Question About Plotting Trigonometric Functions

[Malstygian]

I would like to graph the following puretone sine wave:

f = 400;
t = 0:0.1:0.5;
plot(t, sin(2*pi*f*t))

However, the plot this generated did not look correct as confirmed by
plotting the same equation using my TI-83 graphing calculator.  The picture
of the result is shown below.  What am I doing wrong?

Thank you

http://www.nabble.com/file/p14482857/sin_graph.png 
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