MATLAB display a blank graph

hi, im trying to plot graph resistance against frequency. I managed to calculate the value of R, but i just get a blank graph when i tries to plot the result.Here is my codes

function [resistant ] = resistance(w,l,h)

   G = 1.59*10.^-8;

   u =pi*4*10.^-7;

   p= 6.30 *10.^7;

f = 0:8;

for i= 0:8;

q(i+1)=(2/(2*pi*f(i+1)*u*G)).^(1/2);

v(i+1) = 1-exp(-h/q(i+1));

r(i+1)= w*q(i+1)*v(i+1);

R = p*l/r(i+1);

end

plot(f,R);

xlim([0 8]);

xlabel('frequency');

ylabel('resistance');

title('graph');

end

I hope somebody can tell me if there are any error in my codes.

Answer 1

[Walter Roberson]

R(i+1) = p*l/r(i+1);

[rose wright]

Thanks a lot for helping