MATLAB: I am trying to make a half wave rectified sine wave plot. what am i doing wrong

plot

T=2;
t = 0:pi/100:2*pi;
w=2*pi/T;
if(sin(w*t)<0)
    y=0;
else
    y=sin(w*t);
end
plot(t, y);

Best Answer

't' is a vector and using it with if condition will not work correctly in your case. You can use logical indexing

T=2;
t = 0:pi/100:2*pi;
w=2*pi/T;
y = sin(w*t);
y(y<0) = 0
plot(t, y);

Read about logical indexing here: https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html

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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.

MATLAB: How to create a half cosine wave

If you are talking about plotting a half cosine wave you could do something like this:

t=-pi/2:0.0001:pi/2;
plot(t,cos(t))

Best Answer

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MATLAB: Sine wave oscilating around sine wave

MATLAB: How to create a half cosine wave

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