How to find the roots of a sum of divisions of polynomials

12 views (last 30 days)
How can I find those x values in which this function becomes f(x)=0?
I have 4 vectors of length N: A, B, C, D, and
f(x) = sum( ( x*A_i - B_i ) / ((x*C_i - D_i)^3) )

Accepted Answer

Torsten on 1 Aug 2019
Edited: Torsten on 1 Aug 2019
Multiply by
prod (x*C_i - D_i)^3
and determine the roots of the resulting polynomial of degree 3*(N-1)+1 using the "roots" command.
You might want to use symbolic computations in advance using expand, collect, and subst to get the numerical coefficients of this polynomial.

More Answers (0)


Find more on Numerical Integration and Differential Equations in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!