python how to pad a numpy array with zeros
# Basic syntax: # For 1D array: np.pad(numpy_array, (pad_left, pad_right), 'constant') # For 2D array: np.pad(numpy_array, ((pad_top, pad_bottom), (pad_left, pad_right)), 'constant') # Example usage: import numpy as np numpy_array = np.array([1,2,3,4,5]) # 1D array np.pad(numpy_array, (2, 3), 'constant') # Pad 2 left, 3 right --> array([0, 0, 1, 2, 3, 4, 5, 0, 0, 0]) numpy_array = np.array([[1,2],[3,4]]) # 2D array array([[1, 2], # Before padding [3, 4]]) np.pad(numpy_array, ((1,2),(2,1)), 'constant') # Pad 1 top, 2 bottom, 2 left, 1 right array([[0, 0, 0, 0, 0], # After padding [0, 0, 1, 2, 0], [0, 0, 3, 4, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]])