#範例11-2:求 x=(2,3),以原點逆時針旋轉90°,再施加水平向1剪力變換shear的像 import numpy as np rad = np.radians(90) T1 = np.array([ [np.cos(rad),-np.sin(rad)], [np.sin(rad),np.cos(rad)] ]) T2 = np.array([ [1, 1], [0, 1] ]) x = np.array([ [2],[3] ]) y = T2 @ T1 @ x print("兩次座標轉換後的像=\n", y)