How to plot (x,y)

Hi. I'm have to plot variables x and y.

I know the range of x.

Now here's where I'm confused, I have 2 other variables, let's call them a and b

a depends on x;

b depends on a;

y depends on b. So indirectly y depends on x. Does y need to be a variable or vector? How do I plot (x,y)? The code below contains matrices but the idea is what's defined above.

Thanks for your help

clc
clear all
f=3.4:0.01:3.8;
BW=0.4;
fo=3.6;
Rs=0.982472;
Rl=0.982472;
I=eye(8);
S11=zeros(1,41);
M=[0 -0.8231 0 0 0 0 0 0;-0.8231 0 -0.59170 0 0 0 0.0251 0; 0 -0.5917 0 -0.5516 0 -0.0781 0 0;0 0 -0.5516 0 -0.4925 0 0 0;0 0 0 -0.4925 0 -0.5516 0 0;0 0 -0.0781 0 -0.5516 0 -0.5917 0;0 0.0251 0 0 0 -0.5917 0 -0.8231; 0 0 0 0 0 0 -0.8231 0];
R=[Rs 0 0 0 0 0 0 0 ; 0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 Rl];
for b=3.4:0.01:3.8
lambda=fo/BW*((b/fo)-(fo/b));
A=lambda*I-R*i+M;
for x=1:
S11(1,x)=1+2*i*Rs*inv(A(1,1));
S11(1,x)=sqrt((real(S11(1,x)))^2+(imag(S11(1,x)))^2);
S11(1,x)=10*log(S11(1,x))
end
end
plot(f,S11);

[darova]

Your f and S11 are vectors. Your code is ok. Just end this line

for x=1:

What x should be?

[John]

Yeah I removed the second for loop after more debugging, but I'm still not even close to the plot I should be seeing. Any suggestions?

[darova]

Do you have original formulas?

[John]

Yes, S11 is S11=1+2*i*Rs*inv(A(1,1)) Since A(1,1) changes with f I should get a different value of S11 for every value of f.

[John]

OK so I think the issue isn't with the code but with how I am plotting. S11 is a part of S parameters.