re-introduce weighting for now

nifty/operators/laplace_operator/laplace_operator.py

@@ -111,7 +111,7 @@ class LaplaceOperator(EndomorphicOperator):
         ret /= np.sqrt(dposc)
         ret[prefix + (slice(None, 2),)] = 0.
         ret[prefix + (-1,)] = 0.
-        return Field(self.domain, val=ret)
+        return Field(self.domain, val=ret).weight(-0.5, spaces=self._space)
 
     def _adjoint_times(self, x):
         axes = x.domain.axes[self._space]
@@ -122,7 +122,7 @@ class LaplaceOperator(EndomorphicOperator):
         sl_r = prefix + (slice(1, None),)  # "right" slice
         dpos = self._dpos.reshape((1,)*axis + (nval-1,))
         dposc = self._dposc.reshape((1,)*axis + (nval,))
-        y = x.val.copy()
+        y = x.weight(0.5, spaces=self._space).val
         y /= np.sqrt(dposc)
         y[prefix + (slice(None, 2),)] = 0.
         y[prefix + (-1,)] = 0.
@@ -131,4 +131,4 @@ class LaplaceOperator(EndomorphicOperator):
         ret[sl_l] = deriv
         ret[prefix + (-1,)] = 0.
         ret[sl_r] -= deriv
-        return Field(self.domain, val=ret)
+        return Field(self.domain, val=ret).weight(-1, spaces=self._space)