How do I plot the equipotential lines in matlab?

How do I plot the equipotential lines in matlab (matlab novice here) from the calculated electric potential of a thin rod with ends at -0.5 m and 0.5 m, and has a non-uniform linear charge density of the form: lambda=sin(pi*x/L).

Thank you!

Answer 1

[KSSV]

L = 1 ; 
x = linspace(-0.5,+0.5) ; 
lambda = sin(pi*x/L) ;
plot(x,lambda)