Fix Python – How to convert an array of strings to an array of floats in numpy?

by

Question

Asked By – Meh

How to convert

["1.1", "2.2", "3.2"]

to

[1.1, 2.2, 3.2]

in NumPy?

Now we will see solution for issue: How to convert an array of strings to an array of floats in numpy?

Answer

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)

This question is answered By – Joe Kington

This answer is collected from stackoverflow and reviewed by FixPython community admins, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0