# Matlab. How to get the sine wave frequency and the sampling frequency of a sine wave.

Discussion in 'Homework Help' started by electrogirl, Aug 14, 2010.

1. ### electrogirl Thread Starter Member

May 2, 2010
47
0
Define the variables given below and plot the graph using the stem command.
T = 0:0.2:20;
A = 5sin(T);

get the amplitude, sine wave frequency and the sampling frequency of the graph.

this is how I wrote the code in Matlab:
T = 0:0.2:20;
A = 5*sin(T);
stem(T,A)
so, this is our first experiment in our laboratory class in signal processing our lab is ahead compared to our lecture class thats why I still don't know how to deal with this stuffs.
I know that the amplitude is 5. How to get the sine wave frequency and the sampling frequency?

(see attachment for the graph)

• ###### stem.png
File size:
15.1 KB
Views:
77
Last edited: Aug 15, 2010

May 2, 2010
47
0

3. ### mik3 Senior Member

Feb 4, 2008
4,846
63
The sinewave frequency is the inverse of the time of a full cycle.

The sampling frequency is the inverse of the time between two samples.

4. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
Was the above reply satisfactory or you want to calculate these quantities automaticaly through Matlab?