Plotting a sine wave going wrong

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Bhargava
Bhargava 2023-7-1
回答： Image Analyst 2023-7-1
Ran in:
So I am trying to plot a simple sine wave, and I used the code recommended here.
% Constants
fs = 8000; % Sample rate (Hz)
duration = 1; % Duration of the signal (seconds)
frequency = 3000; % Frequency of the sine wave (Hz)
% Time vector
t = 0:1/fs:duration-1/fs;
% Generate the sine wave
x = sin(2*pi*frequency*t);
% Plot the sine wave
plot(t, x);
xlabel('Time (s)');
ylabel('Amplitude');
title('Sine Wave');
But it is a very weird plot. Why is that happening?
Here's the full plot for reference:

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回答（2 个）

Ishit
Ishit 2023-7-1
编辑：Ishit 2023-7-1
Hi Bhargava,
This is beacuse of high frequency.
Increasing the frequency of a sine plot leads to a higher number of oscillations. And thus these lines seems to overlap.
In figure below you can observe as term inside of sin increases, the period decreases.
Credits: https://www.quora.com
Image Analyst
Image Analyst 2023-7-1
You're plotting so many cycles that the blue curves all overlap and make the plot solid. Either plot fewer points, or use the zoom tool to zoom way in.

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