Could anyone kindly explain how to find a peak value for signal processing?

I am using GUI and trying to produce results using it. However i cannot get the desired peak value as the formulas i used all did not seem to help. I am doing signal processing and could anyone kindly explain to me how do i attain a peak value?

[Amith Kamath]

I would suggest you go through http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer. I'm sure it would be easier for attracting an answer with that!