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

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Nieves Lopez 2019-8-1

评论： Nieves Lopez 2019-8-1

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) )

Torsten 2019-8-1

编辑：Torsten 2019-8-1

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.

Nieves Lopez 2019-8-1

Thank you for your help

MATLAB Mathematics Elementary Math Polynomials

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