Re: Question About Plotting Trigonometric Functions

[Doug Stewart]

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 
>   
You have asked for 6 points that are spaced apart by .1 of a second of a 
sine wave that osculates at 400 times a second
you need more points over a shorter time period.
the period of your sine wave is 1/400  of a second
f=400
t= 0 : (1/f)/20 : 1/f *5     this  will give you 20 data points per sine 
wave for a total of 5 sine waves