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pythonnumpymatrixrandom
Lucas VB
Lucas VB

Reputation: 29

How do I create a matrix of non-repeating random numbers with numpy, while having a range between these random numbers?

This line of code already create a 3x3 matrix populated with random numbers between 0 and 8, but some of them are duplicated. How to stop this?

initStateRandom = np.random.randint(9, size=(3,3))

Upvotes: 0

Views: 665

Answers (2)

jsievers
jsievers

Reputation: 13

You can also use 'np.random.shuffle'. It works in-place, and only along one dimension for multi-dimensional arrays, so you'd need to shuffle a temporary 1-d array like this:

    import numpy as np

    tmp=np.arange(9)
    np.random.shuffle(tmp)
    mat=np.reshape(tmp,[3,3])

Upvotes: 0

ywbaek
ywbaek

Reputation: 3031

You can use choice function from np.random, see the documentation. You can either pass in an int for the range or any ndarray.

import numpy as np

r_array = np.random.choice(9, size=(3, 3), replace=False)  # int
r_array = np.random.choice(np.arange(10, 100), size=(3, 3), replace=False)  # ndarray

Upvotes: 2

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