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# Python | Numpy np.poly2leg() method

• Last Updated : 29 Dec, 2019

With the help of `np.poly2leg()` method, we can get the Legendre series coefficient from a given polynomial.

Syntax : `np.poly2leg(polynomial)`
Return : Return the coefficient of Legendre series.

Example #1 :
In this example we can see that by using `np.poly2leg()` method, we are able to get the coefficients of Legendre series from polynomial using this method.

 `# import numpy and poly2leg``import` `numpy as np``from` `numpy.polynomial.legendre ``import` `poly2leg`` ` `arr ``=` `np.array([``0.1``, ``0.2``, ``0.3``, ``0.4``, ``0.5``])``# using np.poly2leg() method``ans ``=` `poly2leg(arr)`` ` `print``(ans)`

Output :

[ 0.3 0.44 0.48571429 0.16 0.11428571]

Example #2 :

 `# import numpy and poly2leg``import` `numpy as np``from` `numpy.polynomial.legendre ``import` `poly2leg`` ` `arr ``=` `np.array([``-``0.5``, ``-``0.4``, ``-``0.3``, ``-``0.2``, ``-``0.1``, ``0``, ``0.1``, ``0.2``, ``0.3``, ``0.4``, ``0.5``])``# using np.poly2leg() method``ans ``=` `poly2leg(arr)`` ` `print``(ans)`

Output :

[-0.52692641 -0.34424242 0.08651349 0.16149184 0.27684316 0.13948718
0.13127578 0.03905114 0.02952276 0.00421226 0.00277122]

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