How do I make the following conversion in NumPy?
["1.1", "2.2", "3.2"] ⟶ [1.1, 2.2, 3.2]
ベストアンサー1
Well, if you're reading the data in as a list, just do np.array(map(float, list_of_strings))
(or equivalently, use a list comprehension). (In Python 3, you'll need to call list
on the map
return value if you use map
, since map
returns an iterator now.)
However, if it's already a numpy array of strings, there's a better way. Use astype()
.
import numpy as np
x = np.array(['1.1', '2.2', '3.3'])
y = x.astype(np.float)