Plotting a function not working

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Jonathon Mook 2020-4-10

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评论： Tommy 2020-4-11

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plot_I.m

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

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Colo 2020-4-10

can you show me your code?

Jonathon Mook 2020-4-11

I attached my .m file in the beginning

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Tommy 2020-4-11

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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)