Dave31415 Dave31415 - 6 months ago 90
Python Question

Element-wise string concatenation in numpy

Is this a bug?

import numpy as np

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.


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'], 

There are other useful string operations available for NumPy data types.