[FIXED] find index of certain array that is inside array

Issue

Is there a way to find an index of an array inside another array without converting them to list or using a for loop?

I have a huge data set and I don't want to add another loop and make it slower

arr = np.array([[11, 19, 18], [14, 15, 11], [19, 21, 46], [29, 21, 19]])
find_this_array = np.array([14, 15, 11])

# I want to avoid this
a = arr.tolist()
val = find_this_array.tolist()
a.index(val)

output:

1

Solution

You can try this:

np.where((arr == find_this_array).all(axis=1))[0][0]

output:

1

You can find more details about Numpy where from their documentation:

https://numpy.org/doc/stable/reference/generated/numpy.where.html

Answered By - Kaushal Sharma