Subtract one polynomial to another in Python

To subtract one polynomial to another, use the numpy.polynomial.polynomial.polysub() method in Python. Returns the difference of two polynomials c1 + c2. The arguments are sequences of coefficients from lowest order term to highest, i.e., [1,2,3] represents the polynomial 1 + 2*x + 3*x**2.

The method returns the coefficient array representing their difference. The parameters c1 and c2 returns 1-D arrays of polynomial coefficients ordered from low to high.

This numpy.polynomial.polynomial module provides a number of objects useful for dealing with polynomials, including a Polynomial class that encapsulates the usual arithmetic operations.

Steps

At first, import the required libraries -

from numpy.polynomial import polynomial as P

Declare Two Polynomials −

p1 = (3,1,6)
p2 = (2,7,3)

Display the polynomials −

print("Polynomial 1...\n",p1)
print("\nPolynomial 2...\n",p2)

To subtract one polynomial to another, use the numpy.polynomial.polynomial.polysub() method −

diffRes = P.polysub(p1,p2);
print("\nResult (Difference)...\n",diffRes)

Example

from numpy.polynomial import polynomial as P

# Declare Two Polynomials
p1 = (3,1,6)
p2 = (2,7,3)

# Display the polynomials
print("Polynomial 1...\n",p1)
print("\nPolynomial 2...\n",p2)

# To subtract one polynomial to another, use the numpy.polynomial.polynomial.polysub() method in Python.
diffRes = P.polysub(p1,p2);
print("\nResult (Difference)...\n",diffRes)

Output

Polynomial 1...
(3, 1, 6)

Polynomial 2...
(2, 7, 3)

Result (Difference)...
[ 1. -6. 3.]