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Is this a bug?
import numpy as np a1=np.array(['a','b']) a2=np.array(['E','F']) In [20]: add(a1,a2) Out[20]: NotImplemented I am trying to do element-wise string concatenation. I thought Add() was the way to do it in numpy but obviously it is not working as expected.
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1- Using + operator Using + operator is the most common way to concatenate strings in python. You can concatenate two strings using this operator. The arguments should be string if you are using + operator to concatenate. Output will be an error “TypeError: unsupported operand type(s) for +: 'int' and 'str'”.
Concatenation means joining strings together end-to-end to create a new string. To concatenate strings, we use the + operator. Keep in mind that when we work with numbers, + will be an operator for addition, but when used with strings it is a joining operator.
Python NumPy concatenate arrays In numpy concatenate arrays we can easily use the function np. concatenate(). It can be used to concatenate two arrays either row-wise or column-wise. Concatenate function can take two or more arrays of the same shape and by default, it concatenates row-wise which means axis=0.
concatenate. Advertisements. Concatenation refers to joining. This function is used to join two or more arrays of the same shape along a specified axis.
This can be done using numpy.core.defchararray.add. Here is an example:
>>> import numpy as np >>> a1 = np.array(['a', 'b']) >>> a2 = np.array(['E', 'F']) >>> np.core.defchararray.add(a1, a2) array(['aE', 'bF'], dtype='<U2') There are other useful string operations available for NumPy data types.
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