add default

rochisha0 · Jul 12, 2024 · c3f5dc6 · c3f5dc6
1 parent f029e55
commit c3f5dc6
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/qutip/core/qobj.py b/qutip/core/qobj.py
@@ -798,7 +798,7 @@ def diag(self) -> np.ndarray:
             out = np.real(out)
         return out
 
-    def expm(self, dtype) -> Qobj:
+    def expm(self, dtype: LayerType = _data.Dense) -> Qobj:
         """Matrix exponential of quantum operator.
 
         Input operator must be square.