# Python | Numpy polynomial lagline() method

• Last Updated : 30 Jan, 2020

`np.lagline()` method is used to find a Laguerre series whose graph is a straight line.

Syntax : `np.lagline(off, scl)`
Parameters:
off, scl :[scalar] The specified line is given by off + scl*x.

Return : [ndarray] Laguerre series coefficient array for the resulting line.

Code #1 :

 `# Python program explaining ``# numpy.lagline() method  ``     ` `# importing numpy as np   ``# and numpy.polynomial.laguerre module as geek  ``import` `numpy as np  ``import` `numpy.polynomial.laguerre as geek ``     ` `# using np.lagline() method  ``res ``=` `geek.lagline(``2``, ``3``)  ``   ` `# Resulting Laguerre series ``print` `(res)  `
Output:
```[ 5 -3]
```

Code #2 :

 `# Python program explaining ``# numpy.lagline() method  ``     ` `# importing numpy as np   ``# and numpy.polynomial.laguerre module as geek  ``import` `numpy as np  ``import` `numpy.polynomial.laguerre as geek ``     ` ` ` `# using np.lagline() method  ``res ``=` `geek.lagline(``1``, ``4``)  ``   ` `# Resulting laguerre series ``print` `(res)`
Output:
```[ 5 -4]

```

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