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babu
babu 2011-8-6
关闭： MATLAB Answer Bot 2021-8-20
I want find out the roots of the following equation f(x)=x^3-5x^2-2cos2x=lnx-1
  2 个评论
babu
babu 2011-8-6
help me
Walter Roberson
Walter Roberson 2011-8-6
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 ?

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Dustin
Dustin 2011-8-6
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
Rikimaru83
Rikimaru83 2011-8-6
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

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