擅长:python、mysql、java
<pre><code>In [43]: np.random.seed(0)
...: X1 = 2 * np.random.rand(5,1)
...: X2 = np.random.rand(5,1)
...: X3 = 2 * X2
In [45]: X1
Out[45]:
array([[1.09762701],
[1.43037873],
[1.20552675],
[1.08976637],
[0.8473096 ]])
In [46]: X2
Out[46]:
array([[0.64589411],
[0.43758721],
[0.891773 ],
[0.96366276],
[0.38344152]])
In [47]: X3
Out[47]:
array([[1.29178823],
[0.87517442],
[1.783546 ],
[1.92732552],
[0.76688304]])
</code></pre>
<p><code>X2</code>值介于0和1之间<code>X3</code>值是<code>X2</code>值的两倍,介于0和2之间<code>X1</code>值是不同的数字,但也在0和2之间</p>