[英]How to make a meshgrid with holes in numpy?
您可以先創建外部矩形,然后使用過濾器取出內部矩形:
x = np.linspace(-2, 2, 20, endpoint=False)
X = np.dstack(np.meshgrid(x, x)).reshape(-1, 2) # outer rectangle
X[(np.abs(X + 0.1) > 1).any(1)].shape # take out the inner rectangle
# (300, 2) 300 = 20 * 20 (outer) - 10 * 10 (inner)
您可以使用防毒面具:
low1 = -1; high1 = 1;
n_p = 20
range1 = np.linspace(low1, high1,n_p//2, endpoint=False)
X, Y = np.meshgrid(range1, range1)
mask = ~((X < 0.4) & (X > -0.4) & (Y < 0.4) & (Y > -0.4))
np.c_[X[mask], Y[mask]]
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