Python(.T)中的语法 [英] Syntax in Python (.T)

问题描述

在SciPy中用于多元正态采样函数的帮助资源中，他们给出了以下示例:

In the help resource for the multivariate normal sampling function in SciPy, they give the following example:

x,y = np.random.multivariate_normal(mean,cov,5000).T

我的问题很基本:最终的.T实际做什么?

My question is rather basic: what does the final .T actually do?

非常感谢，我知道这很简单，但是很难在Google中找到".T".

Thanks a lot, I know it is fairly simple, but it is hard to look in Google for ".T".

推荐答案

.T访问对象的属性T，该属性恰好是NumPy数组. T属性是数组的转置，请参见

The .T accesses the attribute T of the object, which happens to be a NumPy array. The T attribute is the transpose of the array, see the documentation.

显然，您是在平面上创建随机坐标. multivariate_normal()的输出可能如下所示:

Apparently you are creating random coordinates in the plane. The output of multivariate_normal() might look like this:

>>> np.random.multivariate_normal([0, 0], [[1, 0], [0, 1]], 5)  
array([[ 0.59589335,  0.97741328],
       [-0.58597307,  0.56733234],
       [-0.69164572,  0.17840394],
       [-0.24992978, -2.57494471],
       [ 0.38896689,  0.82221377]])

此矩阵的转置为:

array([[ 0.59589335, -0.58597307, -0.69164572, -0.24992978,  0.38896689],
       [ 0.97741328,  0.56733234,  0.17840394, -2.57494471,  0.82221377]])

可以通过序列解包方便地分为x和y部分.

which can be conveniently separated in x and y parts by sequence unpacking.

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