Task and Solution in Python - Polynomials (HackerRank)

 

poly

The poly tool returns the coefficients of a polynomial with the given sequence of roots.

print numpy.poly([-1, 1, 1, 10])        #Output : [  1 -11   9  11 -10]

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roots

The roots tool returns the roots of a polynomial with the given coefficients.

print numpy.roots([1, 0, -1])           #Output : [-1.  1.]

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polyint

The polyint tool returns an antiderivative (indefinite integral) of a polynomial.

print numpy.polyint([1, 1, 1])          #Output : [ 0.33333333  0.5         1.          0.        ]

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polyder

The polyder tool returns the derivative of the specified order of a polynomial.

print numpy.polyder([1, 1, 1, 1])       #Output : [3 2 1]

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polyval

The polyval tool evaluates the polynomial at specific value.

print numpy.polyval([1, -2, 0, 2], 4)   #Output : 34

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polyfit

The polyfit tool fits a polynomial of a specified order to a set of data using a least-squares approach.

print numpy.polyfit([0,1,-1, 2, -2], [0,1,1, 4, 4], 2)
#Output : [  1.00000000e+00   0.00000000e+00  -3.97205465e-16]

The functions polyadd, polysub, polymul, and polydiv also handle proper addition, subtraction, multiplication, and division of polynomial coefficients, respectively.

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Task

You are given the coefficients of a polynomial .
Your task is to find the value of  at point .

Input Format

The first line contains the space separated value of the coefficients in .
The second line contains the value of .

Output Format

Print the desired value.

Sample Input

1.1 2 3
0

Sample Output

3.0

Solution

import numpy as np

P = np.array(input().split(), float)

print(np.polyval(P, float(input())))

Source : HackerRank