What is the script to plot the following function in MatLab? (I don't have syms function, those are ln(r) in function)

Answer 1

[Voss]

% One way
f = @(r)0.25*r.^2 - 1.821*log(r) + 0.249 + 0.455*log(r) - 0.5;
fplot(f);

% Another way
r = 0.05:0.001:5;
y = 0.25*r.^2 - 1.821*log(r) + 0.249 + 0.455*log(r) - 0.5;
plot(r,y)