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Fastest way to append nonzero numpy array elements to list
I want to add all nonzero elements from a numpy array arr to a list out_list. Previous research suggests that for numpy arrays, using np.nonzero is most efficient. (My own benchmark below actually...
View ArticleAnswer by Mad Physicist for Fastest way to append nonzero numpy array...
Instead of extending a list by all of the elements of a new array, append the array itself. This will make for much fewer and smaller reallocations. You can also pre-allocate a list of Nones up-front...
View ArticleAnswer by Pierre D for Fastest way to append nonzero numpy array elements to...
I submit that the method of choice, if you are indeed looking for a list output, is:def f(arr, out_list): out_list += arr[arr != 0].tolist()It seems to beat all the other methods mentioned so far in...
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