擅长:python、mysql、java
<p><a href="http://docs.scipy.org/doc/numpy-1.5.x/reference/generated/numpy.outer.html" rel="noreferrer">np.outer</a>
是一个内置的:</p>
<pre><code>A = array([1,2,3])
print "outer:", np.outer( A, A )
</code></pre>
<p>(<code>transpose</code>不起作用,因为<code>A.T</code>与for 1d数组完全相同:</p>
<pre><code>print A.shape, A.T.shape, A[:,np.newaxis].shape
>>> ( (3,), (3,), (3, 1) )
</code></pre>
<p>(第页)</p>