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Creating and solving a polynomial equal to zero.

11 vues (au cours des 30 derniers jours)
Santos García Rosado
Santos García Rosado le 13 Avr 2021
Hello Mathwork's community,
I'm trying to define as many polynomial functions as columns I have inside an inital matrix A, such as:
A = [-5000 1200 750 2000 1200; -200 150 60 40 50];
Since I have two columns, there'll be two functions that should look like:
Once the polynomial functions have been defiined, I'd like to solve x when the function equals to zero, so that the output for this two cases are:
OutPuts = [0.011369, 0.056055]
I hope I've explained my-self well enough, and that someone could please give me a hand.
Thank's in advance.
Santos

Réponse acceptée

Alan Stevens
Alan Stevens le 13 Avr 2021
Something like this
A = [-5000 1200 750 2000 1200; -200 150 60 40 50];
A = fliplr(A); % Do this in order to use the roots function
R1 = roots(A(1,:)); % roots of first row: 4 values from quartic polynomial
R2 = roots(A(2,:)); % roots of second row: ditto
% R = 1./(1 + x) so x = 1/R - 1
x1 = 1./R1 - 1;
x2 = 1./R2 - 1;
x1(abs(imag(x1))>10^-8)=[]; % delete complex values
x2(abs(imag(x2))>10^-8)=[]; % delete complex values
disp(x1)
disp(x2)

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