Help with plotting sinusoidal wave

Question

Rapheal 2012-5-17

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Hello, Im trying to plot a sinusoidal wave x(t) = 4cos(10*pi*t-pi/2) from -0.2 to 0.5 with 0.05 interval. The plot i get in matlab is a triangular wave and not a sinusoidal wave. am i missing any thing? :(

F = 5; A = 4; t = -0.2:0.05:0.5; phi = -pi/2; x = A*cos(2*pi*t*F + phi); plot(t,x) grid on

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Answer 1

Rick Rosson 2012-5-19

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在 MATLAB Online 中打开

Compare your sampling rate (in samples per second) to the frequency of your sine wave (in hertz or cycles per second). What is the ratio (both numerical value and units of measure) of the sampling rate to the sine wave's frequency? What does this information imply about the sampled sine wave and the triangle wave that you are seeing?

To see what is happening a bit more clearly, try using the stem function instead of plot.

stem(t,x);

HTH.