Why the line is not shown in the graph?

I am about to make "for loop" and plot 2 functions against frequency. When I run the code there is no error stated however, when the graph's window pop out it gives no result (blank graph). Is there anything that I miss in my loop? Or anything that I have to improve in the code?

Answer 1

[Rik]

You are not indexing the trans variable inside your loop, which results in you overwriting the value every loop iteration. That means you are plotting a vector with a scalar, which you don't see, because you haven't set a marker.