擅长:python、mysql、java
<p>可以使用<a href="https://numpy.org/doc/stable/reference/generated/numpy.indices.html" rel="nofollow noreferrer">^{<cd1>}</a>创建布尔掩码:</p>
<pre><code>import numpy as np
import matplotlib.pyplot as plt
shape = (1000, 2000)
i,j = np.indices(shape)
m = np.ceil(i <= j*shape[0]/shape[1]).astype(bool)
subslope = np.empty(shape, np.float32)
subslope[m] = 1501.66
subslope[~m] = 2000
plt.imshow(subslope)
</code></pre>
<p><a href="https://i.stack.imgur.com/lYIAQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lYIAQ.png" alt="enter image description here"/></a></p>