Plotting a function not working

Hi.

I'm attempting to plot a function for the Current in a resistor-inductor circuit but am having no success in producing a proper graph. Why is this program not producing a graph with curves and only producing a straight line? Thanks

[Colo]

can you show me your code?

[Jonathon Mook]

I attached my .m file in the beginning

Answer 1

[Tommy]

One possible explanation:

b=cos(omega*t*phi);
c=cos(phi)*exp(-t*R/L);

In these lines you use t, which is your upper bound on the time, rather than T, a vector containing each time point. As a result, I is a scalar corresponding to the current at the last time point.

b=cos(omega*T*phi);
c=cos(phi)*exp(-T*R/L);

Using these instead, I will be a vector with the same size as T which contains the current at each time point. If you want to plot current over time, you'll need to flip your arguments to plot:

plot(T, I)

[Jonathon Mook]

I'm so stupid I didn't see that. That worked fantastic. I'm new to this, but I'm learning. Thanks so much!

[Tommy]

You're very welcome!