How to join two arrays in a tuple into one array in numpy

Question

I have a tuple with two arrays and I want to make it one array:

The tuple:

(array([['No', 'Yes', 'No', 'No'],
       ['No', 'Yes', 'No', 'Yes'],
       ['No', 'No', 'No', 'Yes']], dtype='<U7'), 
array([['Yes', 'No', 'No', 'Yes']], dtype='<U7'))

I need to make it one array, so that it looks like :

   (array([['No', 'Yes', 'No', 'No'],
           ['No', 'Yes', 'No', 'Yes'],
           ['No', 'No', 'No', 'Yes'],
           ['Yes', 'No', 'No', 'Yes']], dtype='<U7'))

How can I do this?

mgilson · Accepted Answer · 2017-03-03 18:06:05Z

5

Just np.vstack them

np.vstack(tuple_of_array)

example from my terminal:

>>> import numpy as np
>>> array = np.array  # Because I'm lazy and wanted to copy/paste your input ;-)
>>> arrays = (array([['No', 'Yes', 'No', 'No'],
...        ['No', 'Yes', 'No', 'Yes'],
...        ['No', 'No', 'No', 'Yes']], dtype='<U7'), 
... array([['Yes', 'No', 'No', 'Yes']], dtype='<U7'))
>>> np.vstack(arrays)
array([[u'No', u'Yes', u'No', u'No'],
       [u'No', u'Yes', u'No', u'Yes'],
       [u'No', u'No', u'No', u'Yes'],
       [u'Yes', u'No', u'No', u'Yes']], 
      dtype='<U7')

answered Mar 3, 2017 at 18:06

mgilson

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1 Comment

nanachan Over a year ago

Thank you so much! I am new to Numpy and tried everything except for this :)

Germán Aquino · Accepted Answer · 2017-03-03 18:25:20Z

0

You can also do this:

t = (array([['No', 'Yes', 'No', 'No'],
       ['No', 'Yes', 'No', 'Yes'],
       ['No', 'No', 'No', 'Yes']], dtype='<U7'), 
array([['Yes', 'No', 'No', 'Yes']], dtype='<U7'))

np.append(t[0], t[1], axis=0)

answered Mar 3, 2017 at 18:25

Germán Aquino

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1 Comment

hpaulj Over a year ago

Don't recommend np.append. It confuses people. It is just anther way of using concatenate.

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