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## Re: Question About Plotting Trigonometric Functions

**From**: |
Ben Abbott |

**Subject**: |
Re: Question About Plotting Trigonometric Functions |

**Date**: |
Mon, 24 Dec 2007 11:11:59 +0800 |

`The period of your sine wave is 1/400 = 0.0025, while the distance
``between time indices is 0.1 (40 cycles). Each sample is very a
``multiple of a cycle. Thus, you are evaluating sin(2*pi*N) for N = 0,
``40, 80, 120, 160, 200. Each of these should ideally give a result of
``zero. Your result is within expected numerical precision.
`
To obtain a more representative plot of the sine wave, try
f = 400;
t = (0:0.01:1.0)/f;
plot (t, sin (2*pi*f*t))
Ben
On Dec 24, 2007, at 7:10 AM, Malstygian wrote:

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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