如何在numpy中向量化字符串数组的总和？ [重复]

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• Concatenate item in list to strings 4 answers

将列表中的项连接到字符串4个答案

Is it possible to vectorize the calculation of the sum of a string array in numpy?

是否有可能在numpy中对字符串数组的总和进行向量化计算?

With a loop, I would do this:

有了循环,我会这样做:

import numpy as np

myarray = np.array(['a','b','c'])

mysum = ''
for i in myarray:
    mysum += i

print(mysum) #result: 'abc'

For floats, one can simply use the sum function:

对于浮点数,可以简单地使用sum函数:

myarray_float = np.array([1.0,2.0,3.0])

print(myarray_float.sum()) # result: 6.0

However, this is not possibe for arrays of strings, but leads to Type error: cannot perform reduce with flexible type.

但是,这不适用于字符串数组,但会导致类型错误:无法使用灵活类型执行reduce。

1 个解决方案

#1

You can just use ''.join:

你可以使用''。join:

import numpy as np

myarray = np.array(['a','b','c'])

''.join(myarray)

# 'abc'