Why does it gives matrix dimension must agree?

i am trying to plot this equation: x=0.011*V+(1.3e-5*V/R^2)

program:

R=3e-7:1e-7:10e-7;

V=0.5;

Vth=0.011*V+(1.3e-5*V/R.^2);

plot(R,Vth);

Answer 1

[Mischa Kim]

Anwesha, use

 R   = 3e-7:1e-7:10e-7;
 V   = 0.5;
 Vth = 0.011*V + (1.3e-5*V./R.^2);  % note the dot in front of / sign
 plot(R,Vth);

Answer 2

[rifat]

You are not dividing element by element. Use the following lines instead:

R=3e-7:1e-7:10e-7;
V=0.5;
Vth=0.011*V+(1.3e-5*V./R.^2);
plot(R,Vth);