Help with a simple matlab code

Hi!

I need to write this coode to plot and calculate quantum energy levels in a quantumwell, for my laboration report.

However, I am really new to matlab, so i dont really know what im doing wrong.... All I get in the square root functions are linear dots, and matlab returns a constant value for the functions...

Code:

    b=6.0;
  h=6.582122e-16;
  m = 0.067*9.109390e-31;
  V=0.2;

E = 0:0.02:0.4;

f1=sqrt(2*m*(b^2)*(E)/(h^2));
g1=((E-V)/E);
t1=(E/(E-V));

f = tan(f1);
g = (g1)^(0.5);
t = -(t1)^(0.5);
plot(E,f,E,g,E,t)
axis([0 0.4 -10 10])

grid

Answer 1

[Oleg Komarov]

b = 6.0;
h = 6.582122e-16;
m = 0.067*9.109390e-31;
V = 0.2;

E = 0:0.02:0.4;

f1 = sqrt(2*m*b^2*E/h^2);
g1 = (E-V)./E;
t1 = E./(E-V);

f = tan(f1);
g = g1.^.5;
t = -t1.^0.5;
plot(E,f,E,g,E,t)
axis([0 0.4 -10 10])

[Stefan Oros]

Thanks alot!