Question

使用NumPy：

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如何添加列表，例如X= numpy.zeros(shape=[1, 4], dtype=np.int)？我尝试了[1,2,3,4]和numpy.add(X,[1,2,3,4])，但都没有效果！

我知道如何使用np.hstack((1,2,3,4))方法在标准Python列表中使用它，但我想使用numpy来提高性能。

Answer 1

Numpy数组在创建后不会改变形状。因此，在调用方法zeros((1,4), ...)之后，您已经拥有一个充满零的1x4矩阵。要将其元素设置为零以外的值，您需要使用赋值运算符：

X[0] = [1, 2, 3, 4]  # does what you are trying to achieve in your question
X[0, :] = [1, 2, 3, 4]  # equivalent to the above
X[:] = [1, 2, 3, 4]  # same
X[0, 1] = 2  # set the individual element at [0, 1] to 2

将元素添加到numpy数组中

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