):
         return self._dvol
 

nifty5/operators/qht_operator.py

@@ -64,7 +64,7 @@ class QHTOperator(LinearOperator):
     def apply(self, x, mode):
         self._check_input(x, mode)
         dom = self._domain[self._space]
-        x = x.val * dom.scalar_dvol()
+        x = x.val * dom.scalar_dvol
         n = self._domain.axes[self._space]
         rng = n if mode == self.TIMES else reversed(n)
         ax = dobj.distaxis(x)