Fzero Issues with complex equation with complex roots

3 views (last 30 days)
Jeffrey Denomme
Jeffrey Denomme on 16 Feb 2014
Answered: Paul on 16 Feb 2014
I have the following code:
Zo = 50;
Zl = 10;
Bl = (0:0.01:(4*pi));
x = @(Bl)Zo*((Zl+j*Zo*tan(Bl))./(Zo+j*Zl*tan(Bl)));
[Blx,Zin] = fzero(x,[2,4]);
fprintf('\n\nValue of x is %2.3f.',Blx)
fprintf('\n\nFunction value is %2.3f.',Zin)
I get the standard error: Function values at interval endpoints must be finite and real.
I would like to identify the root located at Pi with no imaginary component. Using abs() results in NaN.
Assistance required.

Sign in to answer this question.

Accepted Answer

Paul
Paul on 16 Feb 2014
The value of the function at pi is 10, not 0. Do you mean you want the value where the imaginary part of the function is 0? Then you can change the function to this:
x=@(Bl)imag(Zo*((Zl+j*Zo*tan(Bl))./(Zo+j*Zl*tan(Bl))));

More Answers (0)

Categories

Find more on Optimization in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!