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NumPy | vstack method

schedule Aug 12, 2023

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Parameters Return values Examples Concatenating 1D arrays Concatenating 2D arrays

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Numpy's vstack(~) method is used to vertically concatenate arrays.

Parameters

1. tup | array-like

The arrays that will concatenated vertically.

Return values

A Numpy array with the provided arrays vertically concatenated.

Examples

Concatenating 1D arrays


        
        
            
                
                
                    x = np.array([1,2,3]) 
y = np.array([4,5,6]) 
z = np.vstack([x,y])
z
                
            
            array([[1, 2, 3],
       [4, 5, 6]])

Note that you aren't limited to concatenating just two arrays at once - you can pass in as many as you wish.

Concatenating 2D arrays


        
        
            
                
                
                    x = np.array([[1,2],[3,4]]) 
y = np.array([[5,6],[7,8]]) 
z = np.vstack([x,y])
z
                
            
            array([[1, 2],
       [3, 4],
       [5, 6],
       [7, 8]])

Just to make it easier to process this, here's x and y pretty-formatted:


        
        
            
                
                
                    x = [[1, 2],     y = [[5, 6] 
     [3, 4]]          [7, 8]]

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Published by Isshin Inada

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