In this example, we will create 2-D numpy array of length 2 in dimension-0, and length 4 in dimension-1 with random values. if passed an array, it will return a shuffled copy of the array; np.random.shuffle shuffles the array inplace. It will be better to provide another function to shuffle 2 / multiple arrays in-place, and in unison. Original array: [1 2 3 4 5 6] Shuffled array: [4 1 5 3 2 6] Method 2: In this method we will use shuffle() method from Random library to shuffle the given array. We can create 9 random elements and then reshape it to (3 x 3) and then use shuffle the elements using the np random shuffle() method. Generally, in Numpy, both random.permutation and random.shuffle randomly shuffle elements in an array. random . And this function shuffles the arrays only along the first axis of the multidimensional array. For example def randomize (a, b): # Generate the permutation index array. Output. Multi-dimensional arrays shuffling using arange() and shuffle() Numpy arange() method returns the ndarray object containing evenly spaced values within the given range. if passed an integer, it will return a shuffled range i.e. NumPy has an extensive list of methods to generate random arrays and single numbers, or to randomly shuffle arrays. This function shuffles the arrays in-place. The order of sub-arrays is changed but their contents remains the same. import numpy as np # Optionally you may set a random seed to make sequence of random numbers # repeatable between runs (or use a loop to run models with a repeatable # sequence of random numbers in each loop, for example to generate replicate # runs of a model with … import random import numpy as np import numpy.random a = np.array([1,2,3,4,5,6]) a.shape = (3,2) print a random.shuffle(a) # a will definitely be destroyed print a Just use: np.random.shuffle(a) Like random.shuffle, np.random.shuffle shuffles the array in-place. numpy.random.shuffle only shuffle 1 array in-place. numpy.random.shuffle(x) x: array. permutation = np . numpy.random.shuffle¶ numpy.random.shuffle (x) ¶ Modify a sequence in-place by shuffling its contents. Re-ordering a numpy array with a given list of indexes, like the following: arr = np.array([10, 20, 30, 40, 50]) idx = [1, 0, 3, 4, 2] arr[idx] will result in making a copy of the whole array. But there are differences: Difference: np.random.permutation has two differences from np.random.shuffle:. With the help of numpy.random.shuffle() method, we can get the random positioning of different integer values in the numpy array or we can say that all the values in an array will be shuffled randomly.. Syntax : numpy.random.shuffle(x) Return : Return the reshuffled numpy array. This function only shuffles the array along the first axis of a multi-dimensional array. However, the numpy.shuffle() method works in place: np.random.shuffle(arr) will not make a copy of the array and shuffle it IN PLACE. To create a 2-D numpy array with random values, pass the required lengths of the array along the two dimensions to the rand() function. 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