NumPy 矩阵库(Matrix)

numpy.matlib.empty(shape, dtype, order)

import numpy.matlib 
import numpy as np
# 填充为随机数据
print (np.matlib.empty((2,2)))

[[-1.49166815e-154 -1.49166815e-154]
 [ 2.17371491e-313  2.52720790e-212]]

import numpy.matlib 
import numpy as np 

print (np.matlib.zeros((2,2)))

[[0. 0.]
 [0. 0.]]

import numpy.matlib 
import numpy as np 

print (np.matlib.ones((2,2)))

[[1. 1.]
 [1. 1.]]

numpy.matlib.eye(n, M,k, dtype)

import numpy.matlib 
import numpy as np 

print (np.matlib.eye(n =  3, M =  4, k =  0, dtype =  float))

[[1. 0. 0. 0.]
 [0. 1. 0. 0.]
 [0. 0. 1. 0.]]

import numpy.matlib 
import numpy as np 

# 大小为 5，类型位浮点型
print (np.matlib.identity(5, dtype =  float))

[[ 1.  0.  0.  0.  0.] 
 [ 0.  1.  0.  0.  0.] 
 [ 0.  0.  1.  0.  0.] 
 [ 0.  0.  0.  1.  0.] 
 [ 0.  0.  0.  0.  1.]]

import numpy.matlib 
import numpy as np 

print (np.matlib.rand(3,3))

[[0.23966718 0.16147628 0.14162   ]
 [0.28379085 0.59934741 0.62985825]
 [0.99527238 0.11137883 0.41105367]]

import numpy.matlib 
import numpy as np  

i = np.matrix('1,2;3,4')  
print (i)

[[1  2] 
 [3  4]]

import numpy.matlib 
import numpy as np  

j = np.asarray(i)  
print (j)

[[1  2] 
 [3  4]]

import numpy.matlib 
import numpy as np  

k = np.asmatrix (j)  
print (k)

[[1  2] 
 [3  4]]