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NumPy | identity method

schedule Aug 12, 2023

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Parameters Return value Examples Basic usage

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Numpy's identity(~) method returns the identity matrix of the specified size.

Parameters

1. n | int

The size of the matrix (i.e. number of rows and columns).

2. dtype | string or type | optional

The desired data type of the returned identity matrix. By default, dtype=Float.

Return value

A 2D Numpy array that represents the identity matrix.

Examples

Basic usage

To create an identity matrix of size 3:


        
        
            
                
                
                    np.identity(3)
                
            
            array([[1., 0., 0.],
       [0., 1., 0.],
       [0., 0., 1.]])

To create an identity matrix of type int64:


        
        
            
                
                
                    np.identity(3, dtype="int64")
                
            
            array([[1, 0, 0],
       [0, 1, 0],
       [0, 0, 1]])

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