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Method argpartition

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NumPy | diag method

schedule Aug 12, 2023

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Parameters Return value Examples

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Numpy's diag(~) method returns the diagonal of the input array.

Parameters

1. a | array-like

The input array.

2. k | int | optional

If k is positive, the next diagonal on the top will be returned instead. If negative, then the diagonal on the bottom will be returned. By default, k=0.

Return value

The diagonals of the input array.

Examples

Consider the following 2D array:


        
        
            
                
                
                    a = np.array([[1,2,3],[4,5,6],[7,8,9]])
a
                
            
            array([[1, 2, 3],
       [4, 5, 6],
       [7, 8, 9]])

To get the main diagonal:


        
        
            
                
                
                    np.diag(a)
                
            
            array([1, 5, 9])

To get the diagonal with k=1:


        
        
            
                
                
                    np.diag(a, k=1)
                
            
            array([2, 6])

To get the diagonal with k=-2:


        
        
            
                
                
                    np.diag(a, k=-2)
                
            
            array([7])

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Published by Isshin Inada

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