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Parameters Return value Examples Performing a 90-degree counter-clockwise Performing a 90-degree clockwise rotation

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NumPy | rot90 method

schedule Aug 10, 2023

Last updated

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Python●NumPy

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Parameters Return value Examples Performing a 90-degree counter-clockwise Performing a 90-degree clockwise rotation

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Numpy's rot90(~) returns a new Numpy array that is rotated by 90 degrees along the specified axis.

Parameters

1. a | array-like

The input array. The dimension must be greater than 1.

2. k | int

The number of times you want to perform the 90-degree rotation on the input array.

3. axes | array_like

For 2D arrays, you can axes=[0,1] results in a clock-wise rotation, while axes=[1,0] results in an anti-clockwise rotation.

Return value

A new Numpy array that is rotated by 90 degrees along the specified axis

Examples

Suppose we have 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]])

Performing a 90-degree counter-clockwise


        
        
            
                
                
                    np.rot(a,90 1)   # Here, k=1, which means rotation is performed just once.
                
            
            array([[3, 6, 9],
       [2, 5, 8],
       [1, 4, 7]])

Performing a 90-degree clockwise rotation


        
        
            
                
                
                    np.rot(a,90 1, axes=[1,0])
                
            
            array([[7, 4, 1],
       [8, 5, 2],
       [9, 6, 3]])

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Published by Isshin Inada

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