MATLAB display a blank graph

2018 3 12
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更新时间：2018 3 15
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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.

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