Python 为什么这不是'；t打印出X，Y np数组

所以我有一个带有X，Y属性编号的数据框

activities\u和

。我想创建一个numpy数组

[[x1，y1]

[x2，y2]

[x3，y3]]

但它只打印最后一行

data = np.array([activities_and_attractions.X[0], activities_and_attractions.Y[0]])

for i in range(len(activities_and_attractions.index)):
    np.vstack((data, np.array([activities_and_attractions.X[i], activities_and_attractions.Y[i]])))

print(data)

---

您需要将

vstack

的输出分配给循环中的

data

：

for i in range(len(activities_and_attractions.index)):
    data = np.vstack((data, np.array([activities_and_attractions.X[i], activities_and_attractions.Y[i]])))  # assign to data

考虑为此任务使用。以这种方式增长NDARRAY是没有效率的

有什么问题吗

data = np.array( (activities_and_attractions.X, activities_and_attractions.Y) )