python how to pad a numpy array with zeros

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Alessandra
09 Nov 2016
1# Basic syntax:
2# For 1D array:
3np.pad(numpy_array, (pad_left, pad_right), 'constant')
4
5# For 2D array:
6np.pad(numpy_array, ((pad_top, pad_bottom), (pad_left, pad_right)), 'constant')
7
8# Example usage:
9import numpy as np
10numpy_array = np.array([1,2,3,4,5]) # 1D array
11np.pad(numpy_array, (2, 3), 'constant') # Pad 2 left, 3 right
12--> array([0, 0, 1, 2, 3, 4, 5, 0, 0, 0])
13
14numpy_array = np.array([[1,2],[3,4]]) # 2D array
15array([[1, 2], # Before padding
16       [3, 4]])
17np.pad(numpy_array, ((1,2),(2,1)), 'constant') # Pad 1 top, 2 bottom, 2 left, 1 right
18array([[0, 0, 0, 0, 0], # After padding
19       [0, 0, 1, 2, 0],
20       [0, 0, 3, 4, 0],
21       [0, 0, 0, 0, 0],
22       [0, 0, 0, 0, 0]])
Amélie
27 Jan 2018
1>>> np.pad(a, [(1, ), (2, )], mode='constant')
2array([[ 0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.],
3       [ 0.,  0.,  1.,  1.,  1.,  1.,  1.,  0.,  0.],
4       [ 0.,  0.,  1.,  1.,  1.,  1.,  1.,  0.,  0.],
5       [ 0.,  0.,  1.,  1.,  1.,  1.,  1.,  0.,  0.],
6       [ 0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.]])
Filippo
14 Sep 2018
1>>> np.pad(a, [(1, 0), (2, 0)], mode='constant')
2array([[ 0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.],
3       [ 0.,  0.,  1.,  1.,  1.,  1.,  1.,  0.,  0.],
4       [ 0.,  0.,  1.,  1.,  1.,  1.,  1.,  0.,  0.],
5       [ 0.,  0.,  1.,  1.,  1.,  1.,  1.,  0.,  0.],
6       [ 0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.]])
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