no data appearing in my plot

Samuel Anderson

2018 3 12

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I am trying to plot the phase velocity (mupe/mupm) as it changes as a function of the frequency (f). I'm not sure what is missing in my code to fix it. I tried adding axes to see if the data was where I thought it'd be but there wasn't any data there either.

epsilono = (10^-9)/(36*pi);
muo = 4*pi*(10^-7);
a = 0.9;
b= 0.4;
fe = (1/2*epsilono*muo)*sqrt((1/a)^2+(0/b)^2);
fm = (1/2*epsilono*muo)*sqrt((1/a)^2+(1/b)^2);
f = (8.24*10^9):(0.1*10^9):(12.4*10^9);
fef = rdivide(fe, f).*rdivide(f, fe);
fem = rdivide(fm, f).*rdivide(f, fm);
mupe = 1./(sqrt(1-fef));
mupm = 1./(sqrt(1-fem));
betae = 2.*f.*pi.*sqrt(muo*epsilono).*sqrt(1-fef);
betam = 2.*f.*pi.*sqrt(muo*epsilono).*sqrt(1-fem);
lambdae = 2*pi./betae;
lambdam = 2*pi./betam;
figure;
plot(abs(mupe), f);
ylabel('Phase Velocity')
xlabel('Frequency')
title('Frequency vs. Phase Velocity')

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Abraham Boayue 2018-3-13

Hey Samuel, Can you post the formular of the phase velocity that you are trying to plot? And the parameters too. I'm afraid to say that your code appears bit odd and uncleared. rdivide is hardly used for making division in matlab.