how can I get y which correspond to x and then plot (x,y)??

syms x y

x=[-4:1:4]

f = y^3+0.2*exp(-1*x^2)*y^2-2.2039*y^2+0.8155 == 0;

Answer 1

[Rafael Hernandez-Walls]

Try this:

x=linspace(-4,4);
for r=1:length(x)
    y(r)=fzero(@(y)y.^3+0.2*exp(-1*x(r).^2)*y.^2-2.2039*y.^2+0.8155,1);
end
plot(x,y)