diff --git a/nada_algebra/array.py b/nada_algebra/array.py
index 7112552..0387dc8 100644
--- a/nada_algebra/array.py
+++ b/nada_algebra/array.py
@@ -434,8 +434,27 @@ def wrapper(*args, **kwargs):
 
         return attr
 
-    def __setattr__(self, name, value):
+    def __setattr__(self, name: str, value: Any):
+        """
+        Overrides the default behavior of setting attributes.
+
+        If the attribute name is "inner", it sets the attribute value directly.
+        Otherwise, it sets the attribute value on the inner object.
+
+        Args:
+            name (str): The name of the attribute.
+            value: The value to set for the attribute.
+        """
         if name == "inner":
             super().__setattr__(name, value)
         else:
             setattr(self.inner, name, value)
+
+    def __len__(self):
+        """
+        Overrides the default behavior of returning the length of the object.
+
+        Returns:
+            int: The length of the inner numpy array.
+        """
+        return len(self.inner)
diff --git a/nada_algebra/funcs.py b/nada_algebra/funcs.py
index 60bfef8..96749b6 100644
--- a/nada_algebra/funcs.py
+++ b/nada_algebra/funcs.py
@@ -216,3 +216,29 @@ def output(arr: NadaArray, party: Party, prefix: str):
         list: A list of Output objects.
     """
     return NadaArray.output_array(arr, party, prefix)
+
+
+def vstack(arr_list: list) -> NadaArray:
+    """
+    Stack arrays in sequence vertically (row wise).
+
+    Args:
+        arr_list (list): A list of NadaArray objects to stack.
+
+    Returns:
+        NadaArray: The stacked NadaArray.
+    """
+    return NadaArray(np.vstack(arr_list))
+
+
+def hstack(arr_list: list) -> NadaArray:
+    """
+    Stack arrays in sequence horizontally (column wise).
+
+    Args:
+        arr_list (list): A list of NadaArray objects to stack.
+
+    Returns:
+        NadaArray: The stacked NadaArray.
+    """
+    return NadaArray(np.hstack(arr_list))
diff --git a/pyproject.toml b/pyproject.toml
index d1aae49..f435bba 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "nada-algebra"
-version = "0.1.1"
+version = "0.2.0"
 description = ""
 authors = ["José Cabrero-Holgueras <jose.cabrero@nillion.com>"]
 readme = "README.md"