Plotting cos(omega*t)?

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shashank
shashank 2016-6-20
编辑： shashank 2016-6-20
Hi, How do you plot cos(omega*t) where omega=2*pi*f, for range of frequency like (20:2000). I am confused because there is both time and frequency, do we need to convert time to frequency domain?

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Jos (10584)
Jos (10584) 2016-6-20
编辑：Jos (10584) 2016-6-20
This might guide you a little:
t = linspace(0,10,1000) ; % time vector
f = 20 ; % a frequency
omega = 2.*pi.*f ; % calculate omega
y = cos(omega.*t) ; % calculate cosine for this time span
plot(t,y) % plot it
(btw, I prefer to use the .* notation for multiplication)
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Jos (10584)
Jos (10584) 2016-6-20
the magnitude does not change with the frequency ... Or do you mean something else?
shashank
shashank 2016-6-20
编辑：shashank 2016-6-20
This is exactly what i wanted to knw, so magnitude do not change with frequency for f=cos(w*t)?

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