擅长:python、mysql、java
<pre><code>import numpy as np
A = np.array([[0, 1, 1, 0, 0, 0],
[0, 0, 1, 1, 1, 1],
[0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 1, 0],
[0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0]])
convex = np.triu(A, 1) # upper triangle
concave = np.tril(A, -1) # lower triangle
convex_indices = list(zip(np.nonzero(convex)[0] + 1, np.nonzero(convex)[1] + 1))
concave_indices = list(zip(np.nonzero(concave)[0] + 1, np.nonzero(concave)[1] + 1))
num_convex = len(convex_indices)
num_concave = len(concave_indices)
print('There are {} convex connections between faces: {}'.format(num_convex, ', '.join(str(e) for e in convex_indices)))
print('There are {} concave connections between faces: {}'.format(num_concave, ', '.join(str(e) for e in concave_indices)))
# will print:
# There are 7 convex connections between faces: (1, 2), (1, 3), (2, 3), (2, 4), (2, 5), (2, 6), (4, 5)
# There are 0 concave connections between faces:
</code></pre>