Plotting continious-time signal

Hi, I'm a beginner in Matlab and I'd like to plot the following continious time sinusoidal x(t) = sinwt where w= pi, 3*pi/2, 2*pi. Can anybody help me how to plot this. My first attempt is as following:

t=[0:10];

subplot(2,2,1)
x1 = cos(pi*t);
plot(t,x1)

subplot(2,2,2)
x2 = cos((3*pi/2)*t);
plot(t,x2)

subplot(2,2,3)
x3 = cos(2*pi*t);
plot(t,x3)

Am I correct? Any help would be appreciated.

Answer 1

[Daniel M]

That's correct. You plotted three signals, with angular frequency of pi, 3/2*pi, and 2*pi rad/s. This corresponds to frequency of 0.5, 0.75, and 1 Hz.

Note, you might want to make increment t using a smaller step size, so the plots are smoother. Try:

t = 0:0.001:10;

[Cagatay Aslan]

Sir, can I plot the discrete versions as following?

n = 0:1:5;

x1 = cos(pi/2*n);
subplot(2,1,1)
stem(n,x1)

x2 = cos(3*pi/2*n);
subplot(2,1,2)
stem(n,x2)

[Daniel M]

You sure can, but again, give yourself more samples.

n = 0:0.1:5;

[Cagatay Aslan]

Many thanks sir.