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NumPy | ravel method

schedule Aug 12, 2023

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Parameters Return value Examples

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Numpy's ravel(~) method flattens the input array and returns its view. This means that modifying the returned flat array would also modify the original input array.

If you want to obtain a flattened array that is a separate copy of the input array, then use flatten(~) instead.

Parameters

1. a | array-like

The input array.

Note that the order parameter is omitted here since it is rarely used.

Return value

A 1D Numpy array with the same type as a.

Examples

Consider the following 2D array:


        
        
            
                
                
                    a = np.array([[3,4],[5,6]])
a
                
            
            array([[3, 4],
       [5, 6]])

To flatten this array:


        
        
            
                
                
                    flat_a = a.ravel()
flat_a
                
            
            array([3, 4, 5, 6])

Since a view of the input array is returned, modifying flat_a would result in a getting modified:


        
        
            
                
                
                    flat_a[0]=9
a
                
            
            array([[9, 4],
       [5, 6]])

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Published by Isshin Inada

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