擅长:python、mysql、java
<p>用点数学怎么样?您可以定义一个矩阵<code>M = [[0.5,0],[0.5,0],[0,0.5],[0,0.5]]</code>,这样<code>A*M</code>就是您想要的。在</p>
<pre><code>from numpy import array, matrix
A = array([[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12],
[13, 14, 15, 16]])
M = matrix([[0.5,0],
[0.5,0],
[0,0.5],
[0,0.5]])
print A*M
</code></pre>
<p>生成M也很简单,条目是<code>1/n</code>或零。在</p>