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Difference between the methods array_equal and array_equiv in NumPy

Programming

Python

NumPy

Cookbooks

Mar 9, 2022

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Both methods array_equal(~) and array_equiv(~) are similar in that they both return a single Boolean when all the elements in the given arrays are equal pair-wise.

The key difference is that array_equal returns True when the shape of the arrays exactly match, whereas array_equiv will also return True if the one array can be broadcasted to take on the same shape.

Here's an example:


        
        
            
                
                
                    np.array_equiv([1,2], [1,2])   # True
np.array_equal([1,2], [1,2])   # True


        
        
            
                
                
                    np.array_equiv([1,2], [[1,2],[1,2]])   # True
np.array_equal([1,2], [[1,2],[1,2]])   # False