擅长:python、mysql、java
<p>对于那些几年前登陆这个页面的人来说,OP找到了最初问题的原因,但是更简单的解决方法是:<code>np.dstack()</code>。<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.dstack.html#numpy.dstack" rel="nofollow noreferrer">numpy.dstack</a></p>
<pre><code>import numpy as np
import matplotlib.pyplot as plt
Z = np.vstack([np.zeros((1, 256)), np.zeros((1, 256,)), np.zeros((1, 256,))])
im = plt.imshow(np.dstack(Z), interpolation='none', aspect='auto')
plt.colorbar(im, orientation='horizontal')
plt.show()
</code></pre>
<p><img src="https://i.stack.imgur.com/qEjzq.png" alt="result"/></p>