numpy.roots() function – Python

• Last Updated : 11 Jun, 2020

`numpy.roots()` function return the roots of a polynomial with coefficients given in p. The values in the rank-1 array p are coefficients of a polynomial. If the length of p is n+1 then the polynomial is described by: p[0] * x**n + p[1] * x**(n-1) + … + p[n-1]*x + p[n]

Syntax : numpy.roots(p)

Parameters :
p : [array_like] Rank-1 array of polynomial coefficients.

Return : [ndarray] An array containing the roots of the polynomial.

Code #1 :

 `# Python program explaining``# numpy.roots() function``     ` `# importing numpy as geek ``import` `numpy as geek `` ` `p ``=` `[``1``, ``2``, ``3``]`` ` `gfg ``=` `geek.roots(p)`` ` `print` `(gfg)`

Output :

```[-1.+1.41421356j -1.-1.41421356j]
```

Code #2 :

 `# Python program explaining``# numpy.roots() function``      ` `# importing numpy as geek ``import` `numpy as geek ``  ` `p ``=` `[``3.2``, ``2``, ``1``]``  ` `gfg ``=` `geek.roots(p)``  ` `print` `(gfg)`

Output :

```[-0.3125+0.46351241j -0.3125-0.46351241j]
```
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