get index of element in numpy array python
itemindex = numpy.where(array==item)get index of element in numpy array python
itemindex = numpy.where(array==item)python find index by value
>>> ["foo", "bar", "baz"].index("bar")
1numpy find position in array
import numpy as np
heroes_1d = np.array(["Batman", "Spiderman", "Batman", "Superman"])
print(np.where(heroes_1d == 'Batman'))
# (array([0, 2]),)
print(heroes_1d[0], heroes_1d[2])
# Batman Batman
heroes_2d = np.array([
["Batman", "Spiderman", "Batman", "Superman"],
["Catwoman", "Batgirl", "Iron Man", "Batman"]
])
print(np.where(heroes_2d == 'Batman'))
# (array([0, 0, 1]), array([0, 2, 3]))
print(heroes_2d[0][0], heroes_2d[0][2], heroes_2d[1][3])
# Batman Batman Batmanfind first in np arrau
>>> t = array([1, 1, 1, 2, 2, 3, 8, 3, 8, 8])
>>> nonzero(t == 8)
(array([6, 8, 9]),)
>>> nonzero(t == 8)[0][0]
6numpy find index of matching values
import numpy as np
# init arrays
a = np.array([1,2,3,2,3,4,3,4,5,6])
b = np.array([7,2,10,2,7,4,9,4,9,8])
#using enumerate, list comprehension and set
print([key for key, val in enumerate(a) if val in set(b)])
# output
# [1, 3, 5, 7]Copyright © 2021 Codeinu
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