why is my semilogy not showing anything

Hello ,i am fairly new to MATLAB, graphs not showing up with attachment of m.file

[Walter Roberson]

abs() is not the way to extract the real part: use real() to extract the real part.

Answer 1

[Von Duesenberg]

It does plot something; you can check this if you provide a marker and exaggerate its size:

semilogy(f, Zin_real, 'ko', 'MarkerSize', 10)

But is this really what you wanted?

[Rexy]

it something like this