string of numbers into a numpy list?

Question

I want to make '1 2 3' into a numpy [1, 2, 3]

I've tried

x = '1 2 3'
x = np.fromstring(x, dtype=int, sep=' ')

and it works, but is there any other way to do it? Maybe using np.array()? Thanks.

np.array('1 2 3'.split(),int). np.array expects a list, not a string. fromstring expects a string. — hpaulj
– hpaulj, Commented Oct 9, 2021 at 7:33

mozway · Accepted Answer · 2021-10-09 07:37:28Z

1

If you really want you could do np.array(x.split()), but the numpy.fromstring method will be faster.

Timing for np.fromstring on 1000 times x: 45.2 µs ± 4.29 µs

Timing for np.array: 329 µs ± 67.6 µs

answered Oct 9, 2021 at 7:33

mozway

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1 Comment

np.array can convert to int without the previous map.