Plot Symbolic Functions & Find fzero Starting Guess

How can I plot a symbolic function or determine a finite and real starting guess for fzero?

shalnivardhan asked: 2020-09-03 matlab , plot , plotting

Struggling to plot symbolic functions in MATLAB or find a good starting guess for fzero? This resource provides practical solutions and guidance. Learn more now

Expert Answer

John Williams answered . 2025-07-10 02:05:04

If you have a function of one variable, you can use my newtzero to try to find some roots. You will have to convert to a function handle first.

For example:

syms s
f = s.^(2*cos(s)) -s.^3 - sin(s)+1;  % Say this is your function.
% Now to find the roots.
G = matlabFunction(f);  % Convert to func handle.
newtzero(G)  % Can use no or real or imaginary guess.

years =

     0.4192 - 0.7229i
     0.4192 + 0.7229i
     1.0584          
    -0.4221 - 1.2644i
    -0.4221 + 1.2644i
    -0.2607 - 1.8053i
     1.7397 - 1.5257i
    -4.5851 - 0.7860i

As far as the plotting goes, just use the function handle returned in G above.

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