Did you try this?
amplitude = 0.1;
frequency = 100
numSamples = 100000
samplingFrequency = 22050
numSeconds = numSamples / samplingFrequency
x = linspace(0, numSeconds, numSamples);
y = amplitude * sin(2 * pi * x * frequency);
plot(x, y, 'b-', 'LineWidth', 2);
grid on;
xlabel('X', 'FontSize', 15);
ylabel('Y', 'FontSize', 15);
Best Answer