# Python | Numpy np.lagfromroots() method

`np.lagfromroots()` method is used to generate a Laguerre series with given roots.

Syntax : `np.lagfromroots(roots)`
Parameters:
roots :[array_like] Input sequence containing the roots.

Return : [ndarray] 1-D array of coefficients of Laguerre series.

Code #1 :

 `# Python program explaining ` `# numpy.lagfromroots() method  ` `   `  `# importing numpy as np   ` `# and numpy.polynomial.laguerre module as geek  ` `import` `numpy as np  ` `import` `numpy.polynomial.laguerre as geek ` `   `  `# Input roots ` ` `  `roots ``=` `(``2``, ``4``, ``8``)  ` `    `  `# using np.lagfromroots() method  ` `res ``=` `geek.lagfromroots(roots)  ` ` `  `# Resulting laguerre series coefficient ` `print` `(res)  `

Output:

```[-30. -18. -10.  -6.]
```

Code #2 :

 `# Python program explaining ` `# numpy.lagfromroots() method  ` `   `  `# importing numpy as np   ` `# and numpy.polynomial.laguerre module as geek  ` `import` `numpy as np  ` `import` `numpy.polynomial.laguerre as geek ` `   `  `# Input roots ` `s ``=` `(``1``, ``2``, ``3``, ``4``, ``5``)  ` ` `  `   `  `# using np.lagfromroots() method  ` `res ``=` `geek.lagfromroots(s)  ` ` `  `# Resulting laguerre series coefficient ` `print` `(res)  `

Output:

```[ -26.  -64.  120. -270.  240. -120.]

```
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