2 numpy arrays have the exact same values.
arr1 = np.array([1,2,3,4,5])
arr2 = np.array([2,3,1,5,4])
How can I order the values in the first array the way they are ordered in the second array?
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Rauan Saturin
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Do you want arr2 to be in ascending order? – Hamza usman ghani May 24 '21 at 12:52
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@Hamza usman ghani No I need arr1 to be reordered the way arr2 is – Rauan Saturin May 24 '21 at 12:58
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You're getting in to a philosophical issue here: would `arr2 = np.array(arr1)` be acceptable? – chepner May 24 '21 at 13:19
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@chepner in the real dataset arr1 has other values attached to it, so they will need to be reordered accordingly – Rauan Saturin May 24 '21 at 13:30
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1You need a clearer example. – chepner May 24 '21 at 13:31
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Try using the np.vectorize method from here
map_dict = {x[0]:x[1] for x in zip(arr1, arr2)}
mapped_array = np.vectorize(map_dict.get)(arr1)
Jamie T
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1@Hamza no, arr2 is not an example of the desirable output, it exists in a separate dataset – Rauan Saturin May 24 '21 at 13:29
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1@Hamza That's a bit of an assumption. It seems that this is a one-to-one mapping problem – Jamie T May 24 '21 at 13:32