day1-8-numpay随机模块

In [1]:

import numpy as np
#所有的值都是从0到1
np.random.rand(3,2)

Out[1]:

array([[0.51504028, 0.75915907],
       [0.93532186, 0.16917838],
       [0.04486651, 0.01075879]])

In [2]:

#返回的是随机的整数，左闭右开
np.random.randint(10,size = (5,4))

Out[2]:

array([[0, 6, 2, 8],
       [9, 2, 1, 9],
       [2, 9, 5, 5],
       [9, 1, 6, 7],
       [0, 7, 3, 8]])

In [3]:

np.random.rand()

Out[3]:

0.5855043888309002

In [4]:

np.random.random_sample()

Out[4]:

0.3699724022442087

In [5]:

np.random.randint(0,10,3)

Out[5]:

array([2, 3, 6])

In [6]:

mu, sigma = 0,0.1
np.random.normal(mu,sigma,10)

Out[6]:

array([-0.16629726,  0.22112744,  0.04230024, -0.00186614, -0.09426467,
       -0.07225126,  0.03106858, -0.02735602,  0.07936813, -0.21691869])

In [7]:

np.set_printoptions(precision = 2)

In [8]:

mu, sigma = 0,0.1
np.random.normal(mu,sigma,10)

Out[8]:

array([-0.07,  0.07,  0.02,  0.13, -0.03, -0.11, -0.09, -0.02,  0.12,
       -0.03])

 

洗牌¶

In [11]:

array1 = np.arange(10)
array1

Out[11]:

array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])

In [12]:

np.random.shuffle(array1)

In [13]:

array1

Out[13]:

array([5, 8, 9, 1, 3, 4, 6, 0, 7, 2])

 

随机种子¶

In [14]:

np.random.seed(100)

In [15]:

mu, sigma = 0,0.1
np.random.normal(mu,sigma,10)

Out[15]:

array([-0.17,  0.03,  0.12, -0.03,  0.1 ,  0.05,  0.02, -0.11, -0.02,
        0.03])

In [ ]: