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# Python | Numpy np.polydomain() method

• Last Updated : 31 Dec, 2019

With the help of `np.polydomain()` method, we can get the filter having value array([-1, 1]) in polynomial series.

Syntax : `np.polydomain`
Return : Return filter of array([-1, 1])

Example #1 :

 `# Python program explaining``# numpy.polydomain() method `` ` `# import numpy and polydomain``import` `numpy as np``from` `numpy.polynomial.polynomial ``import` `polydomain`` ` `# using np.polydomain() method``for` `i ``in` `range``(``5``):``    ``ans ``=` `polydomain ``+` `[i, i ``+` `1``]``    ``print``(ans)`

Output :

[-1 2]
[0 3]
[1 4]
[2 5]
[3 6]

Example #2 :

 `# Python program explaining``# numpy.polydomain() method `` ` `# import numpy and polydomain``import` `numpy as np``from` `numpy.polynomial.polynomial ``import` `polydomain`` ` `# using np.polydomain() method``for` `i ``in` `range``(``4``):``    ``ans ``=` `polydomain ``+` `[i``-``1``, i ``+` `1``]``    ``print``(ans)`

Output :

[-2 2]
[-1 3]
[0 4]
[1 5]

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