# how do you plot graph sine

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nur fazima on 8 Jan 2022
Answered: Jeff Alderson on 8 Jan 2022
i need to plot graph using 10,25,50 and 100 points from v(t)=3 sin (2 pi.2000t). can anyone explain or teach me
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Torsten on 8 Jan 2022

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### Accepted Answer

Image Analyst on 8 Jan 2022
Try this. It should be pretty self-explanatory. Note in the first plot that, since it's not using enough points (sampling below the Nyquist frequency) you get aliasing, meaning the waveform does not have as many cycles as if you'd sampled it with enough points, like the 3rd and 4th plots.
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format short g;
format compact;
fontSize = 20;
% plot graph using 10,25,50 and 100 points
% from v(t)=3 sin (2 pi.2000t).
numPoints = [10, 25, 50, 100];
for k = 1 : length(numPoints)
% Get the number of points for this plot.
thisNumber = numPoints(k);
% Construct the t axis with this number of points.
t = linspace(0, 10, thisNumber);
% Compute v from t and the sin() function.
v = 3 * sin(2 * pi * t);
% Plot the result.
subplot(length(numPoints), 1, k); % New graph for this iteration.
plot(t, v, 'b.-', 'LineWidth', 2, 'MarkerSize', 18);
grid on;
caption = sprintf('Using %d points', thisNumber);
title(caption, 'FontSize',fontSize)
xlabel('t', 'FontSize',fontSize)
ylabel('v', 'FontSize',fontSize)
end
% Maximize window.
g = gcf;
g.WindowState = 'maximized'
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### More Answers (1)

Jeff Alderson on 8 Jan 2022
Please see this answer. While we can not assist in solving homework assignments for students, our self paced training and documentation is a great place for you to start.
https://www.mathworks.com/matlabcentral/answers/771408-how-do-you-plot-a-graph-of-the-sine-function?s_tid=answers_rc1-2_p2_MLT
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