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How to add one polynomial to another using NumPy in Python?

  • Last Updated : 29 Aug, 2020

In this article, Let’s see how to add one polynomial to another. Two polynomials are given as input and the result is the addition of two polynomials.

  • The polynomial p(x) = C3 x2 + C2 x + C1  is represented in NumPy as : ( C1, C2, C3 ) { the coefficients (constants)}. 
  • Let take two polynomials p(x) and q(x) then add these to get r(x) = p(x) + q(x) as a result of addition of two input polynomials.
If p(x) = A3 x2 + A2 x + A1 
and
q(x) = B3 x2 + B2 x + B1 

then result is 
r(x) = p(x) + q(x) 
i.e;
r(x) = (A3 + B3) x2 + (A2 + B2) x + (A1 + B1)
 
and output is 
( (A1 + B1), (A2 + B2), (A3 + B3) )

Below is the implementation with some examples :

Example 1: simple_use

Python3




# importing package
import numpy
  
# define the polynomials
# p(x) = 5(x**2) + (-2)x +5
px = (5,-2,5)
  
# q(x) = 2(x**2) + (-5)x +2
qx = (2,-5,2)
  
# add the polynomials
rx = numpy.polynomial.polynomial.polyadd(px,qx)
  
# print the resultant polynomial
print(rx)

Output :

[ 7. -7.  7.]

Example 2: #add_with_decimals

Python3




# importing package
import numpy
  
# define the polynomials
# p(x) = 2.2
px = (0,0,2.2)
  
# q(x) = 9.8(x**2) + 4
qx = (9.8,0,4)
  
# add the polynomials
rx = numpy.polynomial.polynomial.polyadd(px,qx)
  
# print the resultant polynomial
print(rx)

Output :

[ 9.8  0.   6.2]

Example 3: eval_then_add

Python3




# importing package
import numpy
  
# define the polynomials
# p(x) = (5/3)x
px = (0,5/3,0)
  
# q(x) = (-7/4)(x**2) + (9/5)
qx = (-7/4,0,9/5)
  
# add the polynomials
rx = numpy.polynomial.polynomial.polyadd(px,qx)
  
# print the resultant polynomial
print(rx)

Output :

[-1.75        1.66666667  1.8       ]


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