How to copy numpy array values at certain indices

Question

I have a numpy array and I want to copy parts of the array at certain indices to a different array.

arr = np.arange(10)
np.random.shuffle(arr)
print arr
[0 3 4 2 5 6 8 7 9 1]

I want to copy the value at the indices

copy_indices = [3, 7, 8]

Is there any good way to do this?

newarr = arr[copy_indices].

user707650
– user707650

2017-03-19 20:20:01 +00:00
Commented Mar 19, 2017 at 20:20 — user707650
– user707650, Commented Mar 19, 2017 at 20:20
You're right @Evert

kmario23
– kmario23

2017-03-19 21:45:19 +00:00
Commented Mar 19, 2017 at 21:45 — kmario23
– kmario23, Commented Mar 19, 2017 at 21:45

kmario23 · Accepted Answer · 2018-01-18 02:05:44Z

1

How about using this approach?

In [16]: arr
Out[16]: array([2, 9, 5, 6, 1, 4, 7, 8, 3, 0])

In [17]: copy_indices
Out[17]: [3, 7, 8]

In [18]: sliced_arr = np.copy(arr[copy_indices, ])

# alternatively
# In [18]: sliced_arr = arr[copy_indices, ]

In [19]: sliced_arr
Out[19]: array([6, 8, 3])

P.S.: Advanced indexing (as here) actually returns copy of the array. So, the use of np.copy() is optional.

edited Jan 18, 2018 at 2:05

answered Mar 19, 2017 at 21:39

kmario23

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