HackerRank Polynomials problem solution in Python

HackerRank Polynomials problem solution in Python – In this Polynomials problem in Python programming, you are given the coefficients of a polynomial P. Your task is to find the value of P at point x.

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]

roots

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

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

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.        ]

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]

polyval

The polyval tool evaluates the polynomial at specific value.

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

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]

HackerRank Polynomials problem solution in Python 2.

import numpy
L = map(float, raw_input().split())
x = float(raw_input())

print numpy.polyval(L, x)

Polynomials solution in Python 3.

import numpy
n = list(map(float,input().split()));
m = input();
print(numpy.polyval(n,int(m)));

Problem solution in pypy programming.

# Enter your code here. Read input from STDIN. Print output to STDOUT
import numpy 

p = numpy.array(raw_input().split(), float)
x = float(raw_input())
print numpy.polyval(p, x)

Problem solution in pypy3 programming.

# Enter your code here. Read input from STDIN. Print output to STDOUT

a = list(map(float, input().split()))
x = float(input())

print(sum([y*x**(len(a)-1-i) for i,y in enumerate(a)]))