diff --git a/eminus/extras/torch.py b/eminus/extras/torch.py
index c62f2aba..55f34855 100644
--- a/eminus/extras/torch.py
+++ b/eminus/extras/torch.py
@@ -39,7 +39,7 @@ def I(atoms, W):
 
     if W.ndim < 3:
         if len(W) == len(atoms.G2):
-            Wfft = np.copy(W)
+            Wfft = W
         else:
             if W.ndim == 1:
                 Wfft = np.zeros(n, dtype=W.dtype)
@@ -48,7 +48,7 @@ def I(atoms, W):
             Wfft[atoms.active] = W
     else:
         if W.shape[1] == len(atoms.G2):
-            Wfft = np.copy(W)
+            Wfft = W
         else:
             Wfft = np.zeros((atoms.Nspin, n, atoms.Nstate), dtype=W.dtype)
             Wfft[:, atoms.active[0]] = W
@@ -132,15 +132,15 @@ def Idag(atoms, W, full=False):
 
     if W.ndim == 1:
         Wfft = Wfft.view(s)
-        F = torch.fft.fftn(Wfft, s=s, norm='backward').view(n)
+        F = torch.fft.fftn(Wfft, s=s, norm='forward').view(n)
     elif W.ndim == 2:
         Wfft = Wfft.view(s + (atoms.Nstate,))
-        F = torch.fft.fftn(Wfft, s=s, norm='backward', dim=(0, 1, 2)).view(n, atoms.Nstate)
+        F = torch.fft.fftn(Wfft, s=s, norm='forward', dim=(0, 1, 2)).view(n, atoms.Nstate)
     else:
         Wfft = Wfft.view((atoms.Nspin,) + s + (atoms.Nstate,))
-        F = torch.fft.fftn(Wfft, s=s, norm='backward', dim=(1, 2, 3)).view(atoms.Nspin, n,
-                                                                           atoms.Nstate)
-    F = F.detach().cpu().numpy()
+        F = torch.fft.fftn(Wfft, s=s, norm='forward', dim=(1, 2, 3)).view(atoms.Nspin, n,
+                                                                          atoms.Nstate)
+    F = F.detach().cpu().numpy() * n
     if not full:
         if F.ndim < 3:
             return F[atoms.active]
@@ -164,7 +164,7 @@ def Jdag(atoms, W):
 
     if W.ndim < 3:
         if len(W) == len(atoms.G2):
-            Wfft = np.copy(W)
+            Wfft = W
         else:
             if W.ndim == 1:
                 Wfft = np.zeros(n, dtype=W.dtype)
@@ -173,7 +173,7 @@ def Jdag(atoms, W):
             Wfft[atoms.active] = W
     else:
         if W.shape[1] == len(atoms.G2):
-            Wfft = np.copy(W)
+            Wfft = W
         else:
             Wfft = np.zeros((atoms.Nspin, n, atoms.Nstate), dtype=W.dtype)
             Wfft[:, atoms.active[0]] = W
@@ -184,12 +184,12 @@ def Jdag(atoms, W):
 
     if W.ndim == 1:
         Wfft = Wfft.view(s)
-        Finv = torch.fft.ifftn(Wfft, s=s, norm='backward').view(n)
+        Finv = torch.fft.ifftn(Wfft, s=s, norm='forward').view(n)
     elif W.ndim == 2:
         Wfft = Wfft.view(s + (atoms.Nstate,))
-        Finv = torch.fft.ifftn(Wfft, s=s, norm='backward', dim=(0, 1, 2)).view(n, atoms.Nstate)
+        Finv = torch.fft.ifftn(Wfft, s=s, norm='forward', dim=(0, 1, 2)).view(n, atoms.Nstate)
     else:
         Wfft = Wfft.view((atoms.Nspin,) + s + (atoms.Nstate,))
-        Finv = torch.fft.ifftn(Wfft, s=s, norm='backward', dim=(1, 2, 3)).view(atoms.Nspin, n,
-                                                                               atoms.Nstate)
-    return Finv.detach().cpu().numpy()
+        Finv = torch.fft.ifftn(Wfft, s=s, norm='forward', dim=(1, 2, 3)).view(atoms.Nspin, n,
+                                                                              atoms.Nstate)
+    return Finv.detach().cpu().numpy() / n