["python","arrays","numpy"]
How to remove specific elements in a numpy array

How can I remove some specific elements from a numpy array? Say I have import numpy as np a = np.array([1,2,3,4,5,6,7,8,9]) I then want to remove 3,4,7 from a. All I know is the index of the values (index=[2,3,6]).
Use numpy.delete(), which returns a new array with sub-arrays along an axis deleted. numpy.delete(a, index) For your specific question: import numpy as np a = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9]) index = [2, 3, 6] new_a = np.delete(a, index) print(new_a) # Output: [1, 2, 5, 6, 8, 9] Note that numpy.delete() returns a new array since array scalars are immutable, similar to strings in Python, so each time a change is made to it, a new object is created. I.e., to quote the delete() docs: "A copy of arr with the elements specified by obj removed. Note that delete does not occur in-place..." If the code I post has output, it is the result of running the code.