转换numpy数组中特定列的dtype [英] Convert dtype of a specific column in a numpy array

问题描述

我想更改numpy列的数据类型，但是当我替换原始的numpy列时，dtype将不会成功更改.

I want change the numpy column data type, but when I to replace the original numpy column, the dtype will not change succesfully.

import numpy as np 

arraylist =[(1526869384.273246, 0, 'a0'),
(1526869385.273246, 1, 'a1'),
(1526869386.273246, 2, 'a2'),
(1526869387.273246, 3, 'a3'),
(1526869388.273246, 4, 'a4'),
(1526869389.273246, 5, 'a5'),
(1526869390.273246, 6, 'a6'),
(1526869391.273246, 7, 'a7'),
(1526869392.273246, 8, 'a8'),
(1526869393.273246, 9, 'a9'),
(1526869384.273246, 0, 'a0'),
(1526869385.273246, 1, 'a1'),
(1526869386.273246, 2, 'a2'),
(1526869387.273246, 3, 'a3'),
(1526869388.273246, 4, 'a4'),
(1526869389.273246, 5, 'a5'),
(1526869390.273246, 6, 'a6'),
(1526869391.273246, 7, 'a7'),
(1526869392.273246, 8, 'a8'),
(1526869393.273246, 9, 'a9')]

array =  np.array(arraylist)

array.dtype

dtype('<U32')

array[:,0]=array[:,0].astype("float64")
array[:,0].dtype 

>>> dtype('<U32') 

通过事件我更改了列的dtype，但是为什么我要替换原始列仍为u32?

Event through I changed the dtype of the column, but why I want to replace the orignal column it's still u32?

推荐答案

如果可以使用命名列，则可以定义dtypes的元组，并在创建过程中将它们分配给array:

If you're okay with named columns, you can define a tuple of dtypes and assign them to array during creation:

dtype = [('A', 'float'), ('B', 'int'), ('C', '<U32')]
array = np.array(arraylist, dtype=dtype)

array['A'].dtype  # note, array[: 0] does not work here since these are named columns
dtype('float64')

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