matrix loop doesnt work

samuel herrera

2021 11 13

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how can i make a loop with the matrix a, because its not working

G=10*10-9;%

l=1*10^-3;

c=10*10^-9;

u=4*pi*10^-7;

e=(l*c)/u;

g=(u*G)/l;

vs=1;

f=60;

zs=50;

long=10:10:100;

w=2*pi*f;

z0=((j*w*l)/(g+j*w*c))^(1/2);

prop=(j*w*l*(g+j*w*c))^(1/2);

zl=30+10j;

%problem%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

for i=1:length(long)

a=[(z0+zs) (z0-zs);(z0-zl)*exp(-prop*long(i)) (z0+zl)*exp(prop*long(i))];

b=[z0*vs;0];

ain=inv(a);

v=ain*b;

vp(i) = v(1);

vn(i) = v(2);

vt(i)=vp(i)+vn(i);

end

plot(long,vt)

Warning: Imaginary parts of complex X and/or Y arguments ignored.

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Jan 2021-11-13

编辑：Jan 2021-11-13

"It is not working" is not a useful description of the problem. Yu know already, what's going wrong. Then it helps to solve your problem, if you share this knowledge.

Your code runs fine. So maybe the result differ from your expectations?

Star Strider 2021-11-13

See if the expm function helps to produce the desired result.

It looks as though the code is attempting to model a state-space system of some sort, although it is not clear to me what it does.

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