擅长:python、mysql、java
<p>为什么不使用矩阵切片?<a href="http://docs.scipy.org/doc/numpy/reference/arrays.indexing.html" rel="nofollow">[offical python docs]</a></p>
<p>下面是一个通过提取任意(即非连续)行和列来构建子矩阵的SO线程
<a href="https://stackoverflow.com/questions/4257394/slicing-of-a-numpy-2d-array-or-how-do-i-extract-an-mxm-submatrix-from-an-nxn-ar">Slicing of a numpy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)</a></p>