Python机器学习之NumPy库初探

import numpy as np from numpy import * #matrix an overview mylist=[1,2,3,4,5] a=10 mymatrix=np.mat(mylist) print(a*mymatrix) #special matrix myzero=np.zeros_like([3,5]) print(myzero) myzero=np.zeros([3,5]) print(myzero) myones=np.ones([3,3]) print(myones) myrand=np.random.rand(3,4) print(myrand) myeye=np.eye(3) print(myeye) #matrix operation print(myeye+myones) print(sum(myones)) mymatrix=np.mat([[1,2,3],[4,5,6],[7,8,9]]) print(multiply(mymatrix,myones)) print(mymatrix*myones) print(power(mymatrix,2)) print(mymatrix.transpose()) #linalg print("det:", linalg.det(myeye)) print("inv:", linalg.inv(myeye)) print("rank:", linalg.matrix_rank(myeye))