I have written a code to plot two variables x and y (which are defined in the code),though there isn't any error in execution but there is nothing in the figure i.e.the plot is blank,Can anyone help me to find whats wrong here?

function energy

figure (1); hold on;

E=1.44e9;

a=400e-6;

h=20e-6;

b=40e-6;

l=17.6e-6;

I=(1/12)*b*h.^3;

G=1.05e9;

A=b*h;

n=E*I/b;

t=(G*A/(E*I))^(1/2);

J=((n/(t*a^4))-(n/(G*A*a^4)));

F=50e-6;

x=(F*a.^2)/(E*I);

y=0.00001*n*(- 203.15*a.^4 + 463.68*a.^3 + 1912.38*a.^2 - 3466.66*a + 1290.87)*l.^2 + 0.00001*n*(33.81*a.^6 - 
115.92*a.^5 - 604.35*a.^4 + 1958.6*a.^3 + 2364.9*a.^2 - 7835.38*a + 41984.0) - x.^2*J*cos(0.0046*a.^4 + 0.0105*a.^3 + 0.0956*a.^2 + 0.2049*a + 0.0001)*(sin(0.0046*a.^4 + 0.0105*a.^3 + 0.0956*a.^2 + 0.2049*a + 0.0001) - sin(0.00001))*(0.0184*a.^3 + 0.0315*a.^2 + 0.1912*a + 0.2049);

axis('auto');

plot(x,y)

[Stalin Samuel]

plot(x,y,'*','MarkerSize',15)

[Richardson Joseph]

Thanks stalin

[Walter Roberson]

Notice that you are only plotting a single (x,y) pair, because your code does not involve vectors or arrays.