coding

I want find out the roots of the following equation f(x)=x^3-5x^2-2cos2x=lnx-1

[babu]

help me

[Walter Roberson]

Please write your equation in MATLAB format. The current form is ambiguous. For example is it ln(x-1) or ln(x)-1 ? Why is there an "=" before the ln ?

Answer 1

[Dustin]

Generate an array of all the x values you expect the root to lie within. Then, fnzeros should help you out.

http://www.mathworks.com/help/toolbox/curvefit/fnzeros.html

Answer 2

[Rikimaru83]

 Hi, You can use the MatLab symbolic tool to solve the equation. If I've understood well, You wanto to solve the equation x^3-5x^2-2cos2x-lnx+1=0:       syms x                            % symbolic variable x
EQ=x^3-5*x^2-2*cos(2*x)-log(x)+1; % equation to be solved
solution=solve(EQ)                % solve the solution