fsolve to solve 5th order polynomial

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jojo
jojo 2019-12-14
回答： jojo 2019-12-14
I would like to solve the following polynomial numerically for r:
I am trying to use fzero as follows:
r= (5/(r^2*9))- ((2)/(9*(6-r)^2))
x0 = 10; % some initial point
x = fzero(r,x0)
How can this be solved using fzero?

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采纳的回答

jojo
jojo 2019-12-14
This works.
fun=@(r) (5/(r^2*9))- ((2)/(9*(6-r)^2))-r;
x0 = 10; % some initial point
x = fsolve(fun,x0)

更多回答（1 个）

Walter Roberson
Walter Roberson 2019-12-14
You have an equation of the form A=B. Subtract B from both sides giving an equation of the form (A) - (B) = 0. Now you can fsolve

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