Plotting a graph to show the variation in time of a current

Question

Eduard-Mihai 2022-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/1832818-plotting-a-graph-to-show-the-variation-in-time-of-a-current

回答： Sameer Pujari 2022-10-25

在 MATLAB Online 中打开

Hello,

I have the following current with the expression:

i =13*sqrt(2)*sqrt(2)*sin(2* pi*40*t-8.13)

and i want to plot the variation in time over 1.5 period.

I tried something i have seen on the cummunity:

period = 1/40
Periods = 1.5 * period
t = linspace(0,Periods, 1000);
i =13*sqrt(2)*sqrt(2)*sin(2* pi * t/period-8.13);
plot(t, i, 'b-', 'LineWidth', 2);
grid on;

and it shows this graph:

but the correct graph i know is this one:

(the blue line is for the current i wrote above)

Can somebody help me write the correct code to obtain the correct results?

Thank you!

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dpb 2022-10-22

在 MATLAB Online 中打开

i =13*sqrt(2)*sqrt(2)*sin(2* pi*40*t-8.13)

What's the point of sqrt(2)*sqrt(2) in the above? That's just 2 identically.

There's no way to produce the other figure from your code without defining three timeseries; the three there all have differing amplitudes and phase shifts (although the bue one is pretty near zero, it isn't quite) and they're all over what appears to be identically 2 periods, not 1.5.

You'll have to define what those curves are supposed to be representing first...

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