Vector x produce another vector s

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Dear all, this is my problem:

I have written this code:

x=-4:0.2:4

y2=x.^2

plot(x, y2)

xLabel('x-variable')

yLabel('multi-functions')

title('Orlando Bellincampi, Figure 1.1, 27/10/11')

%New Section

y3=x.^3

hold on

plot(x, y3, '--r')

p2=pow2(x)

plot(x, p2, '-.k')

Now I should do: #Add a line of code that uses the values in vector x to produce another vector s so that when plotted will give 2 cycles of a sinusoid over the range of x.

You will need to use the function sin(), whose argument is 2pix/T with T being the period of the sine wave. Determine T so that the argument ranges from -2pi to +2pi (hence two cycles). Also you will need to scale s by multiplying it with an appropriately large value, otherwise the sine wave will not be visible among the other curves.

Add a command in the program to plot the scaled data s against x, on the same graph.

Actually I am a really beginner.

What should I do? Thanks a lot for your attention and time.

Orlando