Make the example numbering consistent

ch-13/3.1-generating-weights/banana_shaped.py

@@ -1,50 +0,0 @@
-import numpy as np
-from matplotlib import pyplot as plt, patches
-from robot import arena
-import random
-
-fig, ax = plt.subplots()
-
-# for line in arena.boundary_lines:
-#     plt.plot([line[0][0], line[1][0]], [line[0][1], line[1][1]], color="black")
-
-poses = np.random.normal([250, 300], [2, 2], size=(200, 2))
-ax.scatter(poses[:, 0], poses[:, 1])
-
-# create a line for a motion vector
-motion_angle = 30
-motion_scale = 300
-motion_line = np.array([[250, 300], 
-  [motion_scale * np.cos(np.radians(motion_angle)), motion_scale * np.sin(np.radians(motion_angle))]])
-
-
-def get_scaled_sample_around_mean(mean, scale):
-    return mean + (random.uniform(-scale, scale) + random.uniform(-scale, scale)) / 2
-
-rotation_scale = 0.05 * abs(motion_angle) + 0.01 * abs(motion_scale)
-translation_scale = 0.05 * abs(motion_scale) + 0.01 * abs(motion_angle)
-
-motion_rotation = np.array([get_scaled_sample_around_mean(motion_angle, rotation_scale) for _ in range(poses.shape[0])])
-motion_translation = np.array([get_scaled_sample_around_mean(motion_scale, translation_scale) for _ in range(poses.shape[0])])
-
-new_poses = np.zeros_like(poses)
-new_poses[:, 0] = poses[:, 0] + motion_translation * np.cos(np.radians(motion_rotation))
-new_poses[:, 1] = poses[:, 1] + motion_translation * np.sin(np.radians(motion_rotation))
-# new_poses[:, 0] = poses[:, 0] + motion_scale * np.cos(np.radians(motion_angle))
-# new_poses[:, 1] = poses[:, 1] + motion_scale * np.sin(np.radians(motion_angle))
-
-ax.scatter(new_poses[:, 0], new_poses[:, 1])
-
-# plot the vector arrow
-ax.arrow(*motion_line[0], *motion_line[1], color="red", width=5)
-
-# plot the angles on top
-# line from original cluster middle, going east.
-ax.plot([250, 250+100], [300, 300], color="black")
-
-angle = patches.Wedge((250, 300), 100, 0, motion_angle, width=20, color=(0.3, 0.3, 0.3, 0.3))
-ax.add_patch(angle)
-ax.text(370, 330, f"{motion_angle}°", horizontalalignment="center", verticalalignment="center", 
-  fontsize="x-large")
-
-plt.show()