Hackerrank Polynomials Solution

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]

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

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 in python3#

Approach 1.

import numpy
print(numpy.polyval(numpy.array(input().split(),float),int(input())))

Approach 2.

import numpy
print(numpy.polyval(tuple(map(float, input().split())), float(input())))

Approach 3.

import numpy
print (numpy.polyval(list(map(float, input().split())), float(input())))

Solution in python#

Approach 1.

import numpy as np
A = map(float,raw_input().split())
print np.polyval(A,input())

Approach 2.

import numpy
print numpy.polyval(map(float,raw_input().split()),float(raw_input()))

Approach 3.

import numpy
print numpy.polyval(map(float, raw_input().split()), float(raw_input()))