Combine all elements of two arrays python

Question

I have two arrays, and want to combine the ith elements in each one together:

import numpy as np
a = np.array(['a', 'b', 'c'])
b = np.array(['x', 'y', 'z'])

I want to return

array(['ax', 'by', 'cz'])

What is the function for this? Thx,

Nolen Royalty · Accepted Answer · 2013-05-03 04:01:08Z

7

>>> import numpy as np
>>> a = np.array(['a', 'b', 'c'])
>>> b = np.array(['x', 'y', 'z'])
>>> c = np.array([i+j for i, j in zip(a, b)])
>>> c
array(['ax', 'by', 'cz'],
      dtype='|S2')

@DSM makes the point that if a and b had dtype=object you could simply add the two arrays together:

>>> a = np.array(["a", "b", "c"], dtype=object)
>>> b = np.array(["x", "y", "z"], dtype=object)
>>> c = a + b
>>> c
array([ax, by, cz], dtype=object)

edited May 3, 2013 at 4:01

answered May 3, 2013 at 3:41

Nolen Royalty

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3 Comments

mike Over a year ago

Thanks, I knew it was simple, just couldn't nail it down.

Nolen Royalty Over a year ago

@mike no problem, when combining iterables it's almost always worth trying zip.

DSM Over a year ago

If a and b had dtype=object, then a+b would Just Work(tm). [Actually, I think either one would suffice.]

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