text: import  numpy as np
  
  # arr = np.empty((8,4))
  # for i in range(8):
  #     arr[i] = i
  # print(arr)
  
  arr = np.arange(15).reshape((3,5))
  print(arr)
  #矩阵的  转置
  arr1 = arr.T
  print(arr1)
  arrDot = np.dot(arr.T,arr)
  print(arrDot)
  
  