Remove usage of np.append

manimlib/mobject/geometry.py

@@ -653,7 +653,7 @@ class Vector(Arrow):
 
     def __init__(self, direction=RIGHT, **kwargs):
         if len(direction) == 2:
-            direction = np.append(np.array(direction), 0)
+            direction = np.hstack([direction, 0])
         Arrow.__init__(self, ORIGIN, direction, **kwargs)
 
 

manimlib/mobject/mobject.py

@@ -346,10 +346,7 @@ class Mobject(Container):
         This can make transition animations nicer
         """
         def repeat_array(array):
-            return reduce(
-                lambda a1, a2: np.append(a1, a2, axis=0),
-                [array] * count
-            )
+            return np.vstack([array] * count)
         for mob in self.family_members_with_points():
             mob.apply_over_attr_arrays(repeat_array)
         return self

manimlib/mobject/types/point_cloud_mobject.py

@@ -27,7 +27,7 @@ class PMobject(Mobject):
         if not isinstance(points, np.ndarray):
             points = np.array(points)
         num_new_points = len(points)
-        self.points = np.append(self.points, points, axis=0)
+        self.points = np.vstack([self.points, points])
         if rgbas is None:
             color = Color(color) if color else self.color
             rgbas = np.repeat(
@@ -37,7 +37,7 @@ class PMobject(Mobject):
             )
         elif len(rgbas) != len(points):
             raise Exception("points and rgbas must have same shape")
-        self.rgbas = np.append(self.rgbas, rgbas, axis=0)
+        self.rgbas = np.vstack([self.rgbas, rgbas])
         return self
 
     def set_color(self, color=YELLOW_C, family=True):