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Asked by aaa on 24 Apr 2012

Hi,

I am having some trouble plotting a sine wave and i'm not sure where i am going wrong.

i have

t = [0:0.1:2*pi] a = sin(t); plot(t,a)

this works by itself, but i want to be able to change the frequency. When i run the same code but make the change

a = sin(2*pi*60*t)

the code returns something bad. What am i doing wrong? How can i generate a sin wave with different frequencies?

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Answer by Rick Rosson on 24 Apr 2012

Accepted answer

Please try:

%% Time specifications: Fs = 8000; % samples per second dt = 1/Fs; % seconds per sample StopTime = 0.25; % seconds t = (0:dt:StopTime-dt)'; % seconds

%% Sine wave: Fc = 60; % hertz x = cos(2*pi*Fc*t);

% Plot the signal versus time: figure; plot(t,x); xlabel('time (in seconds)'); title('Signal versus Time'); zoom xon;

HTH.

Rick

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