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How to use 'create empty np array' in Python

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theoneandonlywoj/Machine-Learning-For-Trading
11def create_empty_arrays():
12	oneD_empty = np.empty(5)
13	twoD_empty = np.empty((5,4))
14	threeD_empty = np.empty((5,4,3))
15
16	print('1D array')
17	print(oneD_empty)
18
19	print('2D array')
20	print(twoD_empty)
21
22	print('3D array')
23	print(threeD_empty)
scipy/scipy-svn
12def create_array():
13    """Creates a simple 3D numpy array with unique values at each
14    location in the matrix.
15
16    """
17    rows, cols, depth = 2, 3, 4
18    arr = numpy.zeros((rows, cols, depth), 'i')
19    count = 0
20    for i in range(rows):
21        for j in range(cols):
22            for k in range(depth):
23                arr[i,j,k] = count
24                count += 1
25    return arr

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