MATLAB: How can i implement fft on sine wave then plot it

fft

i want to do fft of the sin wave then want to see the plot of it

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Did you try sin(), fft(), imag(), and real(), and plot()? I attach two demos that I have that do FFTs. They probably don't do exactly what you asked but they may be instructive anyway.

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MATLAB: Sine Wave

The answer is either "You cannot", or else "sin(x)", depending what your question is intended to mean.

If you are trying to do operations on continuous functions to infinity, then the only way to do that in MATLAB is to use the symbolic toolbox.

MATLAB: Sine wave oscilating around sine wave

Hi Artur,

I understand that you want to plot a sine wave and add another sine wave of smaller amplitude to it, so that it looks like noise.

The following code may be helpful:


t = 0:0.01:2;  % time

n_t = length(t);
fs = 1;  % frequency of signal

signal = sin(2.*pi.*fs.*t);
fn = 10; % frequency of noise

noise_Amplitude = 0.1;
sine_noise = noise_Amplitude.*sin(2.*pi.*fn.*t);
plot(t, signal+sine_noise)

If the requirement is to have the original signal and noisy signal in the same plot, the following code may be used:


t = 0:0.01:2;  % time
n_t = length(t);
fs = 1;  % frequency of signal
signal = sin(2.*pi.*fs.*t);
fn = 10; % frequency of noise
noise_Amplitude = 0.1;
sine_noise = noise_Amplitude.*sin(2.*pi.*fn.*t);
plot(t, signal, 'b')
hold on
plot(t, signal+sine_noise, 'r')
hold off

Regards,

Shubhankar.

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Related Solutions

MATLAB: Sine Wave

MATLAB: Sine wave oscilating around sine wave

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