I would like to alter a signal that is about a couple thousand samples long to alter using matlab. any suggestions which signal i should use?

 

Isn't this related to this thread? - http://forum.allaboutcircuits.com/showthread.php?p=361931#post361931

 

yeah it is its because i didn't want to go off topic with programming and signals so i posted two posts in separate forums associated with the topics

 

You can make the signal as complicated or as simple as you wish.

A good start would be a pure sinusoid of known amplitude and frequency with superimposed random noise.