题目描述
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 $\mbox{P}$.
Your task is to find the value of $\mbox{P}$ at point $\boldsymbol{x}$.
Input Format
The first line contains the space separated value of the coefficients in $\mbox{P}$.
The second line contains the value of $\boldsymbol{x}$.
Output Format
Print the desired value.
Sample Input
1.1 2 3
0
Sample Output
3.0
输入格式
见题面
输出格式
见题面