Concatenate each line of two arrays into a single one

Question

Let's say I have two arrays a and b.

a.shape is (95, 300)
b.shape is (95, 3)

How can I obtain a new array c by concatenating each of the 95 lines ?

c.shape is (95, 303)

which datatype(s)/libraries are you suing? are they tuples? are they dt from a gis library? what are the rules for combining the data structures? — dm03514, Apr 09 '14 at 16:28
Take a look are the following: http://stackoverflow.com/questions/1720421/merge-two-lists-in-python — morissette, Apr 09 '14 at 16:29

score 3 · Accepted Answer · answered Apr 09 '14 at 16:32

IIUC, you could use hstack:

>>> a = np.ones((95, 300))
>>> b = np.ones((95, 3)) * 2
>>> a.shape
(95, 300)
>>> b.shape
(95, 3)
>>> c = np.hstack((a,b))
>>> c
array([[ 1.,  1.,  1., ...,  2.,  2.,  2.],
       [ 1.,  1.,  1., ...,  2.,  2.,  2.],
       [ 1.,  1.,  1., ...,  2.,  2.,  2.],
       ..., 
       [ 1.,  1.,  1., ...,  2.,  2.,  2.],
       [ 1.,  1.,  1., ...,  2.,  2.,  2.],
       [ 1.,  1.,  1., ...,  2.,  2.,  2.]])
>>> c.shape
(95, 303)

yes, it did the trick... too bad I can't approve it fast enough — valentin, Apr 09 '14 at 16:38

Concatenate each line of two arrays into a single one

1 Answers1