擅长:python、mysql、java
<p>遍历二维数组的每一行,用<code>row[row < 0]</code>选择负值,然后计算这些值的总和:</p>
<pre><code>import numpy as np
a = np.array([[-1, 2, -3], [-4, 5, -6], [-7, -8, 9]]) # your array
for row in a:
neg_sum = sum(row[row < 0]) # sum of negative values
print('{} Sum of Negative Elements In This Row: {}'.format(row, neg_sum))
</code></pre>
<p>打印:</p>
^{pr2}$