I’ve got an array of arrays, something like: [ [1,2,3], [1,2,3], [1,2,3], ] I would like to transpose it to get the following array: [ [1,1,1], [2,2,2], [3,3,3], ] It’s not difficult to programmatically do so using loops: function transposeArray(array, arrayLength){ var newArray = []; for(var i = 0; i < array.length; i++){ newArray.push([]); }; … Read more
I use Python and NumPy and have some problems with “transpose”: import numpy as np a = np.array([5,4]) print(a) print(a.T) Invoking a.T is not transposing the array. If a is for example [[],[]] then it transposes correctly, but I need the transpose of […,…,…]. 16 Answers 16
Is there a javascript equivalent of Python’s zip function? That is, given multiple arrays of equal lengths create an array of pairs. For instance, if I have three arrays that look like this: var array1 = [1, 2, 3]; var array2 = [‘a’,’b’,’c’]; var array3 = [4, 5, 6]; The output array should be: var … Read more
Let’s take: l = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] The result I’m looking for is r = [[1, 4, 7], [2, 5, 8], [3, 6, 9]] and not r = [(1, 4, 7), (2, 5, 8), (3, 6, 9)] 14 Answers 14
I have a list of 2-item tuples and I’d like to convert them to 2 lists where the first contains the first item in each tuple and the second list holds the second item. For example: original = [(‘a’, 1), (‘b’, 2), (‘c’, 3), (‘d’, 4)] # and I want to become… result = ([‘a’, … Read more
